Results 81 to 90 of about 1,040 (180)

EUV influences on exoplanet atmospheric stability and evolution

, 2019
Science white paper submitted to the Astro2020 Decadal Survey.
Youngblood, Allison, France, Kevin, Koskinen, Tommi, Fossati, Luca, Amerstorfer, Ute, Lichtenegger, Herbert, Drake, Jeremy, Mason, James, Fleming, Brian, Allred, Joel, Berta-Thompson, Zachory, Bourrier, Vincent, Froning, Cynthia, Garraffo, Cecilia, Gronoff, Guillaume, Jin, Meng, Kowalski, Adam, Osten, Rachel   +17 more
openaire   +2 more sources

Peas-in-a-pod across the Radius Valley: Rocky Systems Are Less Uniform in Mass but More Uniform in Size and Spacing

The Astrophysical Journal Letters
The ubiquity of “peas-in-a-pod” architectural patterns and the existence of the radius valley each presents a striking population-level trend for planets with R _p ≤ 4 R _⊕ that serves to place powerful constraints on the formation and evolution of these
Armaan V. Goyal, Songhu Wang
doaj   +1 more source

Coupled Planetary Interior and Tidal Evolution

The Astrophysical Journal
We present a new planetary structure/thermal evolution model, designed for use in problems that couple orbital dynamics with planetary structure. We first benchmark our structural/thermal evolution calculations against the MESA stellar evolution code ...
Tim Hallatt, Sarah Millholland
doaj   +1 more source

Architectures of Exoplanetary Systems. IV. A Multiplanet Model for Reproducing the Radius Valley and Intrasystem Size Similarity of Planets around Kepler’s FGK Dwarfs

The Astrophysical Journal
The Kepler-observed distribution of planet sizes has revealed two distinct patterns: (1) a radius valley separating super-Earths and sub-Neptunes and (2) a preference for intrasystem size similarity.
Matthias Y. He, Eric B. Ford
doaj   +1 more source

Unexpected Near-Resonant and Metastable States of Young Multiplanet Systems

The Astrophysical Journal
Recent observations suggest that the incidence of near-resonant planets declines as planetary systems age, making young planetary systems key signposts of early dynamical evolution.
Zhecheng Hu, Fei Dai, Wei Zhu, Mu-Tian Wang, Max Goldberg, Caleb Lammers, Kento Masuda   +6 more
doaj   +1 more source

Far-ultraviolet Flares and Variability of the Young M Dwarf AU Mic: A Nondetection of Planet C in Transit at Lyα

The Astronomical Journal
Atmospheric escape’s potential to shape the exoplanet population motivates detailed observations of systems actively undergoing escape. AU Mic is a young and active M dwarf hosting two close-in transiting sub- to Neptune-sized planets. Atmospheric escape
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood, Girish M. Duvvuri, Emily A. Gilbert, Peter Plavchan, Peter Gao, Hans-R. Müller, Adina D. Feinstein, Thomas Barclay, Eric D. Lopez   +10 more
doaj   +1 more source

Not All Sub-Neptune Exoplanets Have Magma Oceans

The Astrophysical Journal Letters
The evolution and structure of sub-Neptunes may be strongly influenced by interactions between the outer gaseous envelope of the planet and a surface magma ocean.
Bodie Breza, Matthew C. Nixon, Eliza M.-R. Kempton   +2 more
doaj   +1 more source

Simulation of the Spin Evolution of Some Selected Exoplanets and Inferences on Their Climate

Universe
In this work, using the simulator VPLanet, we analyze the spin evolution of some selected exoplanets due to the tidal interaction with their host star. For a rocky planet, two spin “conditions” are possible, the “trapped” rotation and the “fast” rotation, referring to the cases of achieved and non-achieved tidal trapping, respectively.
Salvatore Camposeo, Francesco De Paolis, Vincenzo Orofino, Francesco Strafella, Leonardo Di Venere   +4 more
openaire   +3 more sources

No Strong Associations between Eccentricity and Orbital Architecture in Kepler Compact Multis

The Astronomical Journal
The dynamical history of a planetary system is recorded in the present day architecture of its constituent planets’ sizes, orbital periods, and eccentricities.
Gregory J. Gilbert, Erik A. Petigura, Paige M. Entrican   +2 more
doaj   +1 more source

OrbDot: A Python package for studying the secular evolution of exoplanet orbits

Journal of Open Source Software
OrbDot is a Python package for studying the secular (long-term) evolution of exoplanet orbits from observational data. It employs nested sampling algorithms to fit evolutionary models to any combination of transit and eclipse mid-times, radial velocities, and transit durations.
Simone R. Hagey, Aaron C. Boley
openaire   +2 more sources