Results 21 to 30 of about 186,798 (170)

INCREASE: An updated model suite to study the INfluence of Cosmic Rays on Exoplanetary AtmoSpherEs

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract Exoplanets are as diverse as they are fascinating. They vary from ultrahot Jupiter‐like low‐density planets to presumed gas‐ice‐rock mixture worlds such as GJ 1214b or worlds as LHS 1140b, which features twice the Earth's bulk density. Regarding the great diversity of exoplanetary atmospheres, much remains to be explored.
Konstantin Herbst, John Lee Grenfell, Miriam Sinnhuber, Fabian Wunderlich   +3 more
wiley   +1 more source

The harsh environment where exoplanets live

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract The X‐ray and Extreme Ultraviolet (XUV) actvity of the Sun has determined important effects on the planets around it. In particular, high doses of X‐rays, flares, and coronal mass ejections (CMEs) combined with masses and sizes of the planets and the shielding action of the planetary magnetic fields have determined the diverse habitability of ...
Ignazio Pillitteri
wiley   +1 more source

Wide angle search for extrasolar planets by the transit method [PDF]

, 2008
The transit method is considered to be one of the most promising for discovering extrasolar planets. However, the method requires photometric precision of better than ∼ 1%.
Alsubai, Khalid
core   +2 more sources

The Origin of Earth's Mantle Nitrogen: Primordial or Early Biogeochemical Cycling?

Geochemistry, Geophysics, Geosystems, Volume 23, Issue 5, May 2022., 2022
Abstract Earth's mantle nitrogen (N) content is comparable to that found in its N‐rich atmosphere. Mantle N has been proposed to be primordial or sourced by later subduction, yet its origin has not been elucidated. Here we model N partitioning during the magma ocean stage following planet formation and the subsequent cycling between the surface and ...
H. Kurokawa, M. Laneuville, Y. Li, N. Zhang, Y. Fujii, H. Sakuraba, C. Houser, H. J. Cleaves II   +7 more
wiley   +1 more source

Detecting Solar System Analogs through Joint Radial Velocity/Astrometric Surveys

The Astronomical Journal, 2023
Earth-mass exoplanets on year-long orbits and cool gas giants (CGG) on decade-long orbits lie at the edge of current detection limits. The Terra Hunting Experiment (THE) will take nightly radial velocity (RV) observations on HARPS3 of at least 40 bright ...
Daniel A. Yahalomi, Ruth Angus, David N. Spergel, Daniel Foreman-Mackey   +3 more
doaj   +1 more source

The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256–1257 b

The Astrophysical Journal Letters, 2023
We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a
Brittany E. Miles, Beth A. Biller, Polychronis Patapis, Kadin Worthen, Emily Rickman, Kielan K. W. Hoch, Andrew Skemer, Marshall D. Perrin, Niall Whiteford, Christine H. Chen, B. Sargent, Sagnick Mukherjee, Caroline V. Morley, Sarah E. Moran, Mickael Bonnefoy, Simon Petrus, Aarynn L. Carter, Elodie Choquet, Sasha Hinkley, Kimberly Ward-Duong, Jarron M. Leisenring, Maxwell A. Millar-Blanchaer, Laurent Pueyo, Shrishmoy Ray, Steph Sallum, Karl R. Stapelfeldt, Jordan M. Stone, Jason J. Wang, Olivier Absil, William O. Balmer, Anthony Boccaletti, Mariangela Bonavita, Mark Booth, Brendan P. Bowler, Gael Chauvin, Valentin Christiaens, Thayne Currie, Camilla Danielski, Jonathan J. Fortney, Julien H. Girard, Carol A. Grady, Alexandra Z. Greenbaum, Thomas Henning, Dean C. Hines, Markus Janson, Paul Kalas, Jens Kammerer, Grant M. Kennedy, Matthew A. Kenworthy, Pierre Kervella, Pierre-Olivier Lagage, Ben W. P. Lew, Michael C. Liu, Bruce Macintosh, Sebastian Marino, Mark S. Marley, Christian Marois, Elisabeth C. Matthews, Brenda C. Matthews, Dimitri Mawet, Michael W. McElwain, Stanimir Metchev, Michael R. Meyer, Paul Molliere, Eric Pantin, Andreas Quirrenbach, Isabel Rebollido, Bin B. Ren, Glenn Schneider, Malavika Vasist, Mark C. Wyatt, Yifan Zhou, Zackery W. Briesemeister, Marta L. Bryan, Per Calissendorff, Faustine Cantalloube, Gabriele Cugno, Matthew De Furio, Trent J. Dupuy, Samuel M. Factor, Jacqueline K. Faherty, Michael P. Fitzgerald, Kyle Franson, Eileen C. Gonzales, Callie E. Hood, Alex R. Howe, Adam L. Kraus, Masayuki Kuzuhara, Anne-Marie Lagrange, Kellen Lawson, Cecilia Lazzoni, Pengyu Liu, Jorge Llop-Sayson, James P. Lloyd, Raquel A. Martinez, Johan Mazoyer, Sascha P. Quanz, Jea Adams Redai, Matthias Samland, Joshua E. Schlieder, Motohide Tamura, Xianyu Tan, Taichi Uyama, Arthur Vigan, Johanna M. Vos, Kevin Wagner, Schuyler G. Wolff, Marie Ygouf, Xi Zhang, Keming Zhang, Zhoujian Zhang   +110 more
doaj   +1 more source

Day–Night Transport-induced Chemistry and Clouds on WASP-39b: Gas-phase Composition

The Astrophysical Journal Letters, 2023
JWST has recently detected the first robust photochemical product on an exoplanet: sulfur dioxide (SO _2 ) on WASP-39b. The data from the NIRISS instrument also reveal signs of partial coverage of clouds.
Shang-Min Tsai, Julianne I. Moses, Diana Powell, Elspeth K. H. Lee   +3 more
doaj   +1 more source

Infrared transmission spectra for extrasolar giant planets [PDF]

, 2007
Among the hot Jupiters known to date that transit their parent stars, the two best candidates to be observed with transmission spectroscopy in the mid-infrared (MIR) are HD 189733b and HD 209458b, due to their combined characteristics of planetary ...
Vidal-Madjar, A., Ehrenreich, D., Liang, M.-O., Mao-chang Liang, Lecavelier Des Etangs, Alain, Yung, Yuk L., Giovanna Tinetti, Alain Lecavelier Des Etangs, Liang, Mao-Chang, Ehrenreich, David, Tinetti, G., Yung, Y.L., Tinetti, Giovanna, Alfred Vidal-madjar, Yuk L. Yung, David Ehrenreich, Vidal-Madjar, Alfred, Lecavelier des Etangs, A.   +17 more
core   +1 more source

Small Planets around Cool Dwarfs: Enhanced Formation Efficiency of Super-Earths around M Dwarfs

The Astrophysical Journal Letters, 2023
Current measurements of planet population as a function of stellar mass show three seemingly contradictory signatures: close-in super-Earths are more prevalent around M dwarfs than FGK dwarfs; inner super-Earths are correlated with outer giants; and ...
Yayaati Chachan, Eve J. Lee
doaj   +1 more source

Forming Gas Giants around a Range of Protostellar M-dwarfs by Gas Disk Gravitational Instability

The Astrophysical Journal, 2023
Recent discoveries of gas giant exoplanets around M-dwarfs from transiting and radial velocity surveys are difficult to explain with core-accretion models. We present here a homogeneous suite of 162 models of gravitationally unstable gaseous disks. These
Alan P. Boss, Shubham Kanodia
doaj   +1 more source