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Journal articles on the topic 'Sub-Solar mass search'

Author: Grafiati

Published: 18 May 2024

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1

Nunes, Rafael. "Search for Sub-Solar Mass Binaries with Einstein Telescope and Cosmic Explorer." Entropy 24, no. 2 (2022): 262. http://dx.doi.org/10.3390/e24020262.

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A possible detection of sub-solar mass ultra-compact objects would lead to new perspectives on the existence of black holes that are not of astrophysical origin and/or pertain to formation scenarios of exotic ultra-compact objects. Both possibilities open new perspectives for better understanding of our universe. In this work, we investigate the significance of detection of sub-solar mass binaries with components mass in the range: 10−2M⊙ up to 1M⊙, within the expected sensitivity of the ground-based gravitational waves detectors of third generation, viz., the Einstein Telescope (ET) and the C

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2

Gouliermis, Dimitrios, Alessandro Berton, Wolfgang Brandner, Thomas Henning, and Markus Feldt. "The search for the sub-solar initial mass function in the Local Group." Proceedings of the International Astronomical Union 1, S232 (2005): 261–64. http://dx.doi.org/10.1017/s1743921306000676.

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Garrett, M. A., S. Nair, R. W. Porcas, and A. R. Patnaik. "A Search for Dark Matter in the Halos of Lensing Galaxies using VLBI." Symposium - International Astronomical Union 173 (1996): 189–90. http://dx.doi.org/10.1017/s0074180900231264.

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Baryonic Dark Matter (BDM) candidates are segregated into two main mass ranges: (i) sub-solar mass dwarf stars (MACHOS) and (ii) ∼ 104–106M⊙ Very Massive Objects (VMOs). The lower mass range has been the target of the various micro-lensing programs but the first, tentative conclusions (see Stubbs et al. these proceedings) seem to suggest that MACHOs are unlikely to provide the bulk of the dark matter in the galactic halo. Meanwhile the upper mass range (104–106M⊙) remains largely unexplored. However, Wambsganss & Paczynski 1992 (hereafter WP92), have shown that this mass range is perfectly

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4

Lovis, C., M. Mayor, F. Bouchy, et al. "Towards the characterization of the hot Neptune/super-Earth population around nearby bright stars." Proceedings of the International Astronomical Union 4, S253 (2008): 502–5. http://dx.doi.org/10.1017/s1743921308027051.

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AbstractThe HARPS search for low-mass extrasolar planets has been ongoing for more than 4 years, targeting originally about 400 bright FGK dwarfs in the solar neighbourhood. The published low-mass planetary systems coming from this survey are fully confirmed by subsequent observations, which demonstrate the sub-m/s long-term stability reached by HARPS. The complex RV curves of these systems have led us to focus on a smaller sample of stars, accumulating more data points per star. We perform a global search in our data to assess the existence of the large population of ice giants and super-Eart

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Hobson, M. J., X. Delfosse, N. Astudillo-Defru, et al. "The SOPHIE search for northern extrasolar planets." Astronomy & Astrophysics 625 (May 2019): A18. http://dx.doi.org/10.1051/0004-6361/201834890.

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We present the detection of a warm Neptune orbiting the M dwarf Gl 378, using radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. The star was observed in the context of the SOPHIE exoplanet consortium’s sub-programme dedicated to finding planets around M dwarfs. Gl 378 is an M1 star, of solar metallicity, at a distance of 14.96 pc. The single planet detected, Gl 378 b, has a minimum mass of 13.02 MEarth and an orbital period of 3.82 days, which place it at the lower boundary of the hot Neptune desert. As one of only a few such planets arou

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Unger, N., D. Ségransan, D. Queloz, et al. "The HARPS search for southern extra-solar planets." Astronomy & Astrophysics 654 (October 2021): A104. http://dx.doi.org/10.1051/0004-6361/202141351.

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Context. We present precise radial-velocity measurements of five solar-type stars observed with the HARPS Echelle spectrograph mounted on the 3.6-m telescope in La Silla (ESO, Chile). With a time span of more than 10 yr and a fairly dense sampling, the survey is sensitive to low mass planets down to super-Earths on orbital periods up to 100 days. Aims. Our goal was to search for planetary companions around the stars HD 39194, HD 93385, HD 96700, HD 154088, and HD 189567 and use Bayesian model comparison to make an informed choice on the number of planets present in the systems based on the rad

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Klapdor-Kleingrothaus, H. V. "Perspectives of double beta and dark matter search as windows to new physics." HNPS Proceedings 9 (February 11, 2020): 130. http://dx.doi.org/10.12681/hnps.2779.

