Results 71 to 80 of about 8,946 (200)

State‐Dependence of Polar Amplification in an Idealized GCM

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Polar amplification (PA) is a robust feature of contemporary climate change, but its state‐dependence across different climate conditions is poorly understood despite potential relevance to paleoclimate records and future projections. Here we examine the state‐dependence of PA across a wide range of climate states in an idealized moist general
Andrew I. L. Williams, Timothy M. Merlis
wiley   +1 more source

Constraining Atmospheric Composition from the Outflow: Helium Observations Reveal the Fundamental Properties of Two Planets Straddling the Radius Gap

The Astronomical Journal
TOI-836 is a ∼2–3 Gyr K dwarf with an inner super Earth ( R  = 1.7 R _⊕ , P = 3.8 days) and an outer mini-Neptune ( R  = 2.6 R _⊕ , P = 8.6 days). JWST/NIRSpec 2.8–5.2 μ m transmission spectra are flat for both planets.
Michael Zhang, Jacob L. Bean, David Wilson, Girish Duvvuri, Christian Schneider, Heather A. Knutson, Fei Dai, Karen A. Collins, Cristilyn N. Watkins, Richard P. Schwarz, Khalid Barkaoui, Avi Shporer, Keith Horne, Ramotholo Sefako, Felipe Murgas, Enric Palle   +15 more
doaj   +1 more source

Nitrogen as a Tracer of Giant Planet Formation. II. Comprehensive Study of Nitrogen Photochemistry and Implications for Observing NH3 and HCN in Transmission and Emission Spectra

The Astrophysical Journal, 2023
Atmospheric nitrogen may provide important constraints on giant planet formation. Following our semianalytical work, we further pursue the relation between observable NH _3 and an atmosphere’s bulk nitrogen abundance by applying the photochemical ...
Kazumasa Ohno, Jonathan J. Fortney
doaj   +1 more source

Radiative Transfer for Exoplanet Atmospheres

, 2017
Remote sensing of the atmospheres of distant worlds motivates a firm understanding of radiative transfer. In this review, we provide a pedagogical cookbook that describes the principal ingredients needed to perform a radiative transfer calculation and ...
A Burrows, A Burrows, A Burrows, A Burrows, A Schuster, AA Lacis, AP Showman, BT Draine, C Goukenleuque, Ch Helling, CM Sharp, CP McKay, CV Morley, D Kitzmann, D Mihalas, D Mihalas, D Sudarsky, D Sudarsky, DK Sing, DS Spiegel, DS Spiegel, E Miller-Ricci, F Allard, F Allard, F Zeggeren van, G Tinetti, HW Barker, I Baraffe, I Hubeny, I Hubeny, I Hubeny, I Hubeny, J Tennyson, J Tennyson, JE Hansen, JI Moses, JJ Fortney, JJ Fortney, JJ Fortney, JN Cuzzi, K Heng, K Heng, K Heng, K Heng, K Heng, K Heng, K Heng, K Liou, K Liou, K Lodders, KJ Zahnle, KL Cahoy, LS Rothman, LS Rothman, M Malik, MS Marley, MS Marley, MS Marley, MS Marley, MS Marley, MS Marley, N Iro, N Madhusudhan, N Madhusudhan, OB Toon, P Mollière, R Goody, RL Kurucz, RS Freedman, RS Freedman, S Chandrasekhar, S Seager, S Seager, S Seager, S-M Tsai, SL Grimm, TD Robinson, TM Brown, TM Evans, TS Barman, WB Hubbard, WE Meador   +81 more
core   +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

Overcast Mornings and Clear Evenings in Hot Jupiter Exoplanet Atmospheres

The Astrophysical Journal Letters
Aerosols are an old topic in the young field of exoplanet atmospheres. Understanding what they are, how they form, and where they go has long provided a fertile playground for theorists.
Guangwei Fu, Sagnick Mukherjee, Kevin B. Stevenson, David K. Sing, Reza Ashtari, Nathan Mayne, Joshua D. Lothringer, Maria Zamyatina, Stephen P. Schmidt, Carlos Gascón, Natalie H. Allen, Katherine A. Bennett, Mercedes López-Morales   +12 more
doaj   +1 more source

A Temperature and Abundance Retrieval Method for Exoplanet Atmospheres

, 2009
We present a new method to retrieve molecular abundances and temperature profiles from exoplanet atmosphere photometry and spectroscopy. We run millions of 1D atmosphere models in order to cover the large range of allowed parameter space, and present ...
Madhusudhan, N., Seager, S.
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

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

The Compositions of the HR 8799 Planets Reflect Accretion of Both Solids and Metal-enriched Gas

The Astrophysical Journal
With four giant planets ( m  ∼ 5 M _Jup −10 M _Jup , T _eff  ∼ 900–1200 K) orbiting between 15 and 70 au, HR 8799 provides an unparalleled test bed for studying giant planet formation and probing compositional trends across the protoplanetary disk.
Jerry W. Xuan, Jean-Baptiste Ruffio, Yayaati Chachan, Kazumasa Ohno, Aurora Kesseli, Ruth Murray-Clay, Eve J. Lee, Julianne I. Moses, William O. Balmer, Aneesh Baburaj, Geoffrey A. Blake, Doug Johnstone, Yapeng Zhang, Heather A. Knutson, Dimitri Mawet, Charles Beichman, Klaus Hodapp, Marshall D. Perrin, Quinn Konopacky, Michael Meyer, Geoffrey Bryden, Thomas P. Greene, Jarron Leisenring, Marie Ygouf, Björn Benneke, Julie Inglis, Nicole L. Wallack   +26 more
doaj   +1 more source