Atmospheric Reconnaissance of TRAPPIST-1 b with JWST/NIRISS: Evidence for Strong Stellar Contamination in the Transmission Spectra [PDF]
The Astrophysical Journal Letters, 2023 TRAPPIST-1 is a nearby system of seven Earth-sized, temperate, rocky exoplanets transiting a Jupiter-sized M8.5V star, ideally suited for in-depth atmospheric studies.
Olivia Lim +24 more
doaj +2 more sources
Symmetric Atom–Atom and Ion–Atom Processes in Stellar Atmospheres
Atoms, 2017 We present the results of the influence of two groups of collisional processes (atom–atom and ion–atom) on the optical and kinetic properties of weakly ionized stellar atmospheres layers.
Vladimir A. Srećković +2 more
doaj +2 more sources
High Tide or Riptide on the Cosmic Shoreline? A Water-rich Atmosphere or Stellar Contamination for the Warm Super-Earth GJ 486b from JWST Observations [PDF]
The Astrophysical Journal Letters, 2023 Planets orbiting M-dwarf stars are prime targets in the search for rocky exoplanet atmospheres. The small size of M dwarfs renders their planets exceptional targets for transmission spectroscopy, facilitating atmospheric characterization.
Sarah E. Moran +23 more
doaj +2 more sources
MPS-ATLAS Library of Stellar Model Atmospheres and Spectra [PDF]
Research Notes of the AAS, 2023 Stellar spectra contain a large amount of information about the conditions in stellar atmospheres. However, extracting this information is challenging and demands comprehensive numerical modeling.
N. Kostogryz +7 more
semanticscholar +1 more source
Effects of UV Stellar Spectral Uncertainty on the Chemistry of Terrestrial Atmospheres [PDF]
Astrophysical Journal, 2022 The upcoming deployment of the James Webb Space Telescope will dramatically advance our ability to characterize exoplanet atmospheres, both in terms of precision and sensitivity to smaller and cooler planets.
D. Teal +4 more
semanticscholar +1 more source
Stellar wind effects on the atmospheres of close-in giants: a possible reduction in escape instead of increased erosion [PDF]
Monthly notices of the Royal Astronomical Society, 2020 The atmospheres of highly irradiated exoplanets are observed to undergo hydrodynamic escape. However, due to strong pressures, stellar winds can confine planetary atmospheres, reducing their escape.
A. Vidotto, A. Cleary
semanticscholar +1 more source
Helium Absorption at 1083 nm from Extended Exoplanet Atmospheres: Dependence on Stellar Radiation [PDF]
Astrophysical Journal, 2019 Strong absorption signatures in the helium line at 1083 nm have recently been detected in transmission spectra of several close-in exoplanets. This absorption line originates from neutral helium atoms in an excited, metastable 23S state.
A. Oklopčić
semanticscholar +1 more source
MESAS: Measuring the Emission of Stellar Atmospheres at Submillimeter/millimeter Wavelengths [PDF]
Astrophysical Journal, 2018 In the early stages of planet formation, small dust grains grow to become millimeter-sized particles in debris disks around stars. These disks can in principle be characterized by their emission at submillimeter and millimeter wavelengths.
J. White +6 more
semanticscholar +1 more source
Intriguing Revelations from Lithium, Beryllium, and Boron
The Astrophysical Journal, 2023 This is a report on some highlights of research on the rare light elements, lithium (Li), beryllium (Be), and boron (B), that were presented at my Henry Norris Russell Lecture in 2020 January.
Ann Merchant Boesgaard
doaj +1 more source
A new extensive library of PHOENIX stellar atmospheres and synthetic spectra [PDF]
, 2013 Aims. We present a new library of high-resolution synthetic spectra based on the stellar atmosphere code PHOENIX that can be used for a wide range of applications of spectral analysis and stellar parameter synthesis. Methods.
T. Husser +6 more
semanticscholar +1 more source