Results 101 to 110 of about 726,327 (196)

The Importance of Optical Wavelength Data on Atmospheric Retrievals of Exoplanet Transmission Spectra

The Astronomical Journal
Exoplanet transmission spectra provide rich information about the chemical composition, clouds, and temperature structure of exoplanet atmospheres. Most exoplanet transmission spectra only span infrared wavelengths (≳1 μ m), which can preclude crucial ...
Charlotte Fairman, Hannah R. Wakeford, Ryan J. MacDonald   +2 more
doaj   +1 more source

Exoplanet atmospheres with GIANO [PDF]

Astronomy & Astrophysics, 2018
Context. The study of exoplanetary atmospheres is key to understanding the differences between their physical, chemical, and dynamical processes. Until now, the bulk of atmospheric characterization analyses have been conducted on transiting planets. On a
G. Guilluy, A. Sozzetti, M. Brogi, A. Bonomo, P. Giacobbe, R. Claudi, S. Benatti   +6 more
semanticscholar   +1 more source

Ground-based Reconnaissance Observations of 21 Exoplanet Atmospheres with the Exoplanet Transmission Spectroscopy Imager

The Astronomical Journal
One of the most prolific methods of studying exoplanet atmospheres is transmission spectroscopy, which measures the difference between the depth of an exoplanet's transit signal at various wavelengths and attempts to correlate the depth changes to ...
Ryan J. Oelkers, Luke M. Schmidt, Erika Cook, Mary Anne Limbach, D. L. DePoy, J. L. Marshall, Jimmy Ardoin, Mitchell Barry, Evan Batteas, Alexandra Boone, Brant Conway, Silvana Delgado Adrande, John D. Dixon, Enrique Gonzalez-Vega, Alexandra Guajardo, Landon Holcomb, Christian Lambert, Shravan Menon, Divya Mishra, Jacob Purcell, Zachary Reed, Nathan Sala, Noah Siebersma, Nhu Ngoc Ton, Raenessa M. L. Walker, Z. Franklin Wang, Kaitlin Webber   +26 more
doaj   +1 more source

ATMOSPHERIC CHEMISTRY OF VENUS-LIKE EXOPLANETS [PDF]

The Astrophysical Journal, 2011
We use thermodynamic calculations to model atmospheric chemistry on terrestrial exoplanets that are hot enough for chemical equilibira between the atmosphere and lithosphere, as on Venus. The results of our calculations place constraints on abundances of spectroscopically observable gases, the surface temperature and pressure, and the mineralogy of the
Laura Schaefer, Bruce Fegley
openaire   +4 more sources

Atmospheric Circulation of Tide-Locked Exoplanets [PDF]

Annual Review of Fluid Mechanics, 2019
Tide-locked planets are planets in which tidal stresses from the host star have spun down the planet's rotation to the point where its length of sidereal day equals its length of year. In a nearly circular orbit, such planets have a permanent dayside and a permanent nightside, leading to extreme heating contrasts.
Pierrehumbert, R, Hammond, M
openaire   +2 more sources

On Atmospheric Retrievals of Exoplanets with Inhomogeneous Terminators

The Astrophysical Journal, 2022
Abstract The complexity of atmospheric retrieval models is largely data-driven, and one-dimensional models have generally been considered adequate with current data quality. However, recent studies have suggested that using 1D models in retrievals can result in anomalously cool terminator temperatures and biased abundance estimates even ...
Welbanks, L, Madhusudhan, N
openaire   +2 more sources

Hubble Space Telescope Transmission Spectroscopy for the Temperate Sub-Neptune TOI-270 d: A Possible Hydrogen-rich Atmosphere Containing Water Vapor

The Astronomical Journal, 2023
TOI-270 d is a temperate sub-Neptune discovered by the Transiting Exoplanet Survey Satellite (TESS) around a bright ( J = 9.1 mag) M3V host star. With an approximate radius of 2 R _⊕ and equilibrium temperature of 350 K, TOI-270 d is one of the most ...
Thomas Mikal-Evans, Nikku Madhusudhan, Jason Dittmann, Maximilian N. Günther, Luis Welbanks, Vincent Van Eylen, Ian J. M. Crossfield, Tansu Daylan, Laura Kreidberg   +8 more
doaj   +1 more source

Exoplanet Atmosphere Measurements from Transmission Spectroscopy and other Planet-Star Combined Light Observations [PDF]

, 2017
It is possible to learn a great deal about exoplanet atmospheres even when we cannot spatially resolve the planets from their host stars. In this chapter, we overview the basic techniques used to characterize transiting exoplanets - transmission spectroscopy, emission and reflection spectroscopy, and full-orbit phase curve observations.
arxiv   +1 more source

A New Window into Escaping Exoplanet Atmospheres: 10830 Å Line of Helium [PDF]

, 2017
Observational evidence for escaping exoplanet atmospheres has been obtained for a few exoplanets to date. It comes from strong transit signals detected in the ultraviolet, most notably in the wings of the hydrogen Lyα (Lyα) line. However, the core of the
A. Oklopčić, C. Hirata
semanticscholar   +1 more source

Detecting isotopologues in exoplanet atmospheres using ground-based high-dispersion spectroscopy [PDF]

Astronomy & Astrophysics, 2018
Context. The cross-correlation technique is a well-tested method for exoplanet characterization, having lead to the detection of various molecules, to constraints on atmospheric temperature profiles, wind speeds, and planetary spin rates.
P. Mollière, I. Snellen
semanticscholar   +1 more source