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Artykuły w czasopismach na temat „Exoplanets”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Montemor, Ryan Nepomuceno, and Ricardo Roberto Plaza Teixceira. "Atividades de divulgação científica sobre exoplanetas." Revista Brasileira de Educação em Ciências e Educação Matemática 5, no. 2 (2021): 445–60. http://dx.doi.org/10.33238/rebecem.2021.v.5.n.2.26865.

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Resumo: Este trabalho investigou os resultados e impactos de atividades de divulgação científica sobre a ciência dos exoplanetas, ocorridas em 2018, junto a alunos de quatro escolas de educação básica situadas em municípios do litoral norte paulista. Essas ações permitiram que os alunos adquirissem melhor compreensão acerca dos conceitos apresentados sobre exoplanetas e procuraram incentivar o aprofundamento no estudo de áreas da astronomia. Para a elaboração das apresentações estudou-se tanto o estado atual dos conhecimentos científicos sobre exoplanetas, quanto o modo como o trabalho didátic

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Varela, J., V. Réville, A. S. Brun, P. Zarka, and F. Pantellini. "Effect of the exoplanet magnetic field topology on its magnetospheric radio emission." Astronomy & Astrophysics 616 (August 2018): A182. http://dx.doi.org/10.1051/0004-6361/201732091.

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Context. The magnetized wind from stars that impact exoplanets should lead to radio emissions. According to the scaling laws derived in the solar system, the radio emission should depend on the stellar wind, interplanetary magnetic field, and topology of the exoplanet magnetosphere. Aims. The aim of this study is to calculate the dissipated power and subsequent radio emission from exoplanet magnetospheres with different topologies perturbed by the interplanetary magnetic field and stellar wind, to refine the predictions from scaling laws, and to prepare the interpretation of future radio detec

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Rodríguez-Mozos, J. M., and A. Moya. "Characterizing Exoplanets for Assessing Their Potential Habitability." Astrophysical Journal 987, no. 1 (2025): 85. https://doi.org/10.3847/1538-4357/adddbf.

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Abstract The Statistical-likelihood Exoplanetary Habitability Index (SEPHI) serves as a valuable tool for prioritizing targets for further study and identifying potentially habitable environments. In this paper, we present SEPHI 2.0, which incorporates several key improvements: (1) updated methods for estimating exoplanet internal structures and magnetic fields; (2) the inclusion of orbital eccentricity in assessing the potential for liquid water on an exoplanet’s surface; and (3) a new exoplanet mass–radius relationship. SEPHI 2.0 retains its probabilistic framework and combines the different

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4

Li, Megan G., Sofia Z. Sheikh, Christian Gilbertson, et al. "Developing a Drift Rate Distribution for Technosignature Searches of Exoplanets." Astronomical Journal 166, no. 5 (2023): 182. http://dx.doi.org/10.3847/1538-3881/acf83d.

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Abstract A stable-frequency transmitter with relative radial acceleration to a receiver will show a change in received frequency over time, known as a “drift rate.” For a transmission from an exoplanet, we must account for multiple components of drift rate: the exoplanet’s orbit and rotation, the Earth’s orbit and rotation, and other contributions. Understanding the drift rate distribution produced by exoplanets relative to Earth, can (a) help us constrain the range of drift rates to check in a Search for Extraterrestrial Intelligence project to detect radio technosignatures, and (b) help us d

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5

Wang, Zhixin. "Extrasolar Planet Candidates Identified by Single Transit from TESS." Journal of Physics: Conference Series 2441, no. 1 (2023): 012030. http://dx.doi.org/10.1088/1742-6596/2441/1/012030.

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Abstract The discovery of planets around stars other than Sun was a grand milestone to understand origin and evolution of life in Universe. 2019 Nobel Prize for Physics was awarded to the first discovery of exoplanet around Sun-like stars, Peg 51b, in 1995. With development of 25 years, the current number of confirmed exoplanets have reached 4,000. The population of exoplanets presents great diversity and complexity beyond the planets in Solar system, severely challenging our understanding on the origin and evolution of planets. Moreover, clues of extrasolar life have been partially disclosed

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Benito, María, Konstantin Karchev, Rebecca K. Leane, Sven Põder, Juri Smirnov, and Roberto Trotta. "Dark Matter halo parameters from overheated exoplanets via Bayesian hierarchical inference." Journal of Cosmology and Astroparticle Physics 2024, no. 07 (2024): 038. http://dx.doi.org/10.1088/1475-7516/2024/07/038.

