Results 81 to 90 of about 9,607 (187)

Fleeting but Not Forgotten: The Imprint of Escaping Hydrogen Atmospheres on Super-Earth Interiors

The Astrophysical Journal
Small, close-in exoplanets are divided into two subpopulations: super-Earths and sub-Neptunes. Most super-Earths are thought to have lost their primordially accreted hydrogen-dominated atmospheres via thermally driven winds.
James G. Rogers, Hilke E. Schlichting, Edward D. Young   +2 more
doaj   +1 more source

A Cross‐Correlation Method to Evaluate Wind Retrieval Accuracy on Mars Using Simulated Microwave Limb Sounder Observations

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract While aspects such as the temperature and composition of the Martian atmosphere are relatively well known thanks to observations from numerous space missions, Martian atmospheric dynamics remain poorly constrained due to the scarcity of direct wind measurements. The use of microwave limb sounders to retrieve winds has been proposed in the past,
S. Jurado‐Fortuna, F. González‐Galindo, D. Shulyak, L. M. Lara   +3 more
wiley   +1 more source

Fractal Aggregate Aerosols in the Virga Cloud Code. II. Exploring the Effects of Key Cloud Parameters in Warm Neptune, Hot Jupiter and Brown Dwarf Atmospheres

The Astrophysical Journal
Aerosols and clouds are expected to be ubiquitous in exoplanet and brown dwarf atmospheres, where they can have a significant impact on transmission and emission spectra.
Matt G. Lodge, Sarah E. Moran, Hannah R. Wakeford, Zoë M. Leinhardt, Mark S. Marley   +4 more
doaj   +1 more source

Water, High-Altitude Condensates, and Possible Methane Depletion in the Atmosphere of the Warm Super-Neptune WASP-107b

, 2018
The super-Neptune exoplanet WASP-107b is an exciting target for atmosphere characterization. It has an unusually large atmospheric scale height and a small, bright host star, raising the possibility of precise constraints on its current nature and ...
Kreidberg, Laura, Line, Michael R., Morley, Caroline V., Stevenson, Kevin B., Thorngren, Daniel   +4 more
core   +1 more source

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source

Helium Depletion in Escaping Atmospheres of Sub-Neptunes: A Signature of Primary-to-secondary Transition

The Astrophysical Journal
Short-period sub-Neptunes are common in extrasolar systems. These sub-Neptunes are generally thought to have primary atmospheres of protoplanetary-disk gas origin.
Issei Kobayashi, Hiroyuki Kurokawa, Laura Schaefer, Satoshi Okuzumi   +3 more
doaj   +1 more source

The Need for Laboratory Measurements and Ab Initio Studies to Aid Understanding of Exoplanetary Atmospheres

, 2019
We are now on a clear trajectory for improvements in exoplanet observations that will revolutionize our ability to characterize their atmospheric structure, composition, and circulation, from gas giants to rocky planets.
Airapetian, Vladimir, Alam, Munazza, Arney, Giada, Ascenzi, Daniela, Batalha, Natalie, Batalha, Natasha, Benilan, Yves, Blecic, Jasmina, Bott, Kimberly, Bouwman, Jordy, Close, Laird, Del Genio, Anthony D., Deming, Drake, Desert, Jean-Michel, Domagal-Goldman, Shawn, Dong, Chuanfei, Dressing, Courtney, Drouin, Brian, Fauchez, Thomas, Fleury, Benjamin, Fortney, Jonathan J., Freedman, Richard, Gao, Peter, Gavilan, Lisseth, Gharib-Nezhad, Ehsan, Gizis, John, Gordon, Iouli E., Goyal, Jayesh, Gronoff, Guillaume, Gudipati, Murthy, Haghighipour, Nader, Hargreaves, Robert J., Henderson, Bryana, Horst, Sarah, Hu, Renyu, Huang, Xinchuan, Iro, Nicolas, Irwin, Patrick, Jensen-Clem, Rebecca, Johnson, Alexandria V, Kane, Stephen, Kao, Der-you, Karman, Tijs, Kempton, Eliza, Kitiashvili, Irina, Kreidberg, Laura, Krissansen-Totton, Joshua, Lee, Timothy, Lee, Timothy J., Lewis, Nikole, Line, Mike, Linnartz, Harold, Lopez-Morales, Mercedes, Lothringer, Joshua, Louden, Tom, Lupu, Roxana, Lustig-Yaeger, Jacob, Lyons, Timothy, Madhusudhan, Nikku, Mancini, Luigi, Marley, Mark S., Milam, Stefanie, Molaverdikhani, Karan, Molliere, Paul, Moses, Julianne, Pierrehumbert, Raymond, Ramirez, Ramses M., Rieker, Gregory B., Robinson, Tyler, Robinson, Tyler D., Rogers, Leslie, Rugheimer, Sarah, Rustamkulov, Zafar, Salama, Farid, Savin, Daniel Wolf, Schwieterman, Edward, Shkolnik, Evgenya, Sousa-Silva, Clara, Stevenson, Kevin, Sung, Keeyoon, Swain, Mark, Taylor, Jake, Tennyson, Jonathan, Turbet, Martin, Venot, Olivia, Wordsworth, Robin, Yurchenko, Sergei N, Zellem, Robert   +87 more
core  

Cation Disorder of Mg2SiO4 ${\text{Mg}}_{\mathbf{2}}{\text{SiO}}_{\mathbf{4}}$ in Super‐Earth Mantles

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Understanding the mineralogy of exoplanets is essential for unraveling their interior structures, dynamics, and evolution. For large super‐Earths, the post‐post spinel Mg2SiO4 ${\text{Mg}}_{2}{\text{SiO}}_{4}$, one of the major mantle phases, may undergo the order‐disorder transition (ODT) at high temperatures.
Donghao Zheng, Yifan Li, Yihang Peng, Rushi Gong, Zi‐Kui Liu, Jie Deng   +5 more
wiley   +1 more source

A Metal-poor Atmosphere with a Hot Interior for a Young Sub-Neptune Progenitor: JWST/NIRSpec Transmission Spectrum of V1298 Tau b

The Astronomical Journal
We present the JWST/NIRSpec G395H transmission spectrum of the young (10–30 Myr) transiting planet V1298 Tau b (9.85 ± 0.35 R _⊕ , T _eq  = 670 K). Combined Hubble Space Telescope and JWST observations reveal a haze-free, H/He-dominated atmosphere with a
Saugata Barat, Jean-Michel Désert, Sagnick Mukherjee, Jayesh M. Goyal, Qiao Xue, Yui Kawashima, Allona Vazan, William Misener, Hilke E. Schlichting, Jonathan J. Fortney, Jacob L. Bean, Swaroop Avarsekar, Gregory W. Henry, Robin Baeyens, Michael R. Line, John H. Livingston, Trevor David, Erik A. Petigura, James T. Sikora, Hinna Shivkumar, Adina D. Feinstein, Antonija Oklopčić   +21 more
doaj   +1 more source

Altitude Profile and Isotopic Composition for N2 From Pioneer Venus Mass Spectra

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract We report the highest resolution altitude profile and isotopic composition for N2 at Venus, to date. These results were obtained through re‐analysis of data acquired by the Pioneer Venus Large Probe Neutral Mass Spectrometer (LNMS). The N2 is non‐uniformly mixed across the clouds and sub‐cloud atmosphere (∼59–15 km) yet uniformly mixed across ...
R. Mogul, S. S. Limaye, M. J. Way
wiley   +1 more source