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Добірка наукової літератури з теми "Temperate rocky planets"

Автор: Grafiati

Опубліковано: 20 квітня 2024

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Статті в журналах з теми "Temperate rocky planets"

1

Unterborn, Cayman T., Bradford J. Foley, Steven J. Desch, et al. "Mantle Degassing Lifetimes through Galactic Time and the Maximum Age Stagnant-lid Rocky Exoplanets Can Support Temperate Climates." Astrophysical Journal Letters 930, no. 1 (2022): L6. http://dx.doi.org/10.3847/2041-8213/ac6596.

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Abstract The ideal exoplanets to search for life are those within a star’s habitable zone. However, even within the habitable zone, planets can still develop uninhabitable climate states. Sustaining a temperate climate over geologic (∼gigayear) timescales requires a planet to contain sufficient internal energy to power a planetary-scale carbon cycle. A major component of a rocky planet’s energy budget is the heat produced by the decay of radioactive elements, especially 40K, 232Th, 235U, and 238U. As the planet ages and these elements decay, this radiogenic energy source dwindles. Here we esti

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2

Dreizler, S., S. V. Jeffers, E. Rodríguez, et al. "RedDots: a temperate 1.5 Earth-mass planet candidate in a compact multiterrestrial planet system around GJ 1061." Monthly Notices of the Royal Astronomical Society 493, no. 1 (2020): 536–50. http://dx.doi.org/10.1093/mnras/staa248.

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ABSTRACT Small low-mass stars are favourable targets for the detection of rocky habitable planets. In particular, planetary systems in the solar neighbourhood are interesting and suitable for precise characterization. The RedDots campaigns seek to discover rocky planets orbiting nearby low-mass stars. The 2018 campaign targeted GJ 1061, which is the 20th nearest star to the Sun. For three consecutive months we obtained nightly, high-precision radial velocity measurements with the HARPS spectrograph. We analysed these data together with archival HARPS data. We report the detection of three plan

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3

Luque, Rafael, and Enric Pallé. "Density, not radius, separates rocky and water-rich small planets orbiting M dwarf stars." Science 377, no. 6611 (2022): 1211–14. http://dx.doi.org/10.1126/science.abl7164.

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Exoplanets smaller than Neptune are common around red dwarf stars (M dwarfs), with those that transit their host star constituting the bulk of known temperate worlds amenable for atmospheric characterization. We analyze the masses and radii of all known small transiting planets around M dwarfs, identifying three populations: rocky, water-rich, and gas-rich. Our results are inconsistent with the previously known bimodal radius distribution arising from atmospheric loss of a hydrogen/helium envelope. Instead, we propose that a density gap separates rocky from water-rich exoplanets. Formation mod

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4

Ding, Feng, and Robin D. Wordsworth. "Prospects for Water Vapor Detection in the Atmospheres of Temperate and Arid Rocky Exoplanets around M-dwarf Stars." Astrophysical Journal Letters 925, no. 1 (2022): L8. http://dx.doi.org/10.3847/2041-8213/ac4a5d.

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Abstract Detection of water vapor in the atmospheres of temperate, rocky exoplanets would be a major milestone on the path toward characterization of exoplanet habitability. Past modeling work has shown that cloud formation may prevent the detection of water vapor on Earth-like planets with surface oceans using the James Webb Space Telescope (JWST). Here we analyze the potential for atmospheric detection of H2O on a different class of targets: arid planets. Using transit spectrum simulations, we show that atmospheric H2O may be easier to detect on arid planets with cold-trapped ice deposits on

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5

Moore, Keavin, and Nicolas B. Cowan. "Keeping M-Earths habitable in the face of atmospheric loss by sequestering water in the mantle." Monthly Notices of the Royal Astronomical Society 496, no. 3 (2020): 3786–95. http://dx.doi.org/10.1093/mnras/staa1796.