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Abstract Dark Matter (DM) can become captured, deposit annihilation energy, and hence increase the heat flow in exoplanets and brown dwarfs. Detecting such a DM-induced heating in a population of exoplanets in the inner kpc of the Milky Way thus provides potential sensitivity to the galactic DM halo parameters. We develop a Bayesian Hierarchical Model to investigate the feasibility of DM discovery with exoplanets and examine future prospects to recover the spatial distribution of DM in the Milky Way. We reconstruct from mock exoplanet datasets observable parameters such as exoplanet age, tempe

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Ulmer-Moll, S., N. C. Santos, P. Figueira, J. Brinchmann, and J. P. Faria. "Beyond the exoplanet mass-radius relation." Astronomy & Astrophysics 630 (October 2019): A135. http://dx.doi.org/10.1051/0004-6361/201936049.

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Context. Mass and radius are two fundamental properties for characterising exoplanets, but only for a relatively small fraction of exoplanets are they both available. Mass is often derived from radial velocity measurements, while the radius is almost always measured using the transit method. For a large number of exoplanets, either the radius or the mass is unknown, while the host star has been characterised. Several mass-radius relations that are dependent on the planet’s type have been published that often allow us to predict the radius. The same is true for a bayesian code, which forecasts

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8

Yang, Gilbert. "Detection of Exoplanets based on the Transit Method." Highlights in Science, Engineering and Technology 31 (February 10, 2023): 196–203. http://dx.doi.org/10.54097/hset.v31i.5140.

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Exoplanets are planets orbiting a star other than the Sun. These exoplanets may exist in many different forms, such as a hot Jupiter and super earth. Detecting is the first step to further studying the properties of these exoplanets. In this paper, based on data of star Qatar-1 gathered from July 22nd 2022, a light flux curve is developed during the period of 04:28 - 07:01 UTC through which the star is observed. The presence of an exoplanet, presumably Qatar-1b, is revealed in the analyzing results of the collected data, showing the validity of the transit approach for exoplanet detection. By

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9

Liu, Christina X., and Jonathan H. Jiang. "Revisiting Seager’s 2013 Habitability Diagram with 2025 Data." Research Notes of the AAS 9, no. 5 (2025): 109. https://doi.org/10.3847/2515-5172/add46f.

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Abstract In a 2013 review, S. Seager presented a summary of known exoplanets and discussed habitability within the classic habitable zone (HZ) framework. We extended Seager’s work by incorporating a much larger and more current dataset of 5834 confirmed exoplanets from the NASA Exoplanet Archive. We then further highlighted exoplanet types (Terrestrial, Super-Earth, Neptune-Like, Gas-Giant), scaled data points by planet size, and calculated inner and outer HZ boundaries with a simplified greenhouse-based temperature model. Our updated figure illustrates the distribution of exoplanets relative

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10

Gupta, Richa, and Sidratul Muntaha. "Identifying Potentially Habitable Exoplanets: A Study using the Transit Method and Kepler dataset." Applied and Computational Engineering 8, no. 1 (2023): 93–97. http://dx.doi.org/10.54254/2755-2721/8/20230089.

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An exoplanet is a planet that orbits a star outside of our solar system. The study of exoplanets is an active area of research in astronomy. In this research, we aim to utilize the Kepler dataset provided by NASA EXOPLANET ACRCHIEVE to identify and classify exoplanets that could potentially support life. The Kepler dataset, which comprises of observations of over 150,000 stars, has been instrumental in the discovery of thousands of exoplanets. We will analyse the dataset using machine learning techniques to classify exoplanets as potentially habitable based on their orbital period, size, dista

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11

Ashtari, Reza, Anthony Sciola, Jake D. Turner, and Kevin Stevenson. "Detecting Magnetospheric Radio Emission from Giant Exoplanets." Astrophysical Journal 939, no. 1 (2022): 24. http://dx.doi.org/10.3847/1538-4357/ac92f5.

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Abstract As radio astronomy enters a golden age, ground-based observatories are reaching sensitivities capable of unlocking a new and exciting field of exoplanet observation. Radio observation of planetary auroral emission provides unique and complementary insight into planetary science not available via orthodox exoplanet observation techniques. Supplying the first measurements of planetary magnetic fields, rotation rates, and orbital obliquities, we gain necessary and crucial insight into our understanding of the star–planet relationships, geophysics, composition, and habitability of exoplan

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12

Sokoloff, Dmitry, Helmi Malova, and Egor Yushkov. "Symmetries of Magnetic Fields Driven by Spherical Dynamos of Exoplanets and Their Host Stars." Symmetry 12, no. 12 (2020): 2085. http://dx.doi.org/10.3390/sym12122085.

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Observations of exoplanets open a new area of scientific activity and the structure of exoplanet magnetospheres is an important part of this area. Here we use symmetry arguments and experiences in spherical dynamo modeling to obtain the set of possible magnetic configurations for exoplanets and their corresponding host stars. The main part of our results is that the possible choice is much richer than the basic dipole magnetic field of both exoplanets and stars. Other options, for example, are quadrupole configurations or mixed parity solutions. Expected configurations of current sheets for th

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13

Ligi, Roxanne, Denis Mourard, Karine Perraut, et al. "Modeling transiting exoplanet and spots For interferometric study." Proceedings of the International Astronomical Union 9, S302 (2013): 202–5. http://dx.doi.org/10.1017/s1743921314002087.

