Results 51 to 60 of about 740,794 (260)
Methanol—A Poor Biosignature Gas in Exoplanet Atmospheres
Astrophysical Journal, 2022 Biosignature gas research has been growing in recent years thanks to next-generation space- and ground-based telescopes. Methanol (CH3OH) has many advantages as a biosignature gas candidate.
Jingcheng Huang +4 more
semanticscholar +1 more source
Variable Irradiation on 1D Cloudless Eccentric Exoplanet Atmospheres [PDF]
Astrophysical Journal, 2021 Exoplanets on eccentric orbits experience an incident stellar flux that can be markedly larger at periastron versus apoastron. This variation in instellation can lead to dramatic changes in atmospheric structure in regions of the atmosphere where the ...
L. Mayorga +4 more
semanticscholar +1 more source
Detection of an Atmosphere on a Rocky Exoplanet [PDF]
The Astronomical Journal, 2021 Abstract We report the detection of an atmosphere on a rocky exoplanet, GJ 1132 b, which is similar to Earth in terms of size and density. The atmospheric transmission spectrum was detected using Hubble WFC3 measurements and shows spectral signatures of aerosol scattering, HCN, and CH4 in a low mean molecular weight atmosphere.
Mark R. Swain +9 more
openaire +4 more sources
Assessment of Ammonia as a Biosignature Gas in Exoplanet Atmospheres. [PDF]
Astrobiology, 2021 Ammonia (NH3) in a terrestrial planet atmosphere is generally a good biosignature gas, primarily because terrestrial planets have no significant known abiotic NH3 source.
Jingcheng Huang +4 more
semanticscholar +1 more source
Nonthermal Atmospheric Escape on the Kepler-11 “Super-Earths” Driven by Stellar Wind Sputtering
The Astrophysical Journal, 2023 Jeans escape or hydrodynamic escape is believed to dominate atmospheric loss for hot Jupiters. However, nonthermal mechanisms likely contribute substantially on hydrogen-rich “super-Earths” with relatively cold and extended atmospheres.
Hao Gu +4 more
doaj +1 more source
A Comparison of Chemical Models of Exoplanet Atmospheres Enabled by TauREx 3.1 [PDF]
Astrophysical Journal, 2021 Thermochemical equilibrium is one of the most commonly used assumptions in current exoplanet retrievals. As science operations with the James Webb Space Telescope (JWST) draw near and with the planned launch of Ariel, it is crucial to assess the ...
A. Al-Refaie +4 more
semanticscholar +1 more source
Helium in the eroding atmosphere of an exoplanet [PDF]
Nature, 2018 Helium is the second-most abundant element in the Universe after hydrogen and is one of the main constituents of gas-giant planets in our Solar System. Early theoretical models predicted helium to be among the most readily detectable species in the atmospheres of exoplanets, especially in extended and escaping atmospheres 1 .
Yifan Zhou +23 more
openaire +7 more sources
Composition of terrestrial exoplanet atmospheres from meteorite outgassing experiments [PDF]
Nature Astronomy, 2021 Terrestrial exoplanets likely form initial atmospheres through outgassing during and after accretion, although there is currently no first-principles understanding of how to connect a planet’s bulk composition to its early atmospheric properties ...
M. Thompson +5 more
semanticscholar +1 more source
Exoplanet Atmospheres and Photochemistry [PDF]
Proceedings of the International Astronomical Union, 2006 Over 150 extrasolar planets are known to orbit sun-like stars. A growing number of them (9 to date) are transiting “hot Jupiters” whose physical characteristics can be measured. Atmospheres of two of these planets have already been detected. We summarize the atmosphere detections and useful upper limits, focusing on the MOST albedo upper limit and II ...
Seager, S. +3 more
openaire +4 more sources
Measuring titanium isotope ratios in exoplanet atmospheres [PDF]
Astronomy & Astrophysics, 2021 [abridged] Measurements of relative isotope abundances can provide unique insights into the formation and evolution histories of celestial bodies. The five stable isotopes of titanium are used to study the early history of the solar system and constrain ...
Dilovan B. Serindag +2 more
semanticscholar +1 more source