Results 51 to 60 of about 2,690,574 (274)

A Unified Treatment of Kepler Occurrence to Trace Planet Evolution. I. Methodology [PDF]

open access: yesAstronomical Journal, 2023
We present Kepler exoplanet occurrence rates for planets between 0.5 and 16 R ⊕ and between 1 and 400 days. To measure occurrence, we use a nonparametric method via a kernel density estimator and use bootstrap random sampling for uncertainty estimation ...
A. Dattilo, N. Batalha, S. Bryson
semanticscholar   +1 more source

Dynamical Evolution of Closely Packed Multiple Planetary Systems Subject to Atmospheric Mass Loss

open access: yesThe Astronomical Journal, 2023
A gap in exoplanets’ radius distribution has been widely attributed to the photoevaporation threshold of their progenitors’ gaseous envelope. Giant impacts can also lead to substantial mass loss.
Su Wang, D. N. C. Lin
doaj   +1 more source

Observational Constraints on the Formation and Evolution of Neptune-Class Exoplanets [PDF]

open access: yesSpace Science Reviews, 2020
21 pages, 6 ...
Deleuil, Magali   +4 more
openaire   +5 more sources

Dust Growth and Evolution in Protoplanetary Disks [PDF]

open access: yesAnnual Review of Astronomy and Astrophysics, 2023
Over the past decade, advancement of observational capabilities, specifically the Atacama Large Millimeter/submillimeter Array (ALMA) and Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instruments, alongside theoretical innovations like ...
T. Birnstiel
semanticscholar   +1 more source

Towards a new era in giant exoplanet characterisation [PDF]

open access: yesAstronomy & Astrophysics, 2022
Determining the composition of giant exoplanets is crucial for understanding their origin and evolution. However, the planetary bulk composition is not measured directly but must be deduced from a combination of mass-radius measurements, knowledge of the
S. Muller, R. Helled
semanticscholar   +1 more source

The impact of time-dependent stellar activity on exoplanet atmospheres [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2022
M-dwarfs are thought to be hostile environments for exoplanets. Stellar events are very common on such stars. These events might cause the atmospheres of exoplanets to change significantly over time.
A. Louca   +5 more
semanticscholar   +1 more source

A calibration point for stellar evolution from massive star asteroseismology [PDF]

open access: yesNature Astronomy, 2023
Transiting Exoplanet Survey Satellite data of the massive star HD 192575 reveal pulsation frequencies that allow the inference of its convective core mass and interior rotation profile, thus providing a calibration point for interior chemical and angular
S. Burssens   +12 more
semanticscholar   +1 more source

TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain

open access: yesThe Astronomical Journal, 2023
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, a 700 ±
Fei Dai   +62 more
doaj   +1 more source

Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) [PDF]

open access: yesAstronomy & Astrophysics, 2020
Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres.
V. Bourrier   +23 more
semanticscholar   +1 more source

Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems [PDF]

open access: yes, 2006
We present results of a reconnaissance for stellar companions to all 131 radial-velocity-detected candidate extrasolar planetary systems known as of July 1, 2005.
Beaulieu, Thom D.   +6 more
core   +2 more sources

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