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AbstractUp to now, many techniques have been developed to detect and observe exoplanets, the radial velocity (RV) method being the most prolific one. However, stellar magnetic spots can mimic an exoplanet transit signal and lead to a false detection. A few models have already been developed to constrain the different signature of exoplanets and spots, but they only concern RV measurements or photometry. An interferometric approach, with high angular resolution capabilities, could resolve this problem.Optical interferometry is a powerful method to measure accurate stellar diameters, and derive

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14

Huang, Xinyue, Yuhan Yan, Shuangyu Yang, and Meng Yuan. "Discovering exoplanets in Pleiades with transiting exoplanet survey satellite." Theoretical and Natural Science 5, no. 1 (2023): 532–39. http://dx.doi.org/10.54254/2753-8818/5/20230323.

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No transiting exoplanets have previously been found in the Pleiades. The Pleiades is a relatively young star cluster near us, which makes it valuable for investigation. This study aims to determine the existence of exoplanets in Pleiades using the transit method. Specifically, it sought to determine if the listed 83 stars have exoplanets by inspecting on light-curves from data of Transiting Exoplanet Survey Satellite (TESS). The TESS mission, with a better resolution and observed sky area than the previous Kepler mission, aimed to find more exoplanets around stars. To test the hypothesis that

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15

Bagheri, Fatemeh, Sedighe Sajadian, and Sohrab Rahvar. "Detection of exoplanet as a binary source of microlensing events in WFIRST survey." Monthly Notices of the Royal Astronomical Society 490, no. 2 (2019): 1581–87. http://dx.doi.org/10.1093/mnras/stz2682.

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ABSTRACT We investigate the possibility of exoplanet detection orbiting source stars in microlensing events through WFIRST observations. We perform a Monte Carlo simulation on the detection rate of exoplanets via microlensing, assuming that each source star has at least one exoplanet. The exoplanet can reflect part of the light from the parent star or emit internal thermal radiation. In this new detection channel, we use microlensing as an amplifier to magnify the reflection light from the planet. In the literature, this mode of detecting exoplanets has been investigated much less than the usu

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16

Buslaeva, Elza, and Elena Belenkaya. "Characteristics of Multiplanetary Systems with One Host Star." Earth and Planetary Science 3, no. 2 (2024): 1–13. http://dx.doi.org/10.36956/eps.v3i2.1025.

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The characteristics of 100 multiplanetary systems with single central stars of different spectral classes were examined. The data for these systems were taken from the NASA Exoplanet Archive. Among the systems, those were selected for which the exoplanet mass and radius were simultaneously known. For 293 planets from these systems masses, radii, orbital radii, orbital periods, and types of exoplanets were analyzed. It occurred that the rarest type in such systems were terrestrial planets and after them the gas giants. Most of the exoplanets belonged to the type of super-earths. The distributio

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17

Elamin, Elsiddig Mohamed Ali. "Identifying Habitable Exoplanets Using the Earth and ‎‎‎Cosmic Harmonic Factor." Hyperscience International Journals 3, no. 1 (2023): 1–4. http://dx.doi.org/10.55672/hij2023pp1-4.

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The search for habitable exoplanets has been an active area of research in astronomy for decades. In this study, we ‎sought to ‎identify exoplanets that may be suitable for life by comparing the resulting Planets to Star distance when ‎applying the Earth & ‎Cosmic Harmonic Factor for a sample of 5200 exoplanet candidates identified by NASA to ‎that of Earth. After analyzing the ‎data, we identified 5 exoplanets that had the Earth & Cosmic Harmonic Factor ‎ratios within a range similar to that of Earth. ‎Our findings suggest that these exoplanets may have conditions ‎suitable for life a

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18

Jin, Yucheng, Lanyi Yang, and Chia-En Chiang. "Exoplanets Identification and Clustering with Machine Learning Methods." Machine Learning and Applications: An International Journal 9, no. 1 (2022): 1–14. http://dx.doi.org/10.5121/mlaij.2022.9101.

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The discovery of habitable exoplanets has long been a heated topic in astronomy. Traditional methods for exoplanet identification include the wobble method, direct imaging, gravitational microlensing, etc., which not only require a considerable investment of manpower, time, and money, but also are limited by the performance of astronomical telescopes. In this study, we proposed the idea of using machine learning methods to identify exoplanets. We used the Kepler dataset collected by NASA from the Kepler Space Observatory to conduct supervised learning, which predicts the existence of exoplanet

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Chen, Wenda. "The Comparison of Five Methods of Detecting Exoplanets." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 235–44. http://dx.doi.org/10.54097/hset.v38i.5812.

