Results 41 to 50 of about 40,892 (232)
The Possible Evolution of an Exoplanet’s Atmosphere
Eos, 2021 Scientific sleuths explore data gathered trillions of kilometers away and put forth different, and often conflicting, ideas to reconstruct the gaseous envelope on a distant rocky exoplanet, GJ 1132 b.
openaire +1 more source
The GAPS Programme at TNG. LXI. Atmospheric parameters and elemental abundances of TESS young exoplanet host stars [PDF]
Astronomy & AstrophysicsThe study of exoplanets at different evolutionary stages can shed light on their formation, migration, and evolution. The determination of exoplanet properties depends on the properties of their host stars.
S. Filomeno +28 more
semanticscholar +1 more source
Helium Atmospheres on Warm Neptune- and Sub-Neptune-Sized Exoplanets and Applications to GJ 436 b [PDF]
, 2015 Warm Neptune- and sub-Neptune-sized exoplanets in orbits smaller than Mercury's are thought to have experienced extensive atmospheric evolution. Here we propose that a potential outcome of this atmospheric evolution is the formation of helium-dominated ...
Hu, Renyu, Seager, Sara, Yung, Yuk L.
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Scaling K2. VII. Evidence For a High Occurrence Rate of Hot Sub-Neptunes at Intermediate Ages
The Astronomical Journal, 2023 The NASA K2 mission obtained high-precision time-series photometry for four young clusters, including the near-twin 600–800 Myr old Praesepe and Hyades clusters. Hot sub-Neptunes are highly prone to mass-loss mechanisms, given their proximity to the host
Jessie L. Christiansen +8 more
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Deuterium Escape on Photoevaporating Sub-Neptunes
The Astrophysical Journal Letters, 2023 We investigate the evolution of the deuterium-to-hydrogen (D/H) mass ratio driven by EUV photoevaporation of hydrogen-rich atmospheres of close-in sub-Neptunes around solar-type stars.
Pin-Gao Gu, Howard Chen
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Spectral Evolution of an Earth-Like Planet [PDF]
, 2006 We have developed a characterization of the geological evolution of the Earths atmosphere and surface in order to model the observable spectra of an Earth-like planet through its geological history.
Cloud P. E. +4 more
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The Astronomical Journal, 2023 Irradiated Jovian atmospheres are complex and dynamic and can undergo temporal variations due to the close proximity of their parent stars. Of the Jovian planets that have been cataloged to date, KELT-9b is the hottest gas giant known, with an ...
Nataliea Lowson +12 more
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Spectral evolution of gaseous exoplanet atmospheres due to hydrodynamic escape
, 2023 The evolution of stars on grand time-scales affect their surroundings in many ways. Due to their intrinsic rotation, causing strong magnetic activity, they vary greatly in radiative activity in X-ray and ultraviolet (XUV) throughout their lifetime. Planets orbiting these stars close-in could, consequently, be affected by these drastic radiative changes.
Amy Louca, Yamila Miguel
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Climate Modeling of a Potential ExoVenus [PDF]
, 2018 The planetary mass and radius sensitivity of exoplanet discovery capabilities has reached into the terrestrial regime. The focus of such investigations is to search within the Habitable Zone where a modern Earth-like atmosphere may be a viable comparison.
Ceja, Alma Y. +3 more
core +4 more sources
Detecting Unresolved Binaries in TESS Data with Speckle Imaging [PDF]
, 2019 The Transiting Exoplanet Survey Satellite (TESS) is conducting a two-year wide-field survey searching for transiting exoplanets around nearby bright stars that will be ideal for follow-up characterization. To facilitate studies of planet compositions and
Ciardi, David +2 more
core +3 more sources