Results 111 to 120 of about 8,850 (191)

Global Chemical Transport on Hot Jupiters: Insights from the 2D VULCAN Photochemical Model

The Astrophysical Journal
The atmospheric dynamics of tidally locked hot Jupiters is characterized by strong equatorial winds. Understanding the interaction between global circulation and chemistry is crucial in atmospheric studies and interpreting observations.
Shang-Min Tsai, Vivien Parmentier, João M. Mendonça, Xianyu Tan, Russell Deitrick, Mark Hammond, Arjun B. Savel, Xi Zhang, Raymond T. Pierrehumbert, Edward W. Schwieterman   +9 more
doaj   +1 more source

A Photochemical Phosphorus-Hydrogen-Oxygen Network for Hydrogen-dominated Exoplanet Atmospheres

The Astrophysical Journal
Due to the detection of phosphine (PH _3 ) in the solar system gas giants Jupiter and Saturn, PH _3 has long been suggested to be detectable in exosolar substellar atmospheres too.
Elspeth K. H. Lee, Shang-Min Tsai, Julianne I. Moses, John M. C. Plane, Channon Visscher, Stephen J. Klippenstein   +5 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

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

Atmospheric Chemistry of Secondary and Hybrid Atmospheres of Super Earths and Sub-Neptunes

The Astrophysical Journal
The atmospheres of small exoplanets likely derive from a combination of geochemical outgassing and primordial gases left over from formation. Secondary atmospheres, such as those of Earth, Mars, and Venus, are sourced by outgassing. Persistent outgassing
Meng Tian, Kevin Heng
doaj   +1 more source

Strong Fractionation of Deuterium and Helium in Sub-Neptune Atmospheres along the Radius Valley

The Astrophysical Journal
We simulate atmospheric fractionation in escaping planetary atmospheres using IsoFATE , a new open-source numerical model. We expand the parameter space studied previously to planets with tenuous atmospheres that exhibit the greatest helium and deuterium
Collin Cherubim, Robin Wordsworth, Renyu Hu, Evgenya Shkolnik   +3 more
doaj   +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

Testing the Origin of Hot Jupiters with Atmospheric Surveys

The Astrophysical Journal
In spite of their long detection history, the origin of hot Jupiters remains to be resolved. While dynamical evidence suggests high-eccentricity migration is most likely, conflicts remain when considering hot Jupiters as a population in the context of ...
Lina D’Aoust, Ben Coull-Neveu, Eve J. Lee, Nicolas B. Cowan   +3 more
doaj   +1 more source