Results 71 to 80 of about 725,063 (120)

True Polar Wander of Lava Worlds

The Astrophysical Journal Letters, 2023
As one of the most detectable types of terrestrial planets, lava worlds are highly prioritized targets for exoplanet atmosphere characterization since their atmospheres may reveal what they are made of and how.
Wanying Kang, Francis Nimmo, Feng Ding
doaj   +1 more source

Properties of Sub-Neptune Atmospheres: TOI-270 System [PDF]

, 2020
We investigate the potential for the James Webb Space Telescope (JWST) to detect and characterize the atmospheres of the sub-Neptunian exoplanets in the TOI-270 system. Sub-Neptunes are considered more likely to be water worlds than gas dwarfs. We model their atmospheres using three atmospheric compositions - two examples of hydrogen-dominated ...
arxiv   +1 more source

Constraining the Thickness of TRAPPIST-1 b’s Atmosphere from Its JWST Secondary Eclipse Observation at 15 μm

The Astrophysical Journal Letters, 2023
Recently, the first JWST measurement of thermal emission from a rocky exoplanet was reported. The inferred dayside brightness temperature of TRAPPIST-1 b at 15 μ m is consistent with the planet having no atmosphere and therefore no mechanism by which to ...
Jegug Ih, Eliza M.-R. Kempton, Emily A. Whittaker, Madeline Lessard   +3 more
doaj   +1 more source

Helium Absorption at 1083 nm from Extended Exoplanet Atmospheres: Dependence on Stellar Radiation [PDF]

Astrophysical Journal, 2019
Strong absorption signatures in the helium line at 1083 nm have recently been detected in transmission spectra of several close-in exoplanets. This absorption line originates from neutral helium atoms in an excited, metastable 23S state.
A. Oklopčić
semanticscholar   +1 more source

Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST

The Astronomical Journal
HIP94235 b, a 120 Myr old sub-Neptune, provides us the unique opportunity to study mass loss at a pivotal stage of the system’s evolution: the end of a 100 Myr old phase of intense XUV irradiation.
Ava Morrissey, George Zhou, Chelsea X. Huang, Duncan Wright, Caitlin Auger, Keighley E. Rockcliffe, Elisabeth R. Newton, James G. Rogers, Neale Gibson, Nataliea Lowson, L. C. Mayorga, Robert A. Wittenmyer   +11 more
doaj   +1 more source

Photochemistry in Hot H2-dominated Exoplanet Atmospheres [PDF]

Astrophysical Journal, 2019
Photochemistry has the potential to substantially impact the atmospheric composition of exoplanets with consequences on the radiative transfer, thermal structure, and dynamics of the atmospheres, particularly in UV-rich stellar environments.
B. Fleury, M. Gudipati, B. Henderson, M. Swain   +3 more
semanticscholar   +1 more source

Thermal Phase Curves in Hot Gas Giant Exoplanets Exhibit a Complex Dependence on Planetary Properties

The Astrophysical Journal
We present a catalog of uniformly processed 3.6 μ m and 4.5 μ m band exoplanet thermal phase curves based on Infrared Array Camera observations obtained from the Spitzer Heritage Archive.
Mark R. Swain, Kyle A. Pearson, Thaddeus D. Komacek, Geoffrey Bryden, Emeline Fromont, Gautam Vasisht, Gael Roudier, Robert T. Zellem   +7 more
doaj   +1 more source

Modeling Atmospheric Lines by the Exoplanet Community (MALBEC) Version 1.0: A CUISINES Radiative Transfer Intercomparison Project

The Planetary Science Journal
Radiative transfer (RT) models are critical in the interpretation of exoplanetary spectra, in simulating exoplanet climates, and when designing the specifications of future flagship observatories.
Geronimo L. Villanueva, Thomas J. Fauchez, Vincent Kofman, Eleonora Alei, Elspeth K. H. Lee, Estelle Janin, Michael D. Himes, Jérémy Leconte, Michaela Leung, Sara Faggi, Mei Ting Mak, Denis E. Sergeev, Thea Kozakis, James Manners, Nathan Mayne, Edward W. Schwieterman, Alex R. Howe, Natasha Batalha   +17 more
doaj   +1 more source

Atmospheric Retrieval of L Dwarfs: Benchmarking Results and Characterizing the Young Planetary Mass Companion HD 106906 b in the Near-infrared

The Astronomical Journal, 2023
We present model constraints on the atmospheric structure of HD 106906 b, a planetary-mass companion orbiting at a ∼700 au projected separation around a 15 Myr old stellar binary, using the APOLLO retrieval code on spectral data spanning 1.1–2.5 μ m. C/O
Arthur D. Adams, Michael R. Meyer, Alex R. Howe, Ben Burningham, Sebastian Daemgen, Jonathan Fortney, Mike Line, Mark Marley, Sascha P. Quanz, Kamen Todorov   +9 more
doaj   +1 more source

Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) [PDF]

Astronomy & Astrophysics, 2019
High-resolution optical spectroscopy is a powerful tool to characterise exoplanetary atmospheres from the ground. The sodium D lines, with their large cross sections, are especially suited to studying the upper layers of atmospheres in this context.
J. Seidel, D. Ehrenreich, A. Wyttenbach, R. Allart, M. Lendl, L. Pino, V. Bourrier, H. Cegla, C. Lovis, D. Barrado, D. Bayliss, N. Astudillo-Defru, A. Deline, C. Fisher, K. Heng, R. Joseph, B. Lavie, C. Melo, F. Pepe, D. S'egrasan, S. Genève, Ch, L. Observatory, Leiden University, Nl, S. R. Institute, Austrian Academy of Sciences, At, A. S. M. F. Astronomy, U. Amsterdam, Cheops Fellow, Snsf NCCR-PlanetS, D. Astrof'isica, C. D. Astrobiolog'ia, ès, D. Physics, U. Warwick, UK., U. Concepci'on, D. D. Astronom'ia, Cl, Center for Space, Habitability, U. Bern, Laboratoire d'astrophysique, 'Ecole polytechnique f'ed'erale de Lausanne, E. Observatory   +46 more
semanticscholar   +1 more source