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Detecting exoplanets has become a hot topic, where various detection scenarios have been proposed. Five of these methods have all found more than 50 exoplanets, which are the transit method, the radial velocity method, the microlensing method, the imaging method, and the timing method. This paper aims to find their pros and cons, and the type of exoplanet that is suitable for each method by comparing the characteristics of exoplanets found by each method and the detection result of each method. The transit method is suitable for exoplanets with short periods possessing the advantages of measur

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Tsurikov, G. N., and D. V. Bisikalo. "NO BIOMARKER: TRANSMISSION AND EMISSION METHODS FOR ITS POTENTIAL DETECTION IN EXOPLANET ATMOSPHERES WITH SPEKTR-UF (WSO-UV)." Астрономический журнал 100, no. 11 (2023): 987–1004. http://dx.doi.org/10.31857/s0004629923110105.

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Among all habitability factors for terrestrial exoplanets, one of the most important is the presence of a secondary N2–O2 dominant atmosphere in an exoplanet. This factor can potentially indicate the already existing geological and biological processes on the exoplanet. Meanwhile, direct characterization of the N2–O2 atmospheres of terrestrial exoplanets is a difficult observational task. There are only a few indicators (molecules) of such an atmosphere, among which one can single out a potential biomarker – a molecule of nitric oxide NO. The strongest spectral features of this molecule in the

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Ballmer, Maxim D., and Lena Noack. "The Diversity of Exoplanets: From Interior Dynamics to Surface Expressions." Elements 17, no. 4 (2021): 245–50. http://dx.doi.org/10.2138/gselements.17.4.245.

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The coupled interior–atmosphere system of terrestrial exoplanets remains poorly understood. Exoplanets show a wide variety of sizes, densities, surface temperatures, and interior structures, with important knock-on effects for this coupled system. Many exoplanets are predicted to have a “stagnant lid” at the surface, with a rigid stationary crust, sluggish mantle convection, and only minor volcanism. However, if exoplanets have Earth-like plate tectonics, which involves several discrete, slowly moving plates and vigorous tectono-magmatic activity, then this may be critical for planetary habita

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Tolasa, Diriba, and Adugna Furi. "Exoplanets and Their Characterization in the Environment of Galaxy Formation." American Journal of Astronomy and Astrophysics 12, no. 1 (2025): 21–27. https://doi.org/10.11648/j.ajaa.20251201.13.

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The exploration of exoplanets has become a crucial domain in astrophysics, particularly in understanding their formation and evolution within the broader framework of galaxy formation. This paper offers a comprehensive analysis of the current methodologies employed for exoplanet detection and characterization, highlighting the intricate relationships between galactic dynamics and planetary systems. We introduce an innovative approach that integrates numerical simulations with analytical models to investigate how various galactic environments influence the properties of exoplanets. Our findings

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Jiang, Jonathan H., and Jadon Lam. "Exoplanet Harmony: Confirming Kepler’s Third Law with Kepler and TESS Discoveries." Research Notes of the AAS 8, no. 8 (2024): 215. http://dx.doi.org/10.3847/2515-5172/ad74d9.

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Abstract We investigate whether the orbital periods of exoplanets discovered by the Kepler and TESS missions adhere to Kepler’s Third Law, akin to the planets in our solar system. Using data obtained from the NASA Exoplanet Archive (DOI:10.26133/NEA12) on 2024 June 24, we analyzed 2659 Kepler observations and 415 TESS observations. Our results demonstrate that the exoplanets observed by both Kepler and TESS missions follow Kepler’s law, with deviations that are within the expected range of observational uncertainties. This confirms that Kepler’s Third Law holds true for exoplanets beyond our s

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Bernath, Peter F. "Molecular opacities for exoplanets." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2014 (2014): 20130087. http://dx.doi.org/10.1098/rsta.2013.0087.

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Spectroscopic observations of exoplanets are now possible by transit methods and direct emission. Spectroscopic requirements for exoplanets are reviewed based on existing measurements and model predictions for hot Jupiters and super-Earths. Molecular opacities needed to simulate astronomical observations can be obtained from laboratory measurements, ab initio calculations or a combination of the two approaches. This discussion article focuses mainly on laboratory measurements of hot molecules as needed for exoplanet spectroscopy.

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Bjorkman, Karen S. "Polarimetry of Binary Stars and Exoplanets." Proceedings of the International Astronomical Union 7, S282 (2011): 173–80. http://dx.doi.org/10.1017/s1743921311027281.

