Results 31 to 40 of about 13,757 (226)
Atmospheric Seasonality as an Exoplanet Biosignature [PDF]
The Astrophysical Journal Letters, 2018 Abstract Current investigations of exoplanet biosignatures have focused on static evidence of life, such as the presence of biogenic gases like O2 or CH4. However, the expected diversity of terrestrial planet atmospheres and the likelihood of both “false positives” and “false negatives” for conventional biosignatures motivate exploration
Victoria S. Meadows +12 more
openaire +6 more sources
Exoplanet secondary atmosphere loss and revival [PDF]
Proceedings of the National Academy of Sciences, 2020 SignificanceEarth and Venus have significant atmospheres, but Mercury does not. Thousands of exoplanets are known, but we know almost nothing about rocky exoplanet atmospheres. Many rocky exoplanets were formed by a sub-Neptune-to-super-Earth conversion process during which planets lose most of their H2-rich (primary) atmospheres and are reduced in ...
Edwin S. Kite, Megan Barnett
openalex +5 more sources
A Multiple Scattering Polarized Radiative Transfer Model: Application to HD 189733b [PDF]
, 2015 We present a multiple scattering vector radiative transfer model which produces disk integrated, full phase polarized light curves for reflected light from an exoplanetary atmosphere.
Kopparla, Pushkar +5 more
core +2 more sources
Ranges of Atmospheric Mass and Composition of Super Earth Exoplanets [PDF]
, 2008 Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity.
Burbine T. H. +5 more
core +1 more source
Physics Today, 2013 Twenty years ago planets orbiting faraway stars were the stuff of science fiction. Now their atmospheric composition and even their weather are being revealed by sensitive spectral measurements.
openaire +3 more sources
Exoplanet albedo spectra and colors as a function of planet phase, separation, and metallicity [PDF]
, 2010 First generation optical coronagraphic telescopes will obtain images of cool gas and ice giant exoplanets around nearby stars. The albedo spectra of exoplanets at planet-star separations larger than about 1 AU are dominated by reflected light to beyond 1
Ackerman +58 more
core +2 more sources
Aggregate Hazes in Exoplanet Atmospheres [PDF]
The Astrophysical Journal, 2019 Abstract Photochemical hazes have frequently been used to interpret exoplanet transmission spectra that show an upward slope toward shorter wavelengths and weak molecular features. While previous studies have only considered spherical haze particles, photochemical hazes composed of hydrocarbon aggregate particles are common throughout ...
Imke de Pater +4 more
openaire +6 more sources
High-resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b
The Astronomical Journal, 2023 Terrestrial exoplanets orbiting M-dwarf stars are promising targets for transmission spectroscopy with existing or near-future instrumentation. The atmospheric composition of such rocky planets remains an open question, especially given the high X-ray ...
Andrew Ridden-Harper +13 more
doaj +1 more source
Exoplanet Characterization by Multi-Observatory Transit Photometry with TESS and CHEOPS [PDF]
, 2017 Space-based photometric surveys have discovered large numbers of planets transiting other stars, but these observe in a single band-pass and yield only the planet radius, orbital period, and transit duration.
Gaidos, E., Heng, K., Kitzmann, D.
core +2 more sources
The Sensitivity of Eclipse Mapping to Planetary Rotation
The Astronomical Journal, 2022 Mapping exoplanets across phases and during secondary eclipse is a powerful technique for characterizing Hot Jupiters in emission. Since these planets are expected to rotate about axes normal to their orbital planes, with rotation periods synchronized ...
Arthur D. Adams, Emily Rauscher
doaj +1 more source