Results 1 to 10 of about 58,318 (156)

Patchy Forsterite Clouds in the Atmospheres of Two Highly Variable Exoplanet Analogs [PDF]

The Astrophysical Journal, 2023
We present an atmospheric retrieval analysis of a pair of highly variable, ∼200 Myr old, early T type planetary-mass exoplanet analogs SIMP J01365662+0933473 and 2MASS J21392676+0220226 using the Brewster retrieval framework.
Johanna M. Vos, Ben Burningham, Jacqueline K. Faherty, Sherelyn Alejandro, Eileen Gonzales, Emily Calamari, Daniella Bardalez Gagliuffi, Channon Visscher, Xianyu Tan, Caroline V. Morley, Mark Marley, Marina E. Gemma, Niall Whiteford, Josefine Gaarn, Grace Park   +14 more
doaj   +4 more sources

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

The Astrophysical Journal, 2022
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.
Jean-Noël Mettler, S. Quanz, R. Helled, S. Olson, E. Schwieterman   +4 more
semanticscholar   +7 more sources

Earth as an Exoplanet: Investigating the Effects of Cloud Variability on the Direct-imaging of Atmospheres [PDF]

The Planetary Science Journal
A planet’s spectrum is dynamic and only represents a time-dependent snapshot of its properties. Changing atmospheric conditions due to climate and weather patterns, particularly variation in cloud cover, can significantly affect the spectrum in ways that
Soumil Kelkar, Prabal Saxena, R. Kopparapu, J. Monteiro   +3 more
semanticscholar   +4 more sources

A Blind Search for Transit Depth Variability with TESS [PDF]

The Astronomical Journal, 2023
The phenomenon of transit depth variability offers a pathway through which processes such as exoplanet atmospheric activity and orbital dynamics can be studied.
Gavin Wang, Néstor Espinoza
doaj   +2 more sources

Exoplanet Aeronomy: A Case Study of WASP-69 b’s Variable Thermosphere [PDF]

The Astronomical Journal
Aeronomy, the study of Earth’s upper atmosphere and its interaction with the local space environment, has long traced changes in the thermospheres of Earth and other solar system planets to solar variability in the X-ray and extreme-ultraviolet ...
W. Garrett Levine, Shreyas Vissapragada, Adina D. Feinstein, George W. King, Aleck Hernandez, Lía Corrales, Michael Greklek-McKeon, Heather A. Knutson   +7 more
doaj   +2 more sources

Radiative Flux from a High-resolution Atmospheric Dynamics Simulation of a Hot Jupiter for JWST and Ariel [PDF]

The Astrophysical Journal
We present medium-wave (∼0.5–13 μ m) radiative flux distributions and spectra derived from high-resolution atmospheric dynamics simulations of an exoplanet, WASP-121 b. This planet serves to illustrate several important features.
Jagat Kafle, James Y-K. Cho, Quentin Changeat   +2 more
doaj   +2 more sources

The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-dependent Variability Driven by Multiple Mechanisms [PDF]

The Astrophysical Journal Letters
Isolated planetary-mass objects share their mass range with planets but do not orbit a star. They lack the necessary mass to support fusion in their cores and thermally radiate their heat from formation as they cool, primarily at infrared wavelengths ...
Allison M. McCarthy, Johanna M. Vos, Philip S. Muirhead, Beth A. Biller, Caroline V. Morley, Jacqueline Faherty, Ben Burningham, Emily Calamari, Nicolas B. Cowan, Kelle L. Cruz, Eileen Gonzales, Mary Anne Limbach, Pengyu Liu, Evert Nasedkin, Genaro Suárez, Xianyu Tan, Cian O’Toole, Channon Visscher, Niall Whiteford, Yifan Zhou   +19 more
doaj   +2 more sources

Mapping the Cloud-driven Atmospheric Dynamics and Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures [PDF]

The Astronomical Journal
Young planetary-mass objects and brown dwarfs near the L–T spectral transition exhibit enhanced spectrophotometric variability over field brown dwarfs. Patchy clouds, auroral processes, stratospheric hot spots, and complex carbon chemistry have all been ...
Michael K. Plummer, Francis P. Cocchini, Peter A. Kearns, Allison M. McCarthy, Étienne Artigau, Nicolas B. Cowan, Roman Akhmetshyn, Johanna M. Vos, Evert Nasedkin, Channon Visscher, Björn Benneke, René Doyon, Stanimir A. Metchev, Jason F. Rowe, Genaro Suárez   +14 more
doaj   +2 more sources

Variability of Known Exoplanet Host Stars Observed by TESS

The Astronomical Journal, 2023
Both direct and indirect methods of exoplanet detection rely upon detailed knowledge of the potential host stars. Such stellar characterization allows for accurate extraction of planetary properties, as well as contributing to our overall understanding ...
Emilie R. Simpson, Tara Fetherolf, Stephen R. Kane, Joshua Pepper, Teo Močnik, Paul A. Dalba   +5 more
doaj   +2 more sources

Far-ultraviolet Flares and Variability of the Young M Dwarf AU Mic: A Nondetection of Planet C in Transit at Lyα [PDF]

The Astronomical Journal
Atmospheric escape’s potential to shape the exoplanet population motivates detailed observations of systems actively undergoing escape. AU Mic is a young and active M dwarf hosting two close-in transiting sub- to Neptune-sized planets. Atmospheric escape
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood, Girish M. Duvvuri, Emily A. Gilbert, Peter Plavchan, Peter Gao, Hans-R. Müller, Adina D. Feinstein, Thomas Barclay, Eric D. Lopez   +10 more
doaj   +2 more sources