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AbstractPolarimetry is a useful diagnostic of asymmetries in both circumstellar environments and binary star systems. Its sensitivity to asymmetries in systems means that it can help to uncover details about system orbital parameters, including providing information about the orbital inclination. Polarimetry can probe the circumstellar and/or circumbinary material as well. A number of significant results on binary systems have been produced by polarimetric studies. One might therefore expect that polarimetry could similarly play a useful role in studies of exoplanets, and a number of possible

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Putirka, Keith D., Caroline Dorn, Natalie R. Hinkel, and Cayman T. Unterborn. "Compositional Diversity of Rocky Exoplanets." Elements 17, no. 4 (2021): 235–40. http://dx.doi.org/10.2138/gselements.17.4.235.

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To test whether exoplanets are similar to Earth, knowledge of their host star composition is essential. Stellar elemental abundances and planetary orbital data show that of the ~5,000 known minerals, exoplanetary silicate mantles contain mostly olivine, orthopyroxene, and clinopyroxene, ± quartz and magnesiowüstite at the extremes, while wholly exotic mineralogies are unlikely. Understanding the geology of exoplanets requires a better marriage of geological insights to astronomical data. The study of exoplanets is like a mirror: it reflects our incomplete understanding of Earth and neighboring

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Konatham, Samuel, Javier Martin-Torres, and Maria-Paz Zorzano. "Atmospheric composition of exoplanets based on the thermal escape of gases and implications for habitability." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2241 (2020): 20200148. http://dx.doi.org/10.1098/rspa.2020.0148.

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The detection of habitable exoplanets is an exciting scientific and technical challenge. Owing to the current and most likely long-lasting impossibility of performing in situ exploration of exoplanets, their study and hypotheses regarding their capability to host life will be based on the restricted low-resolution spatial and spectral information of their atmospheres. On the other hand, with the advent of the upcoming exoplanet survey missions and technological improvements, there is a need for preliminary discrimination that can prioritize potential candidates within the fast-growing list of

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Biller, Beth. "Detecting and Characterizing Exoplanets with Direct Imaging: Past, Present, and Future." Proceedings of the International Astronomical Union 8, S299 (2013): 1–11. http://dx.doi.org/10.1017/s1743921313007667.

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AbstractThe last decade has yielded the first images of exoplanets, considerably advancing our understanding of the properties of young giant planets. In this talk I will discuss current results from ongoing direct imaging efforts as well as future prospects for detection and characterization of exoplanets via high contrast imaging. Direct detection, and direct spectroscopy in particular, have great potential for advancing our understanding of extrasolar planets. In combination with other methods of planet detection, direct imaging and spectroscopy will allow us to eventually: 1) study the phy

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Kalra, Preeti, Abhendra PratapSingh, Arushi Gupt, Kartik Gupta, and Prachi Jindal. "A study on unveiling the secrets of exoplanet hunting." International Journal of Research in Engineering and Innovation 08, no. 01 (2024): 10–15. http://dx.doi.org/10.36037/ijrei.2024.8102.

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Exoplanets are celestial bodies outside our solar system, orbiting stars other than our sun. They come in various sizes, compositions, and distances from their host stars. Scientists detect exoplanets by observing the dimming of a star's light as a planet passes in front of it (transit method), measuring the gravitational tug a planet exerts on its star (radial velocity method), or directly capturing their images. Studying exoplanets is a captivating area of astronomy that unveils our universe's vast array of planetary systems. Researchers delve into these distant worlds to explore their atmos

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Wang, Junyi. "Exoplanet Radio Emission Detection: Principles and Approaches." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 77–82. http://dx.doi.org/10.54097/bcphhk88.

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Radio astronomy has emerged as a promising avenue for the detection and characterization of exoplanets, offering unique insights into the physical and atmospheric properties of these distant celestial bodies. This study commences with a historical overview of the early works by Zarka that laid the groundwork for the systematic exploration of radio exoplanet detection. It analyzes the theoretical principles and mechanisms that underpin the generation of radio emissions from exoplanetary systems. Detailed analysis delves into the specific instrumental capabilities of LOFAR, nenuFAR, and FAST, el

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Vannah, Sara, Ian D. Stiehl, and Marcelo Gleiser. "An Informational–Entropic Approach to Exoplanet Characterization." Entropy 27, no. 4 (2025): 385. https://doi.org/10.3390/e27040385.

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In the past, measures of the “Earth-likeness” of exoplanets have been qualitative, considering an abiotic Earth, or requiring discretionary choices of what parameters make a planet Earth-like. With the advent of high-resolution exoplanet spectroscopy, there is a growing need for a method of quantifying the Earth-likeness of a planet that addresses these issues while making use of the data available from modern telescope missions. In this work, we introduce an informational–entropic metric that makes use of the spectrum of an exoplanet to directly quantify how Earth-like the planet is. To illus

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Route, Matthew. "ROME. IV. An Arecibo Search for Substellar Magnetospheric Radio Emissions in Purported Exoplanet-hosting Systems at 5 GHz." Astrophysical Journal 966, no. 1 (2024): 55. http://dx.doi.org/10.3847/1538-4357/ad30ff.

