Results 21 to 30 of about 2,175 (190)

TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf [PDF]

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5 mag), high proper motion (∼200 mas yr−1), low metallicity ([Fe/H]≈−0.28) K-dwarf with a mass of 0.68 ± 0.05 M⊙ and a radius of 0.67 ± 0.01 R⊙.
Faith Hawthorn, Daniel Bayliss, Thomas G Wilson, Andrea Bonfanti, Vardan Adibekyan, Yann Alibert, Sérgio G Sousa, Karen A Collins, Edward M Bryant, Ares Osborn, David J Armstrong, Lyu Abe, Jack S Acton, Brett C Addison, Karim Agabi, Roi Alonso, Douglas R Alves, Guillem Anglada-Escudé, Tamas Bárczy, Thomas Barclay, David Barrado, Susana C C Barros, Wolfgang Baumjohann, Philippe Bendjoya, Willy Benz, Allyson Bieryla, Xavier Bonfils, François Bouchy, Alexis Brandeker, Christopher Broeg, David J A Brown, Matthew R Burleigh, Marco Buttu, Juan Cabrera, Douglas A Caldwell, Sarah L Casewell, David Charbonneau, Sébastian Charnoz, Ryan Cloutier, Andrew Collier Cameron, Kevin I Collins, Dennis M Conti, Nicolas Crouzet, Szilárd Czismadia, Melvyn B Davies, Magali Deleuil, Elisa Delgado-Mena, Laetitia Delrez, Olivier D S Demangeon, Brice-Olivier Demory, Georgina Dransfield, Xavier Dumusque, Jo Ann Egger, David Ehrenreich, Philipp Eigmüller, Anders Erickson, Zahra Essack, Andrea Fortier, Luca Fossati, Malcolm Fridlund, Maximilian N Günther, Manuel Güdel, Davide Gandolfi, Harvey Gillard, Michaël Gillon, Crystal Gnilka, Michael R Goad, Robert F Goeke, Tristan Guillot, Andreas Hadjigeorghiou, Coel Hellier, Beth A Henderson, Kevin Heng, Matthew J Hooton, Keith Horne, Steve B Howell, Sergio Hoyer, Jonathan M Irwin, James S Jenkins, Jon M Jenkins, Eric L N Jensen, Stephen R Kane, Alicia Kendall, John F Kielkopf, Laszlo L Kiss, Gaia Lacedelli, Jacques Laskar, David W Latham, Alain Lecavalier des Etangs, Adrien Leleu, Monika Lendl, Jorge Lillo-Box, Christophe Lovis, Djamel Mékarnia, Bob Massey, Tamzin Masters, Pierre F L Maxted, Valerio Nascimbeni, Louise D Nielsen, Sean M O’Brien, Göran Olofsson, Hugh P Osborn, Isabella Pagano, Enric Pallé, Carina M Persson, Giampaolo Piotto, Peter Plavchan, Don Pollacco, Didier Queloz, Roberto Ragazzoni, Heike Rauer, Ignasi Ribas, George Ricker, Damien Ségransan, Sébastien Salmon, Alexandre Santerne, Nuno C Santos, Gaetano Scandariato, François-Xavier Schmider, Richard P Schwarz, Sara Seager, Avi Shporer, Attila E Simon, Alexis M S Smith, Gregor Srdoc, Manfred Steller, Olga Suarez, Gyula M Szabó, Johanna Teske, Nicolas Thomas, Rosanna H Tilbrook, Amaury H M J Triaud, Stéphane Udry, Valérie Van Grootel, Nicholas Walton, Sharon X Wang, Peter J Wheatley, Joshua N Winn, Robert A Wittenmyer, Hui Zhang   +139 more
openaire   +22 more sources

K2-110 b: a massive mini-Neptune exoplanet [PDF]