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ABSTRACT Water cycling between Earth’s mantle and surface has previously been modelled and extrapolated to rocky exoplanets, but these studies neglected the host star. M-dwarf stars are more common than Sun-like stars and at least as likely to host temperate rocky planets (M-Earths). However, M dwarfs are active throughout their lifetimes; specifically, X-ray and extreme ultraviolet (XUV) radiation during their early evolution can cause rapid atmospheric loss on orbiting planets. The increased bolometric flux reaching M-Earths leads to warmer, moister upper atmospheres, while XUV radiation can

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6

Wells, R., K. Poppenhaeger, and C. A. Watson. "Validation of a temperate fourth planet in the K2-133 multiplanet system." Monthly Notices of the Royal Astronomical Society 487, no. 2 (2019): 1865–73. http://dx.doi.org/10.1093/mnras/stz1334.

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Abstract We present follow-up observations of the K2-133 multiplanet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star – with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone. Here, we report on the validation of the presence of the fourth planet, determining a radius of $1.73_{-0.13}^{+0.14}$ R⊕. The four planets span the radius gap of the exoplanet population, meaning further follow-up would be worthwhile to obtain masses and test theories of the origin of the gap. In particular, the trend of increasing

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7

Lobo, Ana H., Aomawa L. Shields, Igor Z. Palubski, and Eric Wolf. "Terminator Habitability: The Case for Limited Water Availability on M-dwarf Planets." Astrophysical Journal 945, no. 2 (2023): 161. http://dx.doi.org/10.3847/1538-4357/aca970.

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Abstract Rocky planets orbiting M-dwarf stars are among the most promising and abundant astronomical targets for detecting habitable climates. Planets in the M-dwarf habitable zone are likely synchronously rotating, such that we expect significant day–night temperature differences and potentially limited fractional habitability. Previous studies have focused on scenarios where fractional habitability is confined to the substellar or “eye” region, but in this paper we explore the possibility of planets with terminator habitability, defined by the existence of a habitable band at the transition

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8

Laliotis, Katherine, Jennifer A. Burt, Eric E. Mamajek, et al. "Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions*." Astronomical Journal 165, no. 4 (2023): 176. http://dx.doi.org/10.3847/1538-3881/acc067.

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Abstract Directly imaging temperate rocky planets orbiting nearby, Sun-like stars with a 6 m class IR/O/UV space telescope, recently dubbed the Habitable Worlds Observatory, is a high-priority goal of the Astro2020 Decadal Survey. To prepare for future direct imaging (DI) surveys, the list of potential targets should be thoroughly vetted to maximize efficiency and scientific yield. We present an analysis of archival radial velocity data for southern stars from the NASA/NSF Extreme Precision Radial Velocity (EPRV) Working Group’s list of high-priority target stars for future DI missions (drawn

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9

Krissansen-Totton, J., and J. J. Fortney. "Predictions for Observable Atmospheres of Trappist-1 Planets from a Fully Coupled Atmosphere–Interior Evolution Model." Astrophysical Journal 933, no. 1 (2022): 115. http://dx.doi.org/10.3847/1538-4357/ac69cb.

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Abstract The Trappist-1 planets provide a unique opportunity to test the current understanding of rocky planet evolution. The James Webb Space Telescope is expected to characterize the atmospheres of these planets, potentially detecting CO2, CO, H2O, CH4, or abiotic O2 from water photodissociation and subsequent hydrogen escape. Here, we apply a coupled atmosphere–interior evolution model to the Trappist-1 planets to anticipate their modern atmospheres. This model, which has previously been validated for Earth and Venus, connects magma ocean crystallization to temperate geochemical cycling. Ma

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10

Lingam, Manasvi, and Abraham Loeb. "Characteristics of aquatic biospheres on temperate planets around Sun-like stars and M dwarfs." Monthly Notices of the Royal Astronomical Society 503, no. 3 (2021): 3434–48. http://dx.doi.org/10.1093/mnras/stab611.

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ABSTRACT Aquatic biospheres reliant on oxygenic photosynthesis are expected to play an important role on Earth-like planets endowed with large-scale oceans insofar as carbon fixation (i.e. biosynthesis of organic compounds) is concerned. We investigate the properties of aquatic biospheres comprising Earth-like biota for habitable rocky planets orbiting Sun-like stars and late-type M dwarfs such as TRAPPIST-1. In particular, we estimate how these characteristics evolve with the available flux of photosynthetically active radiation (PAR) and the ambient ocean temperature (TW), the latter of whic

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