Results 111 to 120 of about 59,298 (206)

Characterizing Exoplanetary Atmospheres: New Views on Exoplanet Composition and Chemistry

To appear in the proceedings of the Pontifical Academy of Science workshop on The James Webb Space Telescope: from first light to new worldviews, Vatican City, 27-29 February ...
openaire   +2 more sources

Polycyclic Aromatic Hydrocarbons as an Extraterrestrial Atmospheric Technosignature

The Planetary Science Journal
Polycyclic aromatic hydrocarbons (PAHs) are prevalent in the Universe and interstellar medium but are primarily attributed to anthropogenic sources on Earth, such as fossil fuel combustion and firewood burning.
Dwaipayan Dubey, Ravi Kopparapu, Barbara Ercolano, Karan Molaverdikhani   +3 more
doaj   +1 more source

A JWST Panchromatic Thermal Emission Spectrum of the Warm Neptune Archetype GJ 436b

The Astrophysical Journal Letters
GJ 436b is the archetype warm Neptune exoplanet. The planet’s thermal emission spectrum was previously observed via intensive secondary eclipse campaigns with Spitzer.
Sagnick Mukherjee, Everett Schlawin, Taylor J. Bell, Jonathan J. Fortney, Thomas G. Beatty, Thomas P. Greene, Kazumasa Ohno, Matthew M. Murphy, Vivien Parmentier, Michael R. Line, Luis Welbanks, Lindsey S. Wiser, Marcia J. Rieke   +12 more
doaj   +1 more source

A Possible Metal-dominated Atmosphere below the Thick Aerosols of GJ 1214 b Suggested by Its JWST Panchromatic Transmission Spectrum

The Astrophysical Journal Letters
GJ 1214b is the archetype sub-Neptune for which thick aerosols have prevented us from constraining its atmospheric properties for over a decade. In this study, we leverage the panchromatic transmission spectrum of GJ 1214b established by the Hubble Space
Kazumasa Ohno, Everett Schlawin, Taylor J. Bell, Matthew M. Murphy, Thomas G. Beatty, Luis Welbanks, Thomas P. Greene, Jonathan J. Fortney, Vivien Parmentier, Isaac R. Edelman, Nishil Mehta, Marcia J. Rieke   +11 more
doaj   +1 more source

Habitability of an exoplanet based on stellar wind

Theoretical and Natural Science
This paper aims to investigate the influence of stellar winds on the atmosphere of exoplanets. Stellar winds, which consist of charged particles produced by stars, can heavily alter and affect the evolution and composition of exoplanet atmospheres.
Changseok Lee
semanticscholar   +1 more source

Biogenic Sulfur Gases as Biosignatures on Temperate Sub-Neptune Waterworlds

The Astrophysical Journal Letters
Theoretical predictions and observational data indicate a class of sub-Neptune exoplanets may have water-rich interiors covered by hydrogen-dominated atmospheres.
Shang-Min Tsai, Hamish Innes, Nicholas F. Wogan, Edward W. Schwieterman   +3 more
doaj   +1 more source

The Impact of Cometary “Impacts” on the Chemistry, Climate, and Spectra of Hot Jupiter Atmospheres

The Astrophysical Journal
Impacts from icy and rocky bodies have helped shape the composition of Solar System objects; for example, the Earth–Moon system, or the recent impact of comet Shoemaker–Levy 9 with Jupiter.
F. Sainsbury-Martinez, C. Walsh
doaj   +1 more source

The Atmosphere of HD 149026b: Low Metal Enrichment and Weak Energy Transport

The Astrophysical Journal
Recent JWST eclipse spectra of the high-density hot Saturn HD 149026b between 2.35 and 5.08 μ m have allowed for in-depth study of its atmosphere. To understand its atmospheric properties, we have created a grid of 1D radiative-convective–thermochemical ...
Anna Gagnebin, Sagnick Mukherjee, Jonathan J. Fortney, Natasha E. Batalha   +3 more
doaj   +1 more source

JWST/NIRISS Reveals the Water-rich “Steam World” Atmosphere of GJ 9827 d

The Astrophysical Journal Letters
With sizable volatile envelopes but smaller radii than the solar system ice giants, sub-Neptunes have been revealed as one of the most common types of planet in the galaxy. While the spectroscopic characterization of larger sub-Neptunes (2.5–4 R _⊕ ) has
Caroline Piaulet-Ghorayeb, Björn Benneke, Michael Radica, Eshan Raul, Louis-Philippe Coulombe, Eva-Maria Ahrer, Daria Kubyshkina, Ward S. Howard, Joshua Krissansen-Totton, Ryan J. MacDonald, Pierre-Alexis Roy, Amy Louca, Duncan Christie, Marylou Fournier-Tondreau, Romain Allart, Yamila Miguel, Hilke E. Schlichting, Luis Welbanks, Charles Cadieux, Caroline Dorn, Thomas M. Evans-Soma, Jonathan J. Fortney, Raymond Pierrehumbert, David Lafrenière, Lorena Acuña, Thaddeus Komacek, Hamish Innes, Thomas G. Beatty, Ryan Cloutier, René Doyon, Anna Gagnebin, Cyril Gapp, Heather A. Knutson   +32 more
doaj   +1 more source

Can Isotopologues Be Used as Biosignature Gases in Exoplanet Atmospheres? [PDF]

Life (Basel), 2023
Glidden A, Seager S, Petkowski JJ, Ono S.   +3 more
europepmc   +1 more source