Results 11 to 20 of about 1,870,265 (176)

Influence of stellar variability on the determination of the radius during a transit of an exoplanet

EPJ Web of Conferences, 2011
Stellar variability can affect the estimate of an exoplanet radius measured during a transit. We developed a transit light curve model which includes stellar spots.
Désert J.-M., Lecavelier des Etangs A., Parmentier V., Sing D.   +3 more
doaj   +3 more sources

Studying the variability of the He triplet to understand the detection limits of evaporating exoplanet atmospheres

Astronomy & Astrophysics
With more than a dozen significant detections, the helium triplet has emerged as a key tracer of evaporating exoplanet atmospheres. This near-infrared feature can be observed from the ground and holds great promise, especially with upcoming observations provided by new-generation instruments such as the Near Infrared Planet Searcher (NIRPS).
Mercier, Samson Jules, Dumusque, Xavier, Bourrier, Vincent, Al Moulla, Khaled Sleiman, Cretignier, Michaël, Dethier, William, Lo Curto, Gaspare, Figueira, Pedro Ricardo, Lovis, Christophe, Pepe, Francesco Alfonso, Santos, Nuno C., Udry, Stéphane, Wildi, François, Allart, Romain, Baron, Frédérique, Bouchy, François, Carmona, Andres, Cointepas, Marion, Doyon, René, Frensch, Yolanda Gerardina Cécile, Grieves, Nolan, Mignon, Lucile, Nielsen, Louise Dyregaard   +22 more
openaire   +4 more sources

Variable Irradiation on 1D Cloudless Eccentric Exoplanet Atmospheres [PDF]

The Astrophysical Journal, 2021
Abstract Exoplanets on eccentric orbits experience an incident stellar flux that can be markedly larger at periastron versus apoastron. This variation in instellation can lead to dramatic changes in atmospheric structure in regions of the atmosphere where the radiative and advective heating/cooling timescales are shorter than the orbital
L. C. Mayorga, Tyler D. Robinson, Mark S. Marley, E. M. May, Kevin B. Stevenson   +4 more
openaire   +2 more sources

Effect of Laboratory Reagents for Cleaning Modern Contamination on the δ¹⁵N Integrity of Nitrogen-Poor Samples. [PDF]

Rapid Commun Mass Spectrom
ABSTRACT Rationale Nitrogen isotope values have been widely used for tracing ancient biogeochemical processes, but contaminant‐sensitive materials, such as Precambrian sedimentary rocks, meteorites, or returned extraterrestrial samples, often have low nitrogen levels and are thus vulnerable to modern organic contamination.
Bubphamanee K, Schauer A, Buick R.
europepmc   +2 more sources

Earth as an Exoplanet. II. Earth’s Time-variable Thermal Emission and Its Atmospheric Seasonality of Bioindicators [PDF]

The Astrophysical Journal, 2023
Abstract We assess the dependence of Earth’s disk-integrated mid-infrared thermal emission spectrum on observation geometries and investigate which and how spectral features are impacted by seasonality on Earth. We compiled an exclusive data set containing 2690 disk-integrated thermal emission spectra for four different full-disk ...
Mettler, Jean-Noël, Quanz, Sascha P, Helled, Ravit, Olson, Stephanie L, Schwieterman, Edward W   +4 more
openaire   +5 more sources

A Catalog of Exoplanet Atmospheric Retrieval Codes [PDF]

, 2023
Exoplanet atmospheric retrieval is a computational technique widely used to infer properties of planetary atmospheres from remote spectroscopic observations.
Ryan J. MacDonald, Natasha E. Batalha, MacDonald, Ryan J., Batalha, Natasha E.   +3 more
core   +2 more sources

General circulation modelling of close-in extrasolar giant planets [PDF]

, 2011
PhDA large fraction of the extrasolar planets detected so far are giant planets that have such short orbital periods (a few days) that they are thought to be tidally-synchronised with the host star. Such orbits lead to permanent day/night sides on the
Thrastarson, Heidar Thor
core   +4 more sources

Reassessing the Evidence for Time Variability in the Atmosphere of the Exoplanet HAT-P-7 b

The Astronomical Journal, 2022
Abstract We reassess the claimed detection of variability in the atmosphere of the hot Jupiter HAT-P-7 b, reported by Armstrong et al. Although astronomers expect hot Jupiters to have changing atmospheres, variability is challenging to detect.
Maura Lally, Andrew Vanderburg
openaire   +3 more sources

Impact of variable photospheric radius on exoplanet atmospheric retrievals

Monthly Notices of the Royal Astronomical Society: Letters, 2022
ABSTRACT Inverse techniques are used to extract information about an exoplanet’s atmosphere. These techniques are prone to biased results if the appropriate forward model is not used. One assumption used in a forward model is to assume that the radius of the planet is constant with wavelength; however, a more realistic assumption is that
openaire   +2 more sources

exoplanet-dev/exoplanet: exoplanet v0.4.5

, 2021
0.5.0 (2021-05-04) Adds high-level, pure-Theano/Aesara implementation of RegularGridInterpolator to replace compiled version #167 Moves compiled Ops to exoplanet-core making exoplanet a pure-Python package #171 Moves ReboundOp and ReboundOrbit to ...
emilygilbert, Dan Foreman-Mackey, Eric Agol, Christina Hedges, Tom Barclay, Ian Czekala, Luke Bouma, Rodrigo Luger, Adrian Price-Whelan, Timothy D Brandt, Arjun Savel   +10 more
core   +1 more source