Results 11 to 20 of about 226 (101)

The physics of extrasolar gaseous planets : from theory to observable signatures

open access: yes, 2004
We review our present understanding of the physical properties of substellar objects, brown dwarfs and irradiated or non-irradiated gaseous exoplanets. This includes a description of their internal properties, mechanical structure and heat content, their atmospheric properties, thermal profile and emergent spectrum, and their evolution, in particular ...
Chabrier, Gilles   +4 more
openaire   +3 more sources

Three Long-period Transiting Giant Planets from TESS

open access: yesThe Astronomical Journal, 2023
We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single-transit events in the light curves generated from the full-frame images of the Transiting ...
Rafael Brahm   +54 more
doaj   +1 more source

Probing Reflection from Aerosols with the Near-infrared Dayside Spectrum of WASP-80b

open access: yesThe Astrophysical Journal Letters, 2023
The presence of aerosols is intimately linked to the global energy budget and the composition of a planet’s atmosphere. Their ability to reflect incoming light prevents energy from being deposited into the atmosphere, and they shape the spectra of ...
Bob Jacobs   +11 more
doaj   +1 more source

TOI-5344 b: A Saturn-like Planet Orbiting a Super-solar Metallicity M0 Dwarf

open access: yesThe Astronomical Journal, 2023
We confirm the planetary nature of TOI-5344 b as a transiting giant exoplanet around an M0-dwarf star. TOI-5344 b was discovered with the Transiting Exoplanet Survey Satellite photometry and confirmed with ground-based photometry (the Red Buttes ...
Te Han   +21 more
doaj   +1 more source

Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994

open access: yesThe Astronomical Journal
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite.
Romy Rodríguez Martínez   +48 more
doaj   +1 more source

Highly Depleted Alkali Metals in Jupiter’s Deep Atmosphere

open access: yesThe Astrophysical Journal Letters, 2023
Water and ammonia vapors are known to be the major sources of spectral absorption at pressure levels observed by the microwave radiometer (MWR) on Juno. However, the brightness temperatures and limb darkening observed by the MWR at its longest-wavelength
Ananyo Bhattacharya   +14 more
doaj   +1 more source

The Radiative Effects of Photochemical Hazes on the Atmospheric Circulation and Phase Curves of Sub-Neptunes

open access: yesThe Astrophysical Journal
Measuring the atmospheric composition of hazy sub-Neptunes like GJ 1214b through transmission spectroscopy is difficult because of the degeneracy between mean molecular weight (MMW) and haziness.
Maria E. Steinrueck   +15 more
doaj   +1 more source

Occurrence Rate of Hot Jupiters Around Early-type M Dwarfs Based on Transiting Exoplanet Survey Satellite Data

open access: yesThe Astronomical Journal, 2022
We present an estimate of the occurrence rate of hot Jupiters (7 R _⊕ ≤ R _p ≤ 2 R _J , 0.8 ≤ P _b ≤ 10 days) around early-type M dwarfs based on stars observed by the Transiting Exoplanet Survey Satellite (TESS) during its primary mission.
Tianjun Gan   +28 more
doaj   +1 more source

Confirming the Warm and Dense Sub-Saturn TIC 139270665 b with the Automated Planet Finder and Unistellar Citizen Science Network

open access: yesThe Astronomical Journal
We report the discovery and confirmation of the Transiting Exoplanet Survey Satellite (TESS) single-transit, warm and dense sub-Saturn, TIC 139270665 b. This planet is unusually dense for its size: with a bulk density of 2.13 g cm ^−3 (0.645 R _J , 0.463
Daniel O’Conner Peluso   +62 more
doaj   +1 more source

The Narrow Formation Pathway of Hot Saturns: Constraints on Initial Planetary Properties

open access: yesThe Astrophysical Journal
The observed exoplanet population exhibits a scarcity of short-period Saturn-mass planets, a phenomenon referred to as the “hot-Saturn desert.” This observational scarcity can be utilized to validate the theories regarding the formation and evolution of ...
Minghao Xie, Sheng Jin, Dong-Hong Wu
doaj   +1 more source

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