Results 51 to 60 of about 1,575 (209)

Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-sized Exoplanet HD 106315c

, 2022
We present a transmission spectrum for the Neptune-sized exoplanet HD 106315c from optical to infrared wavelengths based on transit observations from the Hubble Space Telescope/Wide Field Camera 3, K2, and Spitzer.
Molliere, Paul, Schlieder, Joshua E., Kawashima, Yui Kawashima, Howell, Steve B., Krick, Jessica E. K, Weiss, Lauren M., Ciardi, David R., Mikal-Evans, Thomas, Greene, Thomas P., Howard, Andrew W., Livingston, John H., Crossfield, Ian J. M., Christiansen, Jessie L., Berardo, David, Lothringer, Joshua D., Isaacson, Howard, Kosiarek, Molly R., Morley, Caroline V., Dragomir, Diana, Thorngren, Daniel P., Morales, Farisa Y., Petigura, Erik A., Fulton, Benjamin J., Gorjian, Varoujan, Dressing, Courtney D., Hardegree-Ullman, Kevin K, Rodriguez, Joseph E., Fortney, Jonathan J., Kreidberg, Laura, Benneke, Björn   +29 more
core   +1 more source

Atmospheric C/O Ratios of Sub-Neptunes with Magma Oceans: Homemade rather than Inherited

The Astrophysical Journal Letters
Recently, the James Webb Space Telescope has enabled detailed spectroscopic characterization of sub-Neptune atmospheres. With detections of carbon- and oxygen-bearing species such as CO, CO _2 , CH _4 , and H _2 O, a central question is whether the ...
Aaron Werlen, Caroline Dorn, Hilke E. Schlichting, Simon L. Grimm, Edward D. Young   +4 more
doaj   +1 more source

Detection of Atmospheric Escape from Four Young Mini-Neptunes

The Astronomical Journal, 2023
We use Keck/NIRSPEC to survey a sample of of young (
Michael Zhang, Heather A. Knutson, Fei Dai, Lile Wang, George R. Ricker, Richard P. Schwarz, Christopher Mann, Karen Collins   +7 more
doaj   +1 more source

Predicting Nitrogen Isotope Fractionation in Nitrate Deposition on Early Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Noachian and early Hesperian Mars were likely warm and wet, with an atmosphere abundant in molecular nitrogen. The recent discovery of nitrate deposits in the Yellowknife Bay mudstones at Gale Crater confirm the existence of nitrogen oxides (NOX) on Noachian Mars. The processes responsible for the production of these nitrates would fractionate
J. Shawcross, D. J. Adams, M. L. Wong, K. J. Smith, Y. L. Yung   +4 more
wiley   +1 more source

The atmospheres of rocky exoplanets

Astronomy & Astrophysics
Context. The crust composition of rocky exoplanets with substantial atmospheres cannot be observed directly. However, recent developments have enabled novel observations and characterisations of their atmospheres. Aims. We aim to establish a link between observable spectroscopic atmospheric features and the mineralogical crust composition of exoplanets.
O. Herbort, L. Sereinig
openaire   +2 more sources

Sub-Neptunes Are Drier than They Seem: Rethinking the Origins of Water-rich Worlds

The Astrophysical Journal Letters
Recent claims of biosignature gases in sub-Neptune atmospheres have renewed interest in water-rich sub-Neptunes with surface oceans, often referred to as Hycean planets. These planets are hypothesized to form beyond the snow line, accreting large amounts
Aaron Werlen, Caroline Dorn, Remo Burn, Hilke E. Schlichting, Simon L. Grimm, Edward D. Young   +5 more
doaj   +1 more source

Atmospheric circulation of exoplanets

地球与行星物理论评, 2023
To date, more than 5000 exoplanets and more than 2000 brown dwarfs have been confirmed, which shows rich diversities in many aspects. With the rapid growth of the planet family, both observational and theoretical research on exoplanet atmosphere is ...
Yuchen Lian, Yongyun Hu
doaj   +1 more source

On the Detection of Low‐Frequency Planetary Radio Emission With an Orbiting Interferometer

Radio Science, Volume 61, Issue 6, June 2026.
Abstract The magnetized planets of the outer Solar System produce kilometric radio emissions at very low frequencies (<1 ${< } 1\,$MHz). They reveal the planetary magnetic dynamics and their interaction with the solar wind. Those radio emissions can also serve as a proxy for interplanetary space weather monitoring.
E. Rouillé, B. Cecconi, B. Segret, J. N. Girard, A. Loh   +4 more
wiley   +1 more source

The Effects of Non-ideal Mixing in Planetary Magma Oceans and Atmospheres

The Astrophysical Journal
Sub-Neptunes with hydrogen-rich envelopes are expected to sustain long-lived magma oceans that continuously exchange volatiles with their overlying atmospheres.
Aaron Werlen, Edward D. Young, Hilke E. Schlichting, Caroline Dorn, Anat Shahar   +4 more
doaj   +1 more source

Nitrogen as a Tracer of Giant Planet Formation. I. A Universal Deep Adiabatic Profile and Semianalytical Predictions of Disequilibrium Ammonia Abundances in Warm Exoplanetary Atmospheres

The Astrophysical Journal, 2023
A major motivation of spectroscopic observations of giant exoplanets is to unveil planet formation processes from atmospheric compositions. Several recent studies suggested that atmospheric nitrogen, like carbon and oxygen, can provide important ...
Kazumasa Ohno, Jonathan J. Fortney
doaj   +1 more source