Astronomy & Astrophysics, 2017
Submitted to A&A, May 2016; Accepted April ...
Osborn, H. P., Santerne, A., Barros, S. C. C., Santos, N. C., Dumusque, X., Malavolta, L., Armstrong, D. J., Hojjatpanah, S., Demangeon, O., Adibekyan, V., Almenara, J. ‐m., Barrado, D., Bayliss, D., Boisse, I., Bouchy, F., Brown, D. J. A., Cameron, A. C., Charbonneau, D., Deleuil, M., Delgado Mena, E., Diaz, R. F., Hebrard, G., Kirk, J., King, G. W., Lam, K. W. F., Latham, D., Lillo‐box, J., Louden, T. M., Lovis, C., Marmier, M., Mccormac, J., Molinari, E., Pepe, F., Pollacco, D., Sousa, S. G., Udry, S., Walker, S. R.   +36 more
openaire   +6 more sources

A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113 [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT We report the discovery of HD 110113 b (TESS object of interest-755.01), a transiting mini-Neptune exoplanet on a 2.5-d orbit around the solar-analogue HD 110113 (Teff = 5730 K). Using TESS photometry and High Accuracy Radial velocity Planet Searcher (HARPS) radial velocities gathered by the NCORES program, we find that HD ...
Osborn, H P, Armstrong, D J, Adibekyan, V, Collins, K A, Delgado-Mena, E, et al, Helled, R, Otegi, Jon, Dorn, C   +8 more
openaire   +8 more sources

A Shallow-water Model Exploration of Atmospheric Circulation on Sub-Neptunes: Effects of Radiative Forcing and Rotation Period

The Planetary Science Journal, 2023
Sub-Neptune-type exoplanets are abundant in our Galaxy yet have no solar system analogs. They exist in a broad range of stellar forcing and rotational regimes that are distinctly different from solar system planets and more commonly studied hot Jupiters.
Ekaterina Landgren, Alice Nadeau, Nikole Lewis, Tiffany Kataria, Peter Hitchcock   +4 more
doaj   +1 more source

Escaping Helium from TOI 560.01, a Young Mini-Neptune

The Astronomical Journal, 2022
Abstract We report helium absorption from the escaping atmosphere of TOI 560.01 (HD 73583b), an R = 2.8R ⊕, P = 6.4 day mini-Neptune orbiting a young (∼600 Myr) K dwarf. Using Keck/NIRSPEC, we detect a signal with an average depth of 0.68% ± 0.08% in the line core.
Michael Zhang, Heather A. Knutson, Lile Wang, Fei Dai, Oscar Barragán   +4 more
openaire   +3 more sources

Using Photometrically Derived Properties of Young Stars to Refine TESS’s Transiting Young Planet Survey Completeness

The Astronomical Journal, 2023
The demographics of young exoplanets can shed light on their formation and evolution processes. Exoplanet properties are derived from the properties of their host stars.
Rachel B. Fernandes, Kevin K. Hardegree-Ullman, Ilaria Pascucci, Galen J. Bergsten, Gijs D. Mulders, Katia Cunha, Eric E. Mamajek, Kyle A. Pearson, Gregory A. Feiden, Jason L. Curtis   +9 more
doaj   +1 more source

FORMATION OF CLOSE IN SUPER-EARTHS AND MINI-NEPTUNES: REQUIRED DISK MASSES AND THEIR IMPLICATIONS [PDF]

The Astrophysical Journal, 2014
Recent observations by the {\it Kepler} space telescope have led to the discovery of more than 4000 exoplanet candidates consisting of many systems with Earth- to Neptune-sized objects that reside well inside the orbit of Mercury, around their respective host stars. How and where these close-in planets formed is one of the major unanswered questions in
Hilke E. Schlichting
openalex   +5 more sources

Characterization of a Set of Small Planets with TESS and CHEOPS and an Analysis of Photometric Performance

