Results 61 to 70 of about 186,798 (170)
Journal of Geophysical Research: Planets, Volume 129, Issue 3, March 2024.Abstract Toroidal atmospheres and exospheres characterized at exoplanets may be fueled by volcanically active exomoons, often referred to as exo‐Ios. We study the neutral outgassing and volatile evolution of a close‐orbiting, evaporating satellite at eight candidate exoplanet‐exomoon systems WASP‐49,‐96,‐69,‐17 b, XO‐2N b, HAT‐P‐1 b, HD‐189733 b, and ...
M. Meyer zu Westram, A. V. Oza, A. Galli
wiley +1 more source
Making Extrasolar Planets From Solar Systems Via Dynamical Interactions
, 2010 Most stars form in some sort of stellar cluster or association. In such environments the number density of stars is much higher than in the solar neighbourhood, which means that close encounters between stars may be relatively common.
D. Malmberg +4 more
core +1 more source
Direct Imaging Constraints on Binary Planets and Exomoons around Epsilon Indi A b
The Astronomical JournalEpsilon Indi A b (hereafter Eps Ind A b) is a directly imaged ∼6 M _Jup exoplanet orbiting a nearby (3.6 pc) K dwarf at ∼30 au. We analyze archival JWST/MIRI 15 μ m coronagraphic imaging of this planet to search for directly imaged satellites orbiting ...
Matson C. Garza +8 more
doaj +1 more source
TOI-1859b: A 64 Day Warm Jupiter on an Eccentric and Misaligned Orbit
The Astrophysical Journal Letters, 2023 Warm Jupiters are close-in giant planets with relatively large planet–star separations (i.e., 10 < a / R _⋆ < 100). Given their weak tidal interactions with their host stars, measurements of stellar obliquity may be used to probe the initial obliquity ...
Jiayin Dong +33 more
doaj +1 more source
A Population Synthesis Study on the Formation of Cold Jupiters from Truncated Planetesimal Disks
The Astrophysical JournalThe occurrence rate of giant planets increases with orbital period and turns over at a location that roughly corresponds to the snowline of solar-type stars.
Kangrou Guo +5 more
doaj +1 more source
On the Exoplanet Yield of Gaia Astrometry
The Astronomical JournalWe reexamine the expected yield of Gaia astrometric planet detections using updated models for giant-planet occurrence, the local stellar population, and Gaia’s demonstrated astrometric precision. Our analysis combines a semianalytic model that clarifies
Caleb Lammers, Joshua N. Winn
doaj +1 more source
The Astronomical JournalWe have conducted a planetary radial velocity measurement of the ultrahot Jupiter WASP-121b using JWST NIRSpec phase curve data. Our analysis reveals the Doppler shift of the planetary spectral lines across the full orbit, which shifts considerably ...
David K. Sing +5 more
doaj +1 more source
The atmospheres of extrasolar planets [PDF]
, 2014 The discovery of extrasolar planets, or “exoplanets” – i.e., planets orbiting around other stars – may be seen as the major discovery of astronomy over the past two decades.
Thérèse Encrenaz, Encrenaz, Thérèse
core +1 more source
Nondetections of Helium in the Young Sub-Jovian Planets K2-100b, HD 63433b, and V1298 Tau c
The Astronomical JournalWe search for excess in-transit absorption of neutral helium at 1.083 μ m in the atmospheres of the young (
Munazza K. Alam +12 more
doaj +1 more source
The influence of galactic cosmic rays on ion-neutral hydrocarbon chemistry in the upper atmospheres of free-floating exoplanets [PDF]
, 2014 The authors highlight financial support of the European Community under the FP7 by an ERC starting grant.Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry.
P. B. Rimmer +5 more
core +1 more source