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Nuclear double beta decay provides an extraordinarily broad potential to search for beyond Standard Model physics, probing already now the TeV scale, on which new physics should manifest itself. These possibilities are reviewed here. First, the results of present generation experiments are presented. The most sensitive one of them - the Heidelberg-Moscow experiment in the Gran Sasso - probes the electron mass now in the sub eV region and has reached recently a limit of ~ 0.1 eV. This limit has striking influence on presently discussed neutrino mass scenarios. Basing to a large extent on the th

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Parise, Bérengère, Per Bergman, and Karl Menten. "Characterizing the chemical pathways for water formation – a deep search for hydrogen peroxide." Faraday Discuss. 168 (2014): 349–67. http://dx.doi.org/10.1039/c3fd00115f.

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In 2011, hydrogen peroxide (HOOH) was observed for the first time outside the solar system (Bergman et al., Astron. Astrophys., 2011, 531, L8). This detection appeared a posteriori to be quite natural, as HOOH is an intermediate product in the formation of water on the surface of dust grains. Following up on this detection, we present a search for HOOH in a diverse sample of sources in different environments, including low-mass protostars and regions with very high column densities, such as Infrared Dark Clouds (IRDCs). We do not detect the molecule in any other source than Oph A, and derive 3

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Udry, S., M. Mayor, and D. Queloz. "CORALIE–ELODIE new planets and planetary systems. Looking for fossil traces of formation and evolution." Symposium - International Astronomical Union 202 (2004): 12–19. http://dx.doi.org/10.1017/s0074180900217403.

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6 new extra-solar planet candidates (HD 6434 b, HD 19994 b, HD 83443c, HD 92788b, HD 121504b, HD 190228b) are announced as part of our planet-search programmes in the northern and southern hemispheres. HD 83443 c is member of a 2-planet system with Saturnian and sub-Saturnian masses. Another system including a planet + a very low-mass brown dwarf orbiting HD 168443 is also presented. These 2 new systems and the new planetary detections rise to 25 the number of ELODIE and CORALIE candidates with minimum masses ≤20MJup. The orbital element distributions of giant-planet candidates, like the secon

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10

Manchester, R. N. "The Ellery Lecture 1993: Pulsars—Setting the Standard." Publications of the Astronomical Society of Australia 11, no. 1 (1994): 1–6. http://dx.doi.org/10.1017/s1323358000019561.

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AbstractOver 600 pulsars are now known, almost all of which lie in our Galaxy. Most pulsars have periods between 0 · 1 and a few seconds, but a very important sub-class, the ‘millisecond’ pulsars, have much shorter periods. Millisecond pulsars are often in a binary orbit with another star, suggesting that their short periods are a result of accreting mass from the companion star. They are also extraordinarily good clocks, with a stability comparable to that of the best atomic clocks. This combination of extreme period stability and binary motion has led to some very important results, includin

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11

Pathak, P., D. J. M. Petit dit de la Roche, M. Kasper, et al. "High-contrast imaging at ten microns: A search for exoplanets around Eps Indi A, Eps Eri, Tau Ceti, Sirius A, and Sirius B." Astronomy & Astrophysics 652 (August 2021): A121. http://dx.doi.org/10.1051/0004-6361/202140529.

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Context. The direct imaging of rocky exoplanets is one of the major science goals of upcoming large telescopes. The contrast requirement for imaging such planets is challenging. However, the mid-IR (infrared) regime provides the optimum contrast to directly detect the thermal signatures of exoplanets in our solar neighbourhood. Aims. We aim to exploit novel fast-chopping techniques newly developed for astronomy with the aid of adaptive optics to look for thermal signatures of exoplanets around bright stars in the solar neighbourhood. Methods. We used the upgraded Very Large Telescope Imager an

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12

KLAPDOR-KLEINGROTHAUS, H. V. "STATUS AND PERSPECTIVES OF DOUBLE BETA DECAY — WINDOW TO NEW PHYSICS BEYOND THE STANDARD MODEL OF PARTICLE PHYSICS." International Journal of Modern Physics A 13, no. 23 (1998): 3953–92. http://dx.doi.org/10.1142/s0217751x98001852.

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Nuclear double beta decay provides an extraordinarily broad potential to search for beyond Standard Model physics, probing already now the TeV scale, on which new physics should manifest itself. These possibilities are reviewed here. First, the results of present generation experiments are presented. The most sensitive one of them — the Heidelberg–Moscow experiment in the Gran Sasso — probes the electron mass now in the sub eV region and will reach a limit of ~ 0.1 eV in a few years. Basing to a large extent on the theoretical work of the Heidelberg Double Beta Group in the last two years, res

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13

Lumbreras-Calle, A., C. Muñoz-Tuñón, J. Méndez-Abreu, et al. "Star-forming galaxies at low-redshift in the SHARDS survey." Astronomy & Astrophysics 621 (January 2019): A52. http://dx.doi.org/10.1051/0004-6361/201731670.