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Abstract Plasma flow–obstacle interactions, such as those between an exoplanet’s magnetosphere and the host star’s stellar wind, may lead to detectable radio emissions. Despite many attempts to detect magnetospheric (auroral) radio emissions from exoplanets, a reproducible, unambiguous detection remains elusive. This fourth paper of the Radio Observations of Magnetized Exoplanets (ROME) series presents the results of a targeted radio survey of nine nearby systems that host exoplanet, brown dwarf, or low-mass-stellar companions conducted with the Arecibo radio telescope at ∼5 GHz. This search f

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Lee, Changseok. "Habitability of an exoplanet based on stellar wind." Theoretical and Natural Science 43, no. 1 (2024): 45–49. http://dx.doi.org/10.54254/2753-8818/43/20241135.

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This paper aims to investigate the influence of stellar winds on the atmosphere of exoplanets. Stellar winds, which consist of charged particles produced by stars, can heavily alter and affect the evolution and composition of exoplanet atmospheres. This paper will provide an overview of stellar wind characteristics and their interactions with exoplanets. It will also investigate the consequences of such interactions, such as atmospheric erosion, atmospheric escape, and the exoplanets habitability. In order to develop a more sophisticated and accurate method for identifying habitable planets th

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Jharbade, Nitika. "Detecting Exoplanets with Radial Velocity and Transit Methods: A Comparative Analysis." International Journal of Recent Advances in Multidisciplinary Topics 5, no. 6 (2024): 13–15. https://doi.org/10.5281/zenodo.11530236.

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This paper presents a comprehensive comparative analysis of two prominent methods for detecting exoplanets: the Radial Velocity (RV) method and the Transit Photometry method. These methods have significantly contributed to the discovery and characterization of exoplanets, expanding our understanding of planetary systems beyond our own. This study examines the principles, advantages, limitations, and notable discoveries associated with each method. It also discusses the technological advancements and future prospects in exoplanet detection.

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Faedi, Francesca, Susana C. C. Barros, Don Pollacco, et al. "New transiting exoplanets from the SuperWASP-North survey." Proceedings of the International Astronomical Union 6, S276 (2010): 143–47. http://dx.doi.org/10.1017/s1743921311020084.

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AbstractThe Wide Angle Search for Planet (WASP) project is one of the leading projects in the discovery of transiting exoplanets. We present 1) the current status of the WASP-North survey, 2) our recent exoplanet discoveries, and 3) we exemplify how these results fit into our understanding of transiting exoplanet properties and how they can help to understand exoplanet diversity.

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36

Green, D. A., and N. Madhusudhan. "Search for radio emission from the exoplanets Qatar-1b and WASP-80b near 150 MHz using the giant metrewave radio telescope." Monthly Notices of the Royal Astronomical Society 500, no. 1 (2020): 211–14. http://dx.doi.org/10.1093/mnras/staa3208.

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ABSTRACT We present radio observations made towards the exoplanets Qatar-1b and WASP-80b near 150 MHz with the Giant Meterwave Radio Telescope (GMRT). These targets are relatively nearby irradiated giant exoplanets, a hot Jupiter and a hot Saturn, with sizes comparable to Jupiter but different masses and lower densities. Both the targets are expected to host extended H/He envelopes like Jupiter, with comparable or larger magnetic moments. No radio emission was detected from these exoplanets, with 3σ limits of 5.9 and 5.2 mJy for Qatar-1b and WASP-80b, respectively, from these targeted observat

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37

Komacek, Thaddeus D., Wanying Kang, Jacob Lustig-Yaeger, and Stephanie L. Olson. "Constraining the Climates of Rocky Exoplanets." Elements 17, no. 4 (2021): 251–56. http://dx.doi.org/10.2138/gselements.17.4.251.

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Numerical climate models originally developed for Earth have been adapted to study exoplanetary climates. This is allowing us to investigate the range of properties that might affect an exoplanet’s climate. The recent discovery, and upcoming characterization, of cosmically close rocky exoplanets opens the door toward understanding the processes that shape planetary climates, maybe also leading to insight into the persistent habitability of Earth itself. We summarize the recent advances made in understanding the climate of rocky exoplanets, including their atmospheric structure, chemistry, evol

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Piette, Anjali A. A., Nikku Madhusudhan, and Avi M. Mandell. "HyDRo: atmospheric retrieval of rocky exoplanets in thermal emission." Monthly Notices of the Royal Astronomical Society 511, no. 2 (2021): 2565–84. http://dx.doi.org/10.1093/mnras/stab3612.

