Results 21 to 30 of about 298 (156)
Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems
The Astronomical Journal, 2023 The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that near-resonant systems have likely experienced minimal dynamical disruptions, the spin–orbit orientations of ...
Malena Rice +20 more
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The Astrophysical Journal, 2023 Protoplanets formed in a marginally gravitationally unstable (MGU) disk by either core accretion or disk instability will be subject to dynamical interactions with massive spiral arms, possibly resulting in inward or outward orbital migration, mergers ...
Alan P. Boss
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Hot Jupiters Have Giant Companions: Evidence for Coplanar High-eccentricity Migration
The Astrophysical Journal Letters, 2023 This study considers the characteristics of planetary systems with giant planets based on a population-level analysis of the California Legacy Survey planet catalog. We identified three characteristics common to hot Jupiters (HJs).
Jon K. Zink, Andrew W. Howard
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Effects of Planetesimal Scattering: Explaining the Observed Offsets from Period Ratios 3:2 and 2:1
The Astrophysical Journal, 2023 The observed deficit and excess of adjacent planet pairs with period ratios narrow and wide of 3:2 and 2:1, the nominal values for the corresponding mean-motion resonances (MMRs), have intrigued many. Previously, using a suite of simulations, Chatterjee &
Tuhin Ghosh, Sourav Chatterjee
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Confirming Resonance in Three Transiting Systems
The Astronomical Journal, 2023 Although resonant planets have orbital periods near commensurability, resonance is also dictated by other factors, such as the planets’ eccentricities and masses, and therefore must be confirmed through a study of the system’s dynamics.
Tyler Quinn, Mariah G. MacDonald
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Outward Migration of a Gas Accreting Planet: A Semianalytical Formula
The Astrophysical JournalType II orbital migration is a key process to regulate the mass and semimajor axis distribution of exoplanetary giant planets. The conventional formula of Type II migration generally predicts too rapid inward migration to reconcile with the observed ...
Shigeru Ida +4 more
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The Orbit of Warm Jupiter WASP-106 b is Aligned with its Star
The Astronomical Journal, 2023 Understanding orbital obliquities, or the misalignment angles between a star’s rotation axis and the orbital axis of its planets, is crucial for unraveling the mechanisms of planetary formation and migration.
Jan-Vincent Harre +5 more
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Evolution of Terrestrial Planetary Bodies and Implications for Habitability
Reviews of Geophysics, Volume 63, Issue 4, December 2025.Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood +4 more
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The Astrophysical Journal Supplement SeriesGiant planets are expected to predominantly form beyond the water-ice line and occasionally undergo inward migration. Unlike hot Jupiters, which can result from high-eccentricity tidal migration, warm Jupiters between 0.1 and 1 au (≈10–365 days) are in ...
Marvin Morgan +6 more
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A High-Eccentricity Warm Jupiter Orbiting TOI-4127
The Astronomical Journal, 2023 We report the discovery of TOI-4127 b, which is a transiting, Jupiter-sized exoplanet on a long-period ( $P={56.39879}_{-0.00010}^{+0.00010}$ days) and a high-eccentricity orbit around a late F-type dwarf star.
Arvind F. Gupta +39 more
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