The Astronomical Journal, 2023
The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations of many small planets.
Dominic Oddo, Diana Dragomir, Alexis Brandeker, Hugh P. Osborn, Karen Collins, Keivan G. Stassun, Nicola Astudillo-Defru, Allyson Bieryla, Steve B. Howell, David R. Ciardi, Samuel Quinn, Jose M. Almenara, César Briceño, Kevin I. Collins, Knicole D. Colón, Dennis M. Conti, Nicolas Crouzet, Elise Furlan, Tianjun Gan, Crystal L. Gnilka, Robert F. Goeke, Erica Gonzales, Mallory Harris, Jon M. Jenkins, Eric L. N. Jensen, David Latham, Nicholas Law, Michael B. Lund, Andrew W. Mann, Bob Massey, Felipe Murgas, George Ricker, Howard M. Relles, Pamela Rowden, Richard P. Schwarz, Joshua Schlieder, Avi Shporer, Sara Seager, Gregor Srdoc, Guillermo Torres, Joseph D. Twicken, Roland Vanderspek, Joshua N. Winn, Carl Ziegler   +43 more
doaj   +1 more source

TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit [PDF]

Monthly Notices of the Royal Astronomical Society
ABSTRACT We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet ...
A. Alqasim, Nolan Grieves, Nelson Augusto Rosário, D. Gandolfi, John H. Livingston, S. G. Sousa, Karen A. Collins, Johanna Teske, M. Fridlund, J. A. Egger, J. Cabrera, C. Hellier, A. F. Lanza, Vincent Van Eylen, F. Bouchy, Ryan J. Oelkers, Gregor Srdoč, Stephen A. Shectman, Maximilian N. Günther, Elisa Goffo, T. G. Wilson, L. M. Serrano, A. Brandeker, Sharon X. Wang, A. Heitzmann, A. Bonfanti, L. Fossati, Y. Alibert, L. Delrez, Ramotholo Sefako, S. C. C. Barros, Kevin I. Collins, O. D. S. Demangeon, Simon Albrecht, R. Alonso, J. Asquier, T. Bárczy, D. Barrado, W. Baumjohann, T. Beck, W. Benz, N. Billot, L. Borsato, C. Broeg, Edward M. Bryant, R. Paul Butler, William D. Cochran, A. Collier Cameron, A. C. M. Correia, Jeffrey D. Crane, Sz. Csizmadia, Patricio E. Cubillos, M. B. Davies, Tansu Daylan, M. Deleuil, A. Deline, Brice-Olivier Demory, A. Derekas, B Edwards, D. Ehrenreich, Anders Erikson, Zahra Essack, A. Fortier, K. Gazeas, M. Gillon, M. Güdel, J. Hasiba, A. P. Hatzes, Ch. Helling, Teruyuki Hirano, Steve B. Howell, S. Hoyer, K. G. Isaak, Jon M. Jenkins, Shubham Kanodia, L. L. Kiss, J. Korth, K. W. F. Lam, J. Laskar, A. Lecavelier des Étangs, M. Lendl, Michael B. Lund, R. Luque, Andrew W. Mann, Demetrio Magrin, P. F. L. Maxted, C. Mordasini, Norio Narita, V. Nascimbeni, G. Nowak, G. Olofsson, H. P. Osborn, H. L. M. Osborne, D. J. Osip, R. Ottensamer, I. Pagano, Ε. Πάλλη, G. Peter, G. Piotto, D. Pollacco   +99 more
openalex   +12 more sources

TOI-682: two mini-Neptunes, one transiting

, 2021
The TESS spacecraft detected transits of the G star HD 97260 (TOI-682), implying the presence of a planet with a radius of 3.49 Re and an orbital period of 6.84 days. We confirm the planet using radial velocities from the Planet Finder Spectrograph and measure its mass to be 12.3 Me.
Quinn, Samuel N., Horner, Jonathan, Collins, Karen A., Eastman, Jason D., Kreidberg, Laura, Rodriguez, Joseph, Vanderburg, Andrew, Wittenmyer, Robert A., Zhou, George, Butler, R. Paul, Crane, Jeffrey D., Shectman, Stephen A., Teske, Johanna K., Thompson, Ian B., Wang, Sharon X.   +14 more
openaire   +1 more source