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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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