Results 11 to 20 of about 2,175 (190)

Photochemistry in Terrestrial Exoplanet Atmospheres III: Photochemistry and Thermochemistry in Thick Atmospheres on Super Earths and Mini Neptunes [PDF]

, 2013
Some super Earths and mini Neptunes will likely have thick atmospheres that are not H2-dominated. We have developed a photochemistry-thermochemistry kinetic-transport model for exploring the compositions of thick atmospheres on super Earths and mini ...
Hu, Renyu, Seager, Sara
core   +4 more sources

Formation of Super-Earths and Mini-Neptunes from Rings of Planetesimals

The Astrophysical Journal Letters
The solar system's planetary architecture has been proposed to be consistent with the terrestrial and giant planets forming from material rings at ∼1 au and ∼5 au, respectively.
Sho Shibata, Andre Izidoro
doaj   +3 more sources

Characterising Atmospheres of Cloudy Temperate Mini-Neptunes with JWST [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT The upcoming James Webb Space Telescope (JWST) promises a generational shift in the study of temperate mini-Neptune atmospheres using transit spectroscopy. High-altitude clouds, however, threaten to impede their atmospheric characterization by muting spectral features. In this study, we systematically investigate JWST instrument
Savvas Constantinou, Nikku Madhusudhan
openalex   +3 more sources

Ohmic Dissipation in Mini-Neptunes [PDF]

The Astrophysical Journal, 2017
Abstract In the presence of a magnetic field and weakly ionizing winds, ohmic dissipation is expected to take place in the envelopes of Jovian and lower-mass planets alike. While the process has been investigated on the former, there have been no studies done on mini-Neptunes so far.
Bonan Pu, Diana Valencia
openalex   +4 more sources

The formation of super-Earths and mini-Neptunes with giant impacts [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
The majority of discovered exoplanetary systems harbour a new class of planets, bodies typically several times more massive than Earth but orbiting their host stars well inside the orbit of Mercury. The origin of these close-in super-Earths and mini-Neptunes is a major unanswered question in planet formation.
Niraj K. Inamdar, Hilke E. Schlichting
openalex   +5 more sources

The Role of Magnetospheric Rebound in Breaking Resonant Chains of Super-Earths and Mini-Neptunes

The Astrophysical Journal
Stellar magnetic fields are thought to truncate the inner regions of protoplanetary disks around T Tauri stars, creating a magnetospheric cavity near the star.
Mengrui Pan, Andre Izidoro, Sho Shibata
doaj   +2 more sources

Using Densities to Compare Neptunes, Mini-Neptunes and Super-Earths [PDF]

Michael C. LoPresto
openalex   +2 more sources

Mass determinations of the three mini-Neptunes transiting TOI-125 [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission’s primary science goal of establishing bulk densities for 50 planets smaller than Neptune.
Louise D. Nielsen, D. Gandolfi, D. J. Armstrong, J. S. Jenkins, M. Fridlund, N. C. Santos, F. Dai, V. Adibekyan, R. Luque, Jason H. Steffen, M. Esposito, Farzana Meru, S. Sabotta, Émeline Bolmont, D. Kossakowski, Jon Otegi, F. Murgas, M. Stalport, F. Rodler, Matías R. Díaz, N. T. Kurtovic, G. Ricker, R. Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Romain Allart, J. M. Almenara, D. Barrado, S. C. C. Barros, Daniel Bayliss, Z. M. Berdiñas, I. Boisse, F. Bouchy, Patricia T. Boyd, D. J. A. Brown, Edward M. Bryant, Christopher J. Burke, William D. Cochran, Benjamin F Cooke, O. D. S. Demangeon, R. F. Díaz, Jason A. Dittman, Caroline Dorn, X. Dumusque, R. A. García, L. González-Cuesta, S. Grziwa, Iskra Georgieva, Natalia Guerrero, A. P. Hatzes, Ravit Helled, Christopher E. Henze, S. Hojjatpanah, J. Korth, K. W. F. Lam, J. Lillo-Box, T. Lopez, John H. Livingston, S. Mathur, O. Mousis, Norio Narita, H. P. Osborn, Ε. Πάλλη, Pablo A. Peña Rojas, C. M. Persson, Samuel N. Quinn, H. Rauer, Seth Redfield, A. Santerne, Leonardo A. Dos Santos, J. V. Seidel, S. G. Sousa, Eric B. Ting, Martin Turbet, S. Udry, Andrew Vanderburg, Vincent Van Eylen, José I Vines, P. J. Wheatley, P. A. Wilson   +81 more
openalex   +15 more sources

The Multiplanet System TOI-421: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary* [PDF]

The Astronomical Journal, 2020
Abstract We report the discovery of a warm Neptune and a hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), a bright (V = 9.9) G9 dwarf star in a visual binary system observed by the Transiting Exoplanet Survey Satellite (TESS) space mission in Sectors 5 and 6. We performed ground-based follow-up observations—comprised of Las
I. Carleo, D. Gandolfi, Oscar Barragán, John H. Livingston, C. M. Persson, K. W. F. Lam, A. A. Vidotto, Michael B. Lund, Carolina Villarreal D’Angelo, Karen A. Collins, L. Fossati, Andrew W. Howard, Daria Kubyshkina, Rafael Brahm, Antonija Oklopčić, P. Mollière, Seth Redfield, L. M. Serrano, Fei Dai, Malcolm Fridlund, F. Borsa, J. Korth, M. Esposito, Matías R. Díaz, Louise D. Nielsen, C. Hellier, S. Mathur, H. J. Deeg, A. P. Hatzes, S. Benatti, F. Rodler, Javier Alarcón, L. Spina, Â. R. G. Santos, Iskra Georgieva, R. A. García, L. González-Cuesta, G. Ricker, R. Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Simon Albrecht, Natalie M. Batalha, Corey Beard, Patricia T. Boyd, F. Bouchy, Jennifer Burt, R. Paul Butler, J. Cabrera, Ashley Chontos, David R. Ciardi, William D. Cochran, Kevin I. Collins, Jeffrey D. Crane, Ian J. M. Crossfield, Szilárd Csizmadia, Diana Dragomir, Courtney D. Dressing, Philipp Eigmüller, Michael Endl, A. Erikson, Néstor Espinoza, Michael Fausnaugh, Fabo Feng, Erin Flowers, Benjamin J. Fulton, Erica J. Gonzales, Nolan Grieves, S. Grziwa, E. W. Guenther, Natalia Guerrero, Thomas Henning, D. Hidalgo, Teruyuki Hirano, María Hjorth, Daniel Huber, Howard Isaacson, Matías Jones, Andrés Jordán, P. Kábath, Stephen R. Kane, Emil Knudstrup, Jack Lubin, R. Luque, Ismael Mireles, Norio Narita, D. Nespral, Prajwal Niraula, G. Nowak, Ε. Πάλλη, M. Pätzold, Erik A. Petigura, J. Prieto-Arranz, H. Rauer, Paul Robertson, Mark E. Rose, Arpita Roy, P. Sarkis   +99 more
openalex   +8 more sources

A super-Earth and a mini-Neptune around Kepler-59 [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
ABSTRACT We characterize the radii and masses of the star and planets in the Kepler-59 system, as well as their orbital parameters. The star parameters are determined through a standard spectroscopic analysis, resulting in a mass of $1.359\pm 0.155\, \mathrm{M}_\odot$ and a radius of $1.367\pm 0.078\, \mathrm{R}_\odot$.
Ximena Saad-Olivera, Cintia F. Martínez, A Costa de Souza, F. Roig, David Nesvorný   +4 more
openalex   +3 more sources