Results 71 to 80 of about 19,828 (210)

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

Commissioning an Inexpensive Off‐The‐Shelf Spectrograph for Radial‐Velocity Studies

Astronomische Nachrichten, Volume 347, Issue 2, February 2026.
ABSTRACT We present a way to set up an inexpensive out of the shelf spectrograph at a local observatory. Stability and resolution of the spectrograph are high enough for radial velocity determination of binary stars or determination of stellar characteristics. Even some exoplanets might be detectable via the radial velocity method.
Lukas Stock, Andreas Schrimpf
wiley   +1 more source

Deep Limits on Planets Exterior to HR 8799’s Known Planetary System with the James Webb Space Telescope

The Astronomical Journal
We observed the HR 8799 planetary system with JWST’s NIRCam instrument using its F356W and F444W filters to search for additional, lower-mass planets that might reside between or exterior to the four previously detected Jovian-mass planets.
Bryden Geoffrey, Llop-Sayson Jorge, Beichman Charles A., Balmer William O., Kammerer Jens, Leisenring Jarron M., Ygouf Marie, Krist John, Faramaz-Gorka Virginie, Greenbaum Alexandra Z., Girard Julien, Perrin Marshall, Pueyo Laurent, van der Marel Roeland, Meyer Michael, Johnstone Doug, Hodapp Klaus, Rieke Marcia   +17 more
doaj   +1 more source

Galactic Cosmic Ray Ionization on Uranus; Geomagnetic Latitude Dependencies

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract Galactic Cosmic Rays (GCRs) are a major source of atmospheric ionization, influencing ion abundance, aerosol formation, and electrical processes. GCR‐induced effects are expected to be more pronounced on Uranus than planets closer to the Sun for two reasons; reduced solar irradiance, and weaker solar modulation of incident GCR.
Ola Al‐Khuraybi, Karen L. Aplin, Alberto Gambaruto   +2 more
wiley   +1 more source

Detectors and cooling technology for direct spectroscopic biosignature characterization

, 2016
Direct spectroscopic biosignature characterization (hereafter "biosignature characterization") will be a major focus for future space observatories equipped with coronagraphs or starshades.
Canavan, Edgar R., Moseley, S. H., Rauscher, Bernard J., Sadleir, John E., Stevenson, Thomas   +4 more
core   +1 more source

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

The PEPSI Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy

The Astronomical Journal, 2023
Recent observations have shown that the atmospheres of ultrahot Jupiters (UHJs) commonly possess temperature inversions, where the temperature increases with increasing altitude.
Marshall C. Johnson, Ji Wang, Anusha Pai Asnodkar, Aldo S. Bonomo, B. Scott Gaudi, Thomas Henning, Ilya Ilyin, Engin Keles, Luca Malavolta, Matthias Mallonn, Karan Molaverdikhani, Valerio Nascimbeni, Jennifer Patience, Katja Poppenhaeger, Gaetano Scandariato, Everett Schlawin, Evgenya Shkolnik, Daniela Sicilia, Alessandro Sozzetti, Klaus G. Strassmeier, Christian Veillet, Fei Yan   +21 more
doaj   +1 more source

Aggregate Hazes in Exoplanet Atmospheres [PDF]

, 2019
Photochemical hazes have been frequently used to interpret exoplanet transmission spectra that show an upward slope towards shorter wavelengths and weak molecular features.
Adams, Danica, de Pater, Imke, Gao, Peter, Morley, Caroline   +3 more
core   +3 more sources

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

Amplifying Resonant Repulsion with Inflated Young Planets, Overlooked Inner Planets, and Nonzero Initial Δ

The Astrophysical Journal
Most multiplanet systems around mature (∼5 Gyr old) host stars are nonresonant. Even the near-resonant planet pairs still display 1%–2% positive deviation from perfect period commensurabilities (Δ) near first-order mean motion resonances (MMRs). Resonant
Yuancheng Xu, Fei Dai
doaj   +1 more source