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Context. The physical processes driving the evolution of star formation (SF) in galaxies over cosmic time still present many open questions. Recent galaxy surveys allow now to study these processes in great detail at intermediate redshift (0 ≤ z ≤ 0.5). Aims. We build a complete sample of star-forming galaxies and analyze their properties, reaching systems with low stellar masses and low star formation rates (SFRs) at intermediate-to-low redshift. Methods. We use data from the SHARDS multiband survey in the GOODS-North field. Its depth (up to magnitude ⟨m3σ⟩~ 26.5) and its spectro-photometric

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14

Rainot, A., M. Reggiani, H. Sana, J. Bodensteiner, and O. Absil. "Carina High-contrast Imaging Project for massive Stars (CHIPS)." Astronomy & Astrophysics 658 (February 2022): A198. http://dx.doi.org/10.1051/0004-6361/202141562.

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Context. Most massive stars belong to multiple systems, yet the formation process leading to such high multiplicity remains insufficiently understood. To help constrain the different formation scenarios that exist, insights into the low-mass end of the companion mass function of such stars is crucial. However, this is a challenging endeavour as (sub-)solar mass companions at angular separations (ρ) below 1″ (corresponding to 1000–3000 au in nearby young open clusters and OB associations) are difficult to detect due to the large brightness contrast with the central star. Aims. With the Carina H

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15

Nelson, C. J., S. Krishna Prasad, and M. Mathioudakis. "Evolution of downflows in the transition region above a sunspot over short time-scales." Astronomy & Astrophysics 640 (August 2020): A120. http://dx.doi.org/10.1051/0004-6361/202038155.

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Context. Downflows with potentially super-sonic velocities have been reported to occur in the transition region above many sunspots; however, how these signatures evolve over short time-scales in both spatial and spectral terms is still unknown and requires further research. Aims. In this article, we investigate the evolution of downflows detected within spectral lines sampling the transition region on time-scales of the order of minutes and we search for clues as to the formation mechanisms of these features in co-temporal imaging data. Methods. For the purposes of this article, we used high-

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16

Bohn, A. J., J. Southworth, C. Ginski, M. A. Kenworthy, P. F. L. Maxted, and D. F. Evans. "A multiplicity study of transiting exoplanet host stars." Astronomy & Astrophysics 635 (March 2020): A73. http://dx.doi.org/10.1051/0004-6361/201937127.

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Context. Many main-sequence stars are part of multiple systems. The effect of stellar multiplicity on planet formation and migration, however, is poorly understood. Aims. We study the multiplicity of stars hosting known transiting extra-solar planets to test competing theories on the formation mechanisms of hot Jupiters. Methods. We observed 45 exoplanet host stars using the infrared dual imaging spectrograph of the Spectro-Polarimetric High-Contrast Exoplanet Research (SPHERE) instrument at the Very Large Telescope to search for potential companions. For each identified candidate companion we

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17

Drozdovskaya, Maria N., Laurent H. Coudert, Laurent Margulès, Audrey Coutens, Jes K. Jørgensen, and Sébastien Manigand. "Successive deuteration in low-mass star-forming regions: The case of D₂-methanol (CHD₂OH) in IRAS 16293-2422." Astronomy & Astrophysics 659 (March 2022): A69. http://dx.doi.org/10.1051/0004-6361/202142863.

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Context. Di-deuterated molecules are observed in the earliest stages of star formation at abundances of a few percent relative to their nondeuterated isotopologs, which is unexpected considering the scarcity of deuterium in the interstellar medium. With sensitive observations leading to the detection of a steadily increasing number of di-deuterated species, it is becoming possible to explore successive deuteration chains. Aims. The accurate quantification of the column density of di-deuterated methanol is a key piece of the puzzle that is missing in the otherwise thoroughly constrained family

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18

Gibbs, Aidan, and Michael P. Fitzgerald. "Limits on the Auroral Generation of H₃ ⁺ in Brown Dwarf and Extrasolar Giant Planet Atmospheres with the Keck Near Infrared Echelle Spectrograph." Astronomical Journal 164, no. 2 (2022): 63. http://dx.doi.org/10.3847/1538-3881/ac7718.