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ABSTRACT Emission spectroscopy is a promising technique to observe atmospheres of rocky exoplanets, probing both their chemistry and thermal profiles. We present hydro, an atmospheric retrieval framework for thermal emission spectra of rocky exoplanets. hydro does not make prior assumptions about the background atmospheric composition, and can therefore be used to interpret spectra of secondary atmospheres with unknown compositions. We use hydro to assess the chemical constraints which can be placed on rocky exoplanet atmospheres using JWST. First, we identify the best currently known rocky ex

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Oelkers, Ryan J., Luke M. Schmidt, Erika Cook, et al. "Ground-based Reconnaissance Observations of 21 Exoplanet Atmospheres with the Exoplanet Transmission Spectroscopy Imager." Astronomical Journal 169, no. 3 (2025): 134. https://doi.org/10.3847/1538-3881/ada557.

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Abstract One of the most prolific methods of studying exoplanet atmospheres is transmission spectroscopy, which measures the difference between the depth of an exoplanet's transit signal at various wavelengths and attempts to correlate the depth changes to potential features in the exoplanet's atmosphere. Here we present reconnaissance observations of 21 exoplanet atmospheres measured with the Exoplanet Transmission Spectroscopy Imager (ETSI), a recently deployed spectrophotometer on the McDonald Observatory Otto Struve 2.1 m telescope. ETSI measurements are mostly free of systematics through

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Akilah, Rafa Nanda, Bryant Randolph, and M. Khawariz Andaristiyan. "Exomod: A Python Library for Exoplanet Transit Light Curve Fitting and Stacking with Background Simulation and Optimization." Journal of Physics: Conference Series 2866, no. 1 (2024): 012064. http://dx.doi.org/10.1088/1742-6596/2866/1/012064.

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Abstract From the light curve taken during exoplanet transit, important parameters such as the radius ratio of the star-planet, impact parameter, inclination, and relative tangential velocity could be derived. A module was developed in the form of a Python library based on modeling using background simulation and fitting by utilizing global and local optimization, such as differential evolution and the Broyden–Fletcher–Goldfarb–Shanno (BFGS) method. For more accurate fitting, the effects of linear limb darkening on exoplanets are also included. The performance testing for the program was done

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41

Simpson, Emilie R., Tara Fetherolf, Stephen R. Kane, Joshua Pepper, Teo Močnik, and Paul A. Dalba. "Variability of Known Exoplanet Host Stars Observed by TESS." Astronomical Journal 166, no. 2 (2023): 72. http://dx.doi.org/10.3847/1538-3881/acda26.

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Abstract Both direct and indirect methods of exoplanet detection rely upon detailed knowledge of the potential host stars. Such stellar characterization allows for accurate extraction of planetary properties, as well as contributing to our overall understanding of exoplanetary system architecture. In this analysis, we examine the photometry of 264 known exoplanet host stars (harboring 337 planetary companions) that were observed during the Transiting Exoplanet Survey Satellite (TESS) Prime Mission. We identify periodic signatures in the lightcurves of these stars and make possible connections

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42

Bennett, David P., Clément Ranc, and Rachel B. Fernandes. "No Sub-Saturn-mass Planet Desert in the CORALIE/HARPS Radial-velocity Sample." Astronomical Journal 162, no. 6 (2021): 243. http://dx.doi.org/10.3847/1538-3881/ac2a2b.

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Abstract We analyze the CORALIE/HARPS sample of exoplanets found by the Doppler radial-velocity method for signs of the predicted gap or “desert” at 10–100 M ⊕ caused by runaway gas accretion at semimajor axes of <3 au. We find that these data are not consistent with this prediction. This result is similar to the finding by the MOA gravitational microlensing survey that found no desert in the exoplanet distribution for exoplanets in slightly longer period orbits and somewhat lower host masses (Suzuki et al. 2018). Together, these results imply that the runaway gas accretion scenario of the

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Rodríguez-Mozos, J. M., and A. Moya. "Erosion of an exoplanetary atmosphere caused by stellar winds." Astronomy & Astrophysics 630 (September 23, 2019): A52. http://dx.doi.org/10.1051/0004-6361/201935543.

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Aims. We present a formalism for a first-order estimation of the magnetosphere radius of exoplanets orbiting stars in the range from 0.08 to 1.3 M⊙. With this radius, we estimate the atmospheric surface that is not protected from stellar winds. We have analyzed this unprotected surface for the most extreme environment for exoplanets: GKM-type and very low-mass stars at the two limits of the habitable zone. The estimated unprotected surface makes it possible to define a likelihood for an exoplanet to retain its atmosphere. This function can be incorporated into the new habitability index SEPHI.

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Mistry, Priyashkumar, Kamlesh Pathak, Aniket Prasad, et al. "VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars." Astronomical Journal 166, no. 1 (2023): 9. http://dx.doi.org/10.3847/1538-3881/acd548.

