Results 11 to 20 of about 176,490 (172)

General circulation modelling of close-in extrasolar giant planets [PDF]

, 2011
PhDA large fraction of the extrasolar planets detected so far are giant planets that have such short orbital periods (a few days) that they are thought to be tidally-synchronised with the host star. Such orbits lead to permanent day/night sides on the
Thrastarson, Heidar Thor
core   +4 more sources

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

Superstoichiometric Alloying of H and Close‐Packed Fe‐Ni Metal Under High Pressures: Implications for Hydrogen Storage in Planetary Core

Geophysical Research Letters, Volume 50, Issue 5, 16 March 2023., 2023
Abstract Although high pressure enables alloying between hydrogen and iron, hydrogen‐to‐iron molar ratio (H/Fe) so far found in experiments is mostly limited to 1 in the close‐packed iron metal under high pressure. We report a H/(Fe + Ni) ratio of 1.8 ± 0.1 from (Fe,Ni)Hx (or x ≥ 1.8) quenched from liquid, exceeding the amounts so far reported for ...
Hélène Piet, Andrew Chizmeshya, Bin Chen, Stella Chariton, Eran Greenberg, Vitali Prakapenka, Peter Buseck, Sang‐Heon Shim   +7 more
wiley   +1 more source

On the application of machine learning in astronomy and astrophysics: A text‐mining‐based scientometric analysis

WIREs Data Mining and Knowledge Discovery, Volume 12, Issue 5, September/October 2022., 2022
This work presents a text‐mining‐based scientometric analysis of the scientific output in the last three decades regarding the use of artificial intelligence and machine learning in the fields of astronomy and astrophysics. Abstract Since the beginning of the 21st century, the fields of astronomy and astrophysics have experienced significant growth at ...
José‐Víctor Rodríguez, Ignacio Rodríguez‐Rodríguez, Wai Lok Woo   +2 more
wiley   +1 more source

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

Microlensing for extrasolar planets : improving the photometry [PDF]

, 2013
Gravitational Microlensing, as a technique for detecting Extrasolar Planets, is recognised for its potential in discovering small-mass planets similar to Earth, at a distance of a few Astronomical Units from their host stars.
Bajek, David J.
core   +2 more sources

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

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

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

Chemical and Dynamical Processes in the Atmospheres of I. Ancient and Present-Day Earth, II. Jupiter and Galileo Satellite, III. Extrasolar “Hot Jupiters” [PDF]

, 2006
When exposed to stellar UV radiation, chemical processes will be governed not only by temperature/pressure but also the spectrum of the incoming dissociative photon flux; the system will approach kinetic, or photochemical, equilibrium, instead of ...
Liang, Mao-Chang
core   +1 more source