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Abstract The molecular ion H3 + is a potentially powerful tracer of the ionospheres and thermal structures of Jovian planets but has never been detected in a planetary mass object outside of the solar system. Models predict that H3 + emission driven by EUV flux and solar wind on hot Jupiters, or by powerful aurorae on brown dwarfs, will be between 102 and 105 × more intense than that of Jupiter. If optimal conditions for the production of emission do exist, the emission may be detectable by current ground-based instruments or in the near future. We present the first search for H3 + line emissi

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19

Saraiva, Samuel Vitor, Ricardo Ferreira Amorim, Frede Oliveira Carvalho, and Leonardo Domingues. "Prognóstico de Radiação Solar Através Modelos que Combinam as Técnicas Wavelet e Redes Neurais (Forecast of Solar Radiation Through Models that Combine the Wavelet and Neural Networks Techniques)." Revista Brasileira de Geografia Física 7, no. 5 (2015): 808. http://dx.doi.org/10.26848/rbgf.v7.5.p808-817.

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O prognostico de variáveis meteorológicas, como radiação solar, sempre foi de grande importância para a tomada de decisão em ocasião de ocorrências de eventos incomuns. Nesse contexto é justificável a busca por modelos matemáticos e estatísticos que produzam melhores prognósticos para tais variáveis. Desta forma investiga-se a estratégia de conjunção que se compõe de duas técnicas muito utilizadas no tratamento de série temporal; a transformada Wavelet que mostra analiticamente o sinal no domínio do tempo e da frequência; e as RNA’s a quais são modelos de inteligência artificial. A combinação

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20

Arik, M., S. Aune, K. Barth, et al. "Search for Sub-eV Mass Solar Axions by the CERN Axion Solar Telescope withHe3Buffer Gas." Physical Review Letters 107, no. 26 (2011). http://dx.doi.org/10.1103/physrevlett.107.261302.

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21

Álvarez Melcón, A., S. Arguedas Cuendis, J. Baier та ін. "First results of the CAST-RADES haloscope search for axions at 34.67 μeV". Journal of High Energy Physics 2021, № 10 (2021). http://dx.doi.org/10.1007/jhep10(2021)075.

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Abstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 μeV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of gaγ ≳ 4 × 10−13 GeV−1 over a mass range of 34.6738 μeV < ma< 34.6771 μeV is set. This constitutes a

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22

May Tzuc, Oscar, Jorge J. Chan-González, Iván E. Castañeda-Robles, et al. "Multivariate inverse artificial neural network to analyze and improve the mass transfer of ammonia in a Plate Heat Exchanger-Type Absorber with NH₃/H₂O for solar cooling applications." Energy Exploration & Exploitation, February 11, 2022, 014459872110731. http://dx.doi.org/10.1177/01445987211073175.

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This work presents a numerical approach to compute optimal operating conditions that maximize the absorption flux into a heat exchanger designed for absorption refrigeration systems. Experimental data were obtained from a test circuit that operates in bubble absorption mode with an inner vapor distributor into a Plate Heat Exchanger-type (PHE-type) and interacts with ammonia vapor, NH3-H2O refrigerant, and cooling water. An artificial neural network (ANN) was trained to correlate the thermal properties of the solution and absorption flux in function of easily measurable parameters (concentrati

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23

Hamedani Golshan, Roya, Peter Schilke, Marta Sewilo, Thomas Moller, V. S. Veena, and Gary A. Fuller. "High-mass star formation across the Large Magellanic Cloud. I. Chemical properties and hot molecular cores observed with ALMA at 1.2 mm." Astronomy & Astrophysics, May 7, 2024. http://dx.doi.org/10.1051/0004-6361/202349077.

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The formation of massive stars passes through a so-called hot molecular core phase, where the temperature of molecular gas and dust rises to above 100 K within a size scale of approximately 0.1 pc. The hot molecular cores are rich in chemical compounds found in the gas phase, which are a great probe of ongoing star formation. To study the impact of the initial effects of metallicity (i.e., the abundance of elements heavier than helium) on star formation and the formation of different molecular species, we searched for hot molecular cores in the sub-solar metallicity environment of the Large Ma

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24

Gulliver, Robyn. "Iconic 21st Century Activist "T-Shirt and Tote-Bag" Combination Is Hard to Miss These Days!" M/C Journal 25, no. 4 (2022). http://dx.doi.org/10.5204/mcj.2922.

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Introduction Fashion has long been associated with resistance movements across Asia and Australia, from the hand-spun cotton Khadi of Mahatma Gandhi’s freedom struggle to the traditional ankle length robe worn by Tibetans in the ‘White Wednesday Movement’ (Singh et al.; Yangzom). There are many reasons why fashion and activism have been interlinked. Fashion can serve as a form of nonverbal communication (Crane), which can convey activists’ grievances and concerns while symbolising solidarity (Doerr). It can provide an avenue to enact individual agency against repressive, authoritarian regimes

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