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Abstract NASA’s Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission designed to find transiting exoplanets orbiting nearby bright stars. It has identified more than 329 transiting exoplanets, and almost 6000 candidates remain unvalidated. In this manuscript, we discuss the findings from the ongoing Validation of Transiting Exoplanets using Statistical Tools (VaTEST) project, which aims to validate new exoplanets for further characterization. We validated 11 new exoplanets by examining the light curves of 24 candidates using the LATTE and TESS-Plot tools and computing the

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Li, Jiazheng, Jonathan H. Jiang, Huanzhou Yang, et al. "Rotation Period Detection for Earth-like Exoplanets." Astronomical Journal 163, no. 1 (2021): 27. http://dx.doi.org/10.3847/1538-3881/ac36ce.

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Abstract A terrestrial planet’s rotation period is one of the key parameters that determines its climate and habitability. Current methods for detecting the rotation period of exoplanets are not suitable for terrestrial exoplanets. Here we demonstrate that, under certain conditions, the rotation period of an Earth-like exoplanet will be detectable using direct-imaging techniques. We use a global climate model that includes clouds to simulate reflected starlight from an Earth-like exoplanet and explore how different parameters (e.g., orbital geometry, wavelength, time resolution) influence the

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46

Jiang, Jonathan, Daniel Zhao, Xuan Ji, Bohan Xie, and Kristen Fahy. "Revisiting the Planet Mass and Stellar Metallicity Relation for Low-Mass Exoplanets Orbiting GKM Class Stars." Universe 7, no. 4 (2021): 88. http://dx.doi.org/10.3390/universe7040088.

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The growing database of exoplanets has shown us the statistical characteristics of various exoplanet populations, providing insight towards their origins. Observational evidence suggests that the process by which gas giants are conceived in the stellar disk may be disparate from that of smaller planets. Using NASA’s Exoplanet Archive, we analyzed the relationships between planet mass and stellar metallicity, as well as planet mass and stellar mass for low-mass exoplanets (MP < 0.13 MJ) orbiting spectral class G, K, and M stars. We performed further uncertainty analysis to confirm that the e

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Hu, Xiaojun, Zhixian Ye, Fangjie Xi, Xian Li, and Ronald Rousseau. "Research on exoplanets : A bibliometric study of a new research frontier." COLLNET Journal of Scientometrics and Information Management 18, no. 2 (2024): 137–54. https://doi.org/10.47974/cjsim-2023-0021.

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We conduct a systematic analysis of scientific publications in the new research frontier dealing with exoplanets. Our main methodology is Latent Dirichlet allocation (LDA) used to identify latent themes diachronically. In this way, we identify top themes, their trends, and leading journals. Moreover, co-occurrence networks of country-country collaboration and institution-institution collaboration are drawn. In this way, we determine the scientific frontiers of exoplanet studies, and themes that received the most citations were found. The size of research teams, as shown by co-authors per artic

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Owen, James E. "Atmospheric Escape and the Evolution of Close-In Exoplanets." Annual Review of Earth and Planetary Sciences 47, no. 1 (2019): 67–90. http://dx.doi.org/10.1146/annurev-earth-053018-060246.

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Exoplanets with substantial hydrogen/helium atmospheres have been discovered in abundance, many residing extremely close to their parent stars. The extreme irradiation levels that these atmospheres experience cause them to undergo hydrodynamic atmospheric escape. Ongoing atmospheric escape has been observed to be occurring in a few nearby exoplanet systems through transit spectroscopy both for hot Jupiters and for lower-mass super-Earths and mini-Neptunes. Detailed hydrodynamic calculations that incorporate radiative transfer and ionization chemistry are now common in one-dimensional models, a

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Nagler, Peter C., Billy Edwards, Brian Kilpatrick, et al. "Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform." Journal of Astronomical Instrumentation 08, no. 03 (2019): 1950011. http://dx.doi.org/10.1142/s2251171719500119.

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Although there exists a large sample of known exoplanets, little data exists that can be used to study their global atmospheric properties. This deficiency can be addressed by performing phase-resolved spectroscopy — continuous spectroscopic observations of a planet’s entire orbit about its host star — of transiting exoplanets. Planets with characteristics suitable for atmospheric characterization have orbits of several days, thus phase curve observations are highly resource intensive, especially for shared use facilities. In this work, we show that an infrared spectrograph operating from a hi

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Otegi, J. F., F. Bouchy, and R. Helled. "Revisited mass-radius relations for exoplanets below 120 M⊕." Astronomy & Astrophysics 634 (February 2020): A43. http://dx.doi.org/10.1051/0004-6361/201936482.

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The masses and radii of exoplanets are fundamental quantities needed for their characterisation. Studying the different populations of exoplanets is important for understanding the demographics of the different planetary types, which can then be linked to planetary formation and evolution. We present an updated exoplanet catalogue based on reliable, robust, and, as much as possible accurate mass and radius measurements of transiting planets up to 120 M⊕. The resulting mass-radius (M-R) diagram shows two distinct populations, corresponding to rocky and volatile-rich exoplanets which overlap in

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