Results 141 to 150 of about 8,194 (235)

Stability of hydrides in sub-Neptune exoplanets with thick hydrogen-rich atmospheres. [PDF]

Proc Natl Acad Sci U S A, 2023
Kim T, Wei X, Chariton S, Prakapenka VB, Ryu YJ, Yang S, Shim SH.   +6 more
europepmc   +1 more source

Carving Out the Inner Edge of the Period Ratio Distribution through Giant Impacts

The Astrophysical Journal
The distribution of orbital period ratios between adjacent observed exoplanets is approximately uniform, but exhibits a strong falloff toward close orbital separations.
Kaitlyn Chen, Oswaldo Cardenas, Brandon Bonifacio, Nikolas Hall, Rori Kang, Daniel Tamayo   +5 more
doaj   +1 more source

An Obliquity Measurement of the Hot Neptune TOI-1694b

The Astronomical Journal
We present spectral observations of the multiplanet host TOI-1694 during the transit of TOI-1694b, a 26.1 M _⊕ hot Neptune with a 3.77 day orbit. By analyzing radial velocities obtained from the Keck Planet Finder, we modeled the Rossiter–McLaughlin ...
Luke B. Handley, Andrew W. Howard, Ryan A. Rubenzahl, Fei Dai, Dakotah Tyler, Rena A. Lee, Steven Giacalone, Howard Isaacson, Benjamin Fulton, Aaron Householder, Samuel Halverson, Arpita Roy, Josh Walawender   +12 more
doaj   +1 more source

Observational Signatures of a Previous Dynamical Instability in Multi-planet M-dwarf Systems

The Astrophysical Journal
We identify observational signatures suggesting a history of dynamical instability in 26 out of 34 M-dwarf multi-planet systems containing no large planets.
Anna C. Childs, Alexa P. S. Hua, Rebecca G. Martin, Chao-Chin Yang, Aaron M. Geller   +4 more
doaj   +1 more source

The Spin–Orbit Alignment of Eight Warm Gas Giant Systems

The Astronomical Journal
Essential information about the formation and evolution of planetary systems can be found in their architectures—in particular, in stellar obliquity ( ψ )—as they serve as a signature of their dynamical evolution. Here we present ESPRESSO observations of
Juan I. Espinoza-Retamal, Andrés Jordán, Rafael Brahm, Cristobal Petrovich, Elyar Sedaghati, Guðmundur Stefánsson, Melissa J. Hobson, Marcelo Tala Pinto, Diego J. Muñoz, Gavin Boyle, Rodrigo Leiva, Vincent Suc   +11 more
doaj   +1 more source

Salty ice and the dilemma of ocean exoplanet habitability. [PDF]

Nat Commun, 2022
Journaux B.
europepmc   +1 more source

Ab initio quantum dynamics as a scalable solution to the exoplanet opacity challenge: A case study of CO$_2$ in hydrogen atmosphere [PDF]

Laurent Wiesenfeld, Prajwal Niraula, Julien de Wit, N. Jaı̈dane, Iouli E. Gordon, Robert J. Hargreaves   +5 more
openalex   +1 more source

Effects of Planetary Parameters on Disequilibrium Chemistry in Irradiated Planetary Atmospheres: From Gas Giants to Sub-Neptunes

The Astrophysical Journal
A primary goal of characterizing exoplanet atmospheres is to constrain planetary bulk properties, such as their metallicity, C/O ratio, and intrinsic heat.
Sagnick Mukherjee, Jonathan J. Fortney, Nicholas F. Wogan, David K. Sing, Kazumasa Ohno   +4 more
doaj   +1 more source

The orbital eccentricity distribution of planets orbiting M dwarfs. [PDF]

Proc Natl Acad Sci U S A, 2023
Sagear S, Ballard S.
europepmc   +1 more source

Kepler-discovered Multiple-planet Systems near Period Ratios Suggestive of Mean-motion Resonances Are Young

The Astronomical Journal
Before the launch of the Kepler Space Telescope, models of low-mass planet formation predicted that convergent type I migration would often produce systems of low-mass planets in low-order mean-motion resonances.
Jacob H. Hamer, Kevin C. Schlaufman
doaj   +1 more source