Results 31 to 40 of about 252 (123)
Mass–Radius Relationships and Contraction of Condensed Planets by Cooling or Despinning
The Astrophysical JournalCondensed planets contract or expand as their temperature changes. With the exception of the effect of phase changes, this phenomenon is generally interpreted as being solely related to the thermal expansivity of the planet’s components. However, changes
Yanick Ricard, Frédéric Chambat
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The Astrophysical JournalUnderstanding the surface temperature and interior structure of cold-to-temperate sub-Neptunes is critical for assessing their habitability, yet direct observations are challenging.
Ziyu Huang +7 more
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The Effect of Guide Star Variability on PLATO Pointing Stability
The Astronomical JournalThe main science goal of the PLAnetary Transits and Oscillations of stars (PLATO) is to detect and characterize extrasolar planets, including terrestrial planets in the habitable zone (HZ) of their host stars.
Sam Bowling +8 more
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Unveiling the Interior Structure and Thermal Evolution of Super-Earth GJ 486b
The Astrophysical JournalRecent ground- and space-based surveys have shown that planets between Earth and Neptune in size, known as “super-Earths,” are among the most frequently found planets in the Galaxy. Although the JWST era has provided high-quality atmospheric data on many
Chandan K. Sahu +3 more
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Accelerating Giant-impact Simulations with Machine Learning
The Astrophysical JournalConstraining planet-formation models based on the observed exoplanet population requires generating large samples of synthetic planetary systems, which can be computationally prohibitive.
Caleb Lammers +5 more
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JWST TRAPPIST-1 e/b Program: Motivation and First Observations
The Astronomical JournalOne of the forefront goals in the field of exoplanets is the detection of an atmosphere on a temperate terrestrial exoplanet, and among the best suited systems to do so is TRAPPIST-1.
Natalie H. Allen +26 more
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No Thick Atmosphere on the Terrestrial Exoplanet Gl 486b
The Astrophysical Journal LettersA primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence of atmospheres on M-Earths is highly uncertain because their host stars’ extended history of high X-ray and ...
Megan Weiner Mansfield +10 more
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Validation of a Third Earth-sized Planet in the TOI-2267 Binary System
The Astronomical JournalWe report the validation of a third terrestrial exoplanet in the nearby (22 pc) TOI-2267 system. TOI-2267 is a binary system with stellar components TOI-2267A (M5, 3030 K) and TOI-2267B (M6, 2930 K), with an on-sky separation of 0 $\mathop{.}\limits ...
Michael Greklek-McKeon +15 more
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JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b
The Astronomical JournalWe present JWST NIRSpec/G395H transmission spectroscopy observations of GJ 357 b, a warm ( T _eq ≈ 525 K) super-Earth (1.2 R _⊕ , 1.84 M _⊕ ) orbiting a nearby M3-type star, with a median precision of 18 ppm and 27 ppm in NRS1 and NRS2, respectively ...
Jea Adams Redai +16 more
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The Coupled Impacts of Atmospheric Composition and Obliquity on the Climate Dynamics of TRAPPIST-1e
The Astrophysical JournalPlanets in multiplanet systems are expected to migrate inward as near-resonant chains, thus allowing them to undergo gravitational planet–planet interactions and possibly maintain a nonzero obliquity.
Tobi Hammond, Thaddeus D. Komacek
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