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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/20.500.12386/32031
Title: TOI-1634 b: An Ultra-short-period Keystone Planet Sitting inside the M-dwarf Radius Valley
Authors: Cloutier, Ryan
Charbonneau, David
Stassun, Keivan G.
Murgas, Felipe
Mortier, Annelies
Massey, Robert
Lissauer, Jack J.
Latham, David W.
Irwin, Jonathan
Haywood, Raphaëlle D.
Guerra, Pere
Girardin, Eric
Giacalone, Steven A.
Bosch-Cabot, Pau
Bieryla, Allyson
Winn, Joshua
Watson, Christopher A.
Vanderspek, Roland
Udry, Stéphane
Tamura, Motohide
SOZZETTI, Alessandro 
Shporer, Avi
Ségransan, Damien
Seager, Sara
Savel, Arjun B.
Sasselov, Dimitar
Rose, Mark
Ricker, George
Rice, Ken
Quintana, Elisa V.
Quinn, Samuel N.
PIOTTO , GIAMPAOLO 
Phillips, David
Pepe, Francesco
Pedani, Marco
Parviainen, Hannu
Palle, Enric
Narita, Norio
MOLINARI, Emilio Carlo 
MICELA, Giuseppina 
McDermott, Scott
Mayor, Michel
Matson, Rachel A.
Martinez Fiorenzano, Aldo F.
Lovis, Christophe
López-Morales, Mercedes
Kusakabe, Nobuhiko
Jensen, Eric L. N.
Jenkins, Jon M.
Huang, Chelsea X.
Howell, Steve B.
HARUTYUNYAN, AVET 
Fűrész, Gábor
Fukui, Akihiko
Esquerdo, Gilbert A.
Esparza-Borges, Emma
Dumusque, Xavier
Dressing, Courtney D.
Fabrizio, Luca Di
Collins, Karen A.
Cameron, Andrew Collier
Christiansen, Jessie L.
Cecconi, Massimo 
Buchhave, Lars A.
Boschin, Walter 
ANDREUZZI, Gloria 
Issue Date: 2021
Journal: THE ASTRONOMICAL JOURNAL 
Number: 162
Issue: 2
First Page: 79
Abstract: Studies of close-in planets orbiting M dwarfs have suggested that the M-dwarf radius valley may be well explained by distinct formation timescales between enveloped terrestrials and rocky planets that form at late times in a gas-depleted environment. This scenario is at odds with the picture that close-in rocky planets form with a primordial gaseous envelope that is subsequently stripped away by some thermally driven mass-loss process. These two physical scenarios make unique predictions of the rocky/enveloped transition's dependence on orbital separation such that studying the compositions of planets within the M-dwarf radius valley may be able to establish the dominant physics. Here, we present the discovery of one such keystone planet: the ultra-short-period planet TOI-1634 b (P = 0.989 days, $F=121{F}_{\oplus }$, ${r}_{p}={1.790}_{-0.081}^{+0.080}$ R<SUB>⊕</SUB>) orbiting a nearby M2 dwarf (K<SUB>s</SUB> = 8.7, R<SUB>s</SUB> = 0.450 R<SUB>⊙</SUB>, M<SUB>s</SUB> = 0.502 M<SUB>⊙</SUB>) and whose size and orbital period sit within the M-dwarf radius valley. We confirm the TESS-discovered planet candidate using extensive ground-based follow-up campaigns, including a set of 32 precise radial velocity measurements from HARPS-N. We measure a planetary mass of ${4.91}_{-0.70}^{+0.68}$ M<SUB>⊕</SUB>, which makes TOI-1634 b inconsistent with an Earth-like composition at $5.9\sigma $ and thus requires either an extended gaseous envelope, a large volatile-rich layer, or a rocky composition that is not dominated by iron and silicates to explain its mass and radius. The discovery that the bulk composition of TOI-1634 b is inconsistent with that of Earth supports the gas-depleted formation mechanism to explain the emergence of the radius valley around M dwarfs with ${M}_{s}\lesssim 0.5$ M<SUB>⊙</SUB>.
URI: http://hdl.handle.net/20.500.12386/32031
URL: https://api.elsevier.com/content/abstract/scopus_id/85113303932
https://iopscience.iop.org/article/10.3847/1538-3881/ac0157
ISSN: 0004-6256
DOI: 10.3847/1538-3881/ac0157
Bibcode ADS: 2021AJ....162...79C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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