Results 21 to 30 of about 9,753 (162)

Nonthermal Atmospheric Escape on the Kepler-11 “Super-Earths” Driven by Stellar Wind Sputtering

The Astrophysical Journal, 2023
Jeans escape or hydrodynamic escape is believed to dominate atmospheric loss for hot Jupiters. However, nonthermal mechanisms likely contribute substantially on hydrogen-rich “super-Earths” with relatively cold and extended atmospheres.
Hao Gu, Xiaoshu Wu, Xu Huang, Jianheng Guo, Jun Cui   +4 more
doaj   +1 more source

Evolution of a Water-rich Atmosphere Formed by a Giant Impact on an Earth-sized Planet

The Astrophysical Journal, 2023
The atmosphere of a terrestrial planet that is replenished with secondary gases should have accumulated hydrogen-rich gas from its protoplanetary disk.
Kenji Kurosaki, Yasunori Hori, Masahiro Ogihara, Masanobu Kunitomo   +3 more
doaj   +1 more source

Radial velocity eclipse mapping of exoplanets [PDF]

, 2015
Planetary rotation rates and obliquities provide information regarding the history of planet formation, but have not yet been measured for evolved extrasolar planets.
Barnes J. W., Correia A. C. M., Cowan N. B., Cox A. N., de Pater I., Faure G., Felix Sainsbury-Martinez, Fujii Y., Guillot T., Heller R., Hirano T., Hui L., Kataria T., Kawahara H., Kawahara H., Mandel K., Markwardt C. B., Murray C. D, Nikolay Nikolov, Ohta Y., Pallé E., Paz-Chinchón F., Seager S., Winn J. N.   +23 more
core   +2 more sources

Characterizing Habitable Extrasolar Planets using Spectral Fingerprints

, 2009
The detection and characterization of Earth-like planet is approaching rapidly thanks to radial velocity surveys (HARPS), transit searches (Corot, Kepler) and space observatories dedicated to their characterization are already in development phase (James
Kaltenegger, L., Selsis, F.
core   +3 more sources

Opening a new window to other worlds with spectropolarimetry [PDF]

, 2010
A high level of diversity has already been observed among the planets of our own Solar System. As such, one expects extrasolar planets to present a wide range of distinctive features, therefore the characterisation of Earth- and super Earth-like planets ...
A Léger, A Léger, Aleksandar Jaćimović, Alexander Reissner, Benjamin Toullec, C Braak, C O’Neill, CS Cockell, D Queloz, D Sudarsky, D Valencia, D Valencia, David Ludena, DD Sasselov, DM Stam, DM Stam, DM Williams, E Karkoschka, E Miller-Ricci, EE Bloemhof, ER Adams, F Delplancke, F Forget, F Joss, F Roddier, François Farago, GMHJ Habets, H Lammer, H Lammer, H Lammer, J Beuzit, J Christensen-Dalsgaard, J Hansen, J Kasting, J Kasting, J Schneider, JJ Lissauer, Johannes Bühl, L Kaltenegger, Lars Hunger, MA Mischna, Maren Mohler, Martina Meisnar, Meritxell Viñas Tió, ML Khodachenko, N Murakami, Nicolas Sarda, Nynne L. B. Lauritsen, O Guyon, P Bordé, PJ Bordé, R Barnes, S Ebisawa, S Seager, S Seager, S Seager, SC Unwin, Siegfried Eggl, SN Raymond, Stephen Doherty, V D’Odorico, Vera Theresa Eybl, WKJ Widger, Y Alibert, YN Kulikov   +64 more
core   +3 more sources

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

High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets [PDF]

, 2013
Recent observations of several planet-hosting M dwarfs show that most have FUV/NUV flux ratios 1000 times greater than that of the Sun. Here we show that the atmospheric oxygen contents (O2 and O3) of potentially habitable planets in this type of UV ...
France, Kevin, Linsky, Jeffrey L., Mauas, Pablo J. D., Tian, Feng, Vieytes, Mariela C.   +4 more
core   +2 more sources

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

TOI-1695 b: A Water World Orbiting an Early-M Dwarf in the Planet Radius Valley

The Astronomical Journal, 2023
Characterizing the bulk compositions of transiting exoplanets within the M dwarf radius valley offers a unique means to establish whether the radius valley emerges from an atmospheric mass-loss process or is imprinted by planet formation itself.
Collin Cherubim, Ryan Cloutier, David Charbonneau, Chris Stockdale, Keivan G. Stassun, Richard P. Schwarz, Boris Safonov, Annelies Mortier, Pablo Lewin, David W. Latham, Keith Horne, Raphaëlle D. Haywood, Erica Gonzales, Maria V. Goliguzova, Karen A. Collins, David R. Ciardi, Allyson Bieryla, Alexandre A. Belinski, Bill Wohler, Christopher A. Watson, Roland Vanderspek, Stéphane Udry, Alessandro Sozzetti, Damien Ségransan, Dimitar Sasselov, George R. Ricker, Ken Rice, Ennio Poretti, Giampaolo Piotto, Francesco Pepe, Emilio Molinari, Giuseppina Micela, Michel Mayor, Christophe Lovis, Mercedes López-Morales, Jon M. Jenkins, Zahra Essack, Xavier Dumusque, John P. Doty, Knicole D. Colón, Andrew Collier Cameron, Lars A. Buchhave   +41 more
doaj   +1 more source

A Framework for Quantifying the Degeneracies of Exoplanet Interior Compositions

, 2010
Several transiting super-Earths are expected to be discovered in the coming few years. While tools to model the interior structure of transiting planets exist, inferences about the composition are fraught with ambiguities.
Rogers, L. A., Seager, S.
core   +1 more source