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http://hdl.handle.net/20.500.12386/31665
Title: | A Pair of TESS Planets Spanning the Radius Valley around the Nearby Mid-M Dwarf LTT 3780 | Authors: | Cloutier, Ryan Eastman, Jason D. Rodriguez, Joseph E. Astudillo-Defru, Nicola Bonfils, Xavier Mortier, Annelies Watson, Christopher A. Stalport, Manu Pinamonti, Matteo Lienhard, Florian HARUTYUNYAN, AVET Damasso, Mario Latham, David W. Collins, Karen A. Massey, Robert Irwin, Jonathan Winters, Jennifer G. Charbonneau, David Ziegler, Carl Matthews, Elisabeth Crossfield, Ian J. M. Kreidberg, Laura Quinn, Samuel N. Ricker, George Vanderspek, Roland Seager, Sara Winn, Joshua Jenkins, Jon M. Vezie, Michael Udry, Stéphane Twicken, Joseph D. Tenenbaum, Peter SOZZETTI, Alessandro Ségransan, Damien Schlieder, Joshua E. Sasselov, Dimitar Santos, Nuno C. Rice, Ken Rackham, Benjamin V. PORETTI, Ennio PIOTTO , GIAMPAOLO Phillips, David Pepe, Francesco MOLINARI, Emilio Carlo Mignon, Lucile MICELA, Giuseppina Melo, Claudio de Medeiros, José R. Mayor, Michel Matson, Rachel A. Martinez Fiorenzano, Aldo F. Mann, Andrew W. MAGAZZU', Antonio Lovis, Christophe López-Morales, Mercedes Lopez, Eric Lissauer, Jack J. Lépine, Sébastien Law, Nicholas Kielkopf, John F. Johnson, John A. Jensen, Eric L. N. Howell, Steve B. Gonzales, Erica Ghedina, Adriano Forveille, Thierry Figueira, Pedro Dumusque, Xavier Dressing, Courtney D. Doyon, René Díaz, Rodrigo F. Fabrizio, Luca Di Delfosse, Xavier COSENTINO, Rosario Conti, Dennis M. Collins, Kevin I. Cameron, Andrew Collier Ciardi, David Caldwell, Douglas A. Burke, Christopher Buchhave, Lars Briceño, César Boyd, Patricia Bouchy, François Beichman, Charles Artigau, Étienne Almenara, Jose M. |
Issue Date: | 2020 | Journal: | THE ASTRONOMICAL JOURNAL | Number: | 160 | Issue: | 1 | First Page: | 3 | Abstract: | We present the confirmation of two new planets transiting the nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, V = 13.07, K<SUB>s</SUB> = 8.204, R<SUB>s</SUB> = 0.374 R<SUB>⊙</SUB>, M<SUB>s</SUB> = 0.401 M<SUB>⊙</SUB>, d = 22 pc). The two planet candidates are identified in a single Transiting Exoplanet Survey Satellite sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, and high-resolution imaging. With measured orbital periods of P<SUB>b</SUB> = 0.77, P<SUB>c</SUB> = 12.25 days and sizes r<SUB>p,b</SUB> = 1.33 ± 0.07, r<SUB>p,c</SUB> = 2.30 ± 0.16 R<SUB>⊕</SUB>, the two planets span the radius valley in period-radius space around low-mass stars, thus making the system a laboratory to test competing theories of the emergence of the radius valley in that stellar mass regime. By combining 63 precise radial velocity measurements from the High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N, we measure planet masses of ${m}_{p,b}={2.62}_{-0.46}^{+0.48}$ and ${m}_{p,c}={8.6}_{-1.3}^{+1.6}$ M<SUB>⊕</SUB>, which indicates that LTT 3780b has a bulk composition consistent with being Earth-like, while LTT 3780c likely hosts an extended H/He envelope. We show that the recovered planetary masses are consistent with predictions from both photoevaporation and core-powered mass-loss models. The brightness and small size of LTT 3780, along with the measured planetary parameters, render LTT 3780b and c as accessible targets for atmospheric characterization of planets within the same planetary system and spanning the radius valley. | URI: | http://hdl.handle.net/20.500.12386/31665 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/ab91c2 https://api.elsevier.com/content/abstract/scopus_id/85087781347 |
ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/ab91c2 | Bibcode ADS: | 2020AJ....160....3C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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2003.01136.pdf | preprint | 5.03 MB | Adobe PDF | View/Open |
Cloutier+2020.pdf | [Administrators only] | 1.52 MB | Adobe PDF |
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