Results 91 to 100 of about 2,690,574 (274)

A Population of Very-Hot Super-Earths in Multiple-Planet Systems Should be Uncovered by Kepler

, 2010
We simulate a Kepler-like observation of a theoretical exoplanet population and we show that the observed orbital period distribution of the Kepler giant planet candidates is best matched by an average stellar specific dissipation function Q_* in the ...
Batalha, Batalha, Borucki, Bryson, Caldwell, Dobbs-Dixon, Ford, Fortney, Gu, Haas, Ibgui, Ida, Ida, Ida, Jackson, Jackson, Jackson, Jenkins, Jenkins, Koch, Levrard, Mardling, Masset, Miller, Ogihara, Ogilvie, Ogilvie, Reid, Rocha-Pinto, Rocha-Pinto, Sandquist, Schlaufman, Schlaufman, Seager, Winn   +34 more
core   +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

Strong Fractionation of Deuterium and Helium in Sub-Neptune Atmospheres along the Radius Valley

The Astrophysical Journal
We simulate atmospheric fractionation in escaping planetary atmospheres using IsoFATE , a new open-source numerical model. We expand the parameter space studied previously to planets with tenuous atmospheres that exhibit the greatest helium and deuterium
Collin Cherubim, Robin Wordsworth, Renyu Hu, Evgenya Shkolnik   +3 more
doaj   +1 more source

Ages for exoplanet host stars

, 2018
Age is an important characteristic of a planetary system, but also one that is difficult to determine. Assuming that the host star and the planets are formed at the same time, the challenge is to determine the stellar age.
A Claret, A Fogtmann-Schulz, A Skumanich, AHMJ Triaud, AJ Burgasser, AM Serenelli, Andrew W. Mann, Andrew W. Mann, Andrew W. Mann, Andrew W. Mann, B Durney, BR Jørgensen, CP Folsom, CP Folsom, D Huber, D Segransan, DR Soderblom, DR Soderblom, E Sandford, EE Mamajek, F Pont, FR Chromey, G Somers, Gaia Collaboration, Brown AGA, Vallenari A et al, H Rauer, JL Saders van, JN Connelly, K Zwintz, L Casagrande, M Asplund, M Gillon, MJ Thompson, P Sestito, PFL Maxted, PFL Maxted, R Hanbury Brown, R.D. Jeffries, RS Booth, Rudolf Kippenhahn, S Basu, S Deheuvels, S Meibom, S Meibom, S Meibom, S Meibom, SA Barnes, SA Barnes, SA Barnes, T. L. Campante, Tabetha S. Boyajian, TD Brandt, TM Brown, TR White, V Silva Aguirre, V Silva Aguirre   +54 more
core   +1 more source

A Unified Treatment of Kepler Occurrence to Trace Planet Evolution. II. The Radius Cliff Formed by Atmospheric Escape

The Astronomical Journal
The Kepler mission enabled us to look at the intrinsic population of exoplanets within our galaxy. In period-radius space, the distribution of the intrinsic population of planets contains structure that can trace planet formation and evolution history ...
Anne Dattilo, Natalie M. Batalha
doaj   +1 more source

Spatial distribution of exoplanet candidates based on Kepler and $Gaia$ data [PDF]

, 2020
The spatial distribution of exoplanets in the Galaxy is important for our understanding of planet formation and evolution. We aim to determine the spatial gradients of exoplanet occurrence in the Solar neighbourhood and in the vicinity of open clusters.
arxiv   +1 more source

A Helicity-Based Method to Infer the CME Magnetic Field Magnitude in Sun and Geospace: Generalization and Extension to Sun-Like and M-Dwarf Stars and Implications for Exoplanet Habitability

, 2017
Patsourakos et al. (Astrophys. J. 817, 14, 2016) and Patsourakos and Georgoulis (Astron. Astrophys. 595, A121, 2016) introduced a method to infer the axial magnetic field in flux-rope coronal mass ejections (CMEs) in the solar corona and farther away in ...
A. Isavnin, A. Kumar, A. Nindos, A. Nindos, A. Nindos, A. Thernisien, A. Vourlidas, A.A. Vidotto, A.A. Vidotto, A.N. Aarnio, B. Gladman, B. Kliem, B. Vrsnak, B. Vršnak, B.E. Wood, B.J. Lynch, B.J. Lynch, B.J. Lynch, B.M. Jakosky, C. Cid, C. Garraffo, C. Karoff, C. Kay, C. Kay, C. Möstl, C.-C. Wu, C.H. Mandrini, C.J. Schrijver, C.R. DeVore, D. Cunha, D. Nogami, D.J. Armstrong, E. Bosman, E. Pariat, E.A. Jensen, E.R. Houdebine, E.R. Priest, E.W. Cliver, F. Selsis, G. Anglada-Escudé, G. Aulanier, G. Chintzoglou, G. Torres, G. Valori, G.A. Gary, H. Lammer, H. Maehara, I.G. Usoskin, J. Leconte, J. Scalo, J.-F. Donati, J.-M. Grießmeier, J.-M. Grießmeier, J.F. Kasting, J.J. Drake, J.R.A. Davenport, K. Hariharan, K. Moraitis, K. Shibata, K. Tziotziou, K. Tziotziou, L.K. Harra, L.M. Green, M. Leitner, M. Leitzinger, M. Leitzinger, M. Patzold, M. Semel, M. Vandas, M.A. Berger, M.A. Hidalgo, M.D. Andrews, M.D. Kazachenko, M.K. Georgoulis, M.K. Georgoulis, M.L. Khodachenko, M.L. Luoni, M.S. Nakwacki, N. Al-Haddad, N.P. Savani, P. Démoulin, P. Démoulin, P. Démoulin, P. MacNeice, P. Riley, Q. Hu, R. Kataoka, R. Osten, R.A. Osten, R.J. Forsyth, R.M. Winslow, R.P. Lepping, S. Chapman, S. Dasso, S. Lundquist, S. Mancuso, S. Patsourakos, S. Patsourakos, S. Régnier, S. Toriumi, S. Yashiro, S.D. Tun, S.E. Gibson, S.R. Kane, S.W. Good, T. Gold, T. Nieves-Chinchilla, T. Shibayama, T.A. Howard, T.G. Forbes, T.S. Bastian, V. Bothmer, V. Kunkel, V. See, V.S. Airapetian, W. Poomvises, X. Sun, Y. Guo, Y. Liu, Y. Wang   +119 more
core   +1 more source

Precision Stellar Astrophysics in the Kepler Era

, 2016
The study of fundamental properties (such as temperatures, radii, masses, and ages) and interior processes (such as convection and angular momentum transport) of stars has implications on various topics in astrophysics, ranging from the evolution of ...
Huber, Daniel
core   +1 more source

The Diversity of Exoplanets: From Interior Dynamics to Surface Expressions [PDF]

arXiv, 2021
The coupled interior-atmosphere system of terrestrial exoplanets remains poorly understood. Exoplanets show a wide variety of sizes, densities, surface temperatures, and interior structures, with important knock-on effects for this coupled system. Many exoplanets are predicted to have a "stagnant lid" at the surface, with a rigid stationary crust ...
arxiv  

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