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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/20.500.12386/31638
Title: The GAPS Programme at TNG. XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942
Authors: Carleo, I.
DESIDERA, Silvano 
Nardiello, D.
Malavolta, L. 
LANZA, Antonino Francesco 
Livingston, J.
Locci, Daniele 
Marzari, F.
MESSINA, Sergio 
TURRINI, Diego 
Baratella, M.
BORSA, Francesco 
D'ORAZI, VALENTINA 
NASCIMBENI, VALERIO 
Pinamonti, Matteo 
RAINER, Monica 
Alei, E.
BIGNAMINI, ANDREA 
GRATTON, Raffaele 
MICELA, Giuseppina 
Montalto, M.
SOZZETTI, Alessandro 
Squicciarini, V.
AFFER, Laura 
BENATTI, SERENA 
BIAZZO, Katia 
BONOMO, ALDO STEFANO 
CLAUDI, Riccardo 
COSENTINO, Rosario 
COVINO, Elvira 
Damasso, Mario 
Esposito, M.
Fiorenzano, A.
FRUSTAGLI, GIUSEPPE 
GIACOBBE, Paolo 
Harutyunyan, A.
LETO, Giuseppe 
MAGAZZU', Antonio 
MAGGIO, Antonio 
Mainella, G.
MALDONADO PRADO, Jesus 
Mallonn, M.
Mancini, L.
MOLINARI, Emilio Carlo 
MOLINARO, Marco 
PAGANO, Isabella 
Pedani, M.
Piotto, G.
PORETTI, Ennio 
Redfield, S.
SCANDARIATO, GAETANO 
Issue Date: 2021
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 645
First Page: A71
Abstract: Context. Young stars and multi-planet systems are two types of primary objects that allow us to study, understand, and constrain planetary formation and evolution theories. <BR /> Aims: We validate the physical nature of two Neptune-sized planets transiting TOI-942 (TYC 5909-319-1), a previously unacknowledged young star (50<SUB>-20</SUB><SUP>+30</SUP> Myr) observed by the TESS space mission in Sector 5. <BR /> Methods: Thanks to a comprehensive stellar characterization, TESS light curve modeling and precise radial-velocity measurements, we validated the planetary nature of the TESS candidate and detected an additional transiting planet in the system on a larger orbit. <BR /> Results: From photometric and spectroscopic observations we performed an exhaustive stellar characterization and derived the main stellar parameters. TOI-942 is a relatively active K2.5V star (log R'<SUB>HK</SUB> = -4.17 ± 0.01) with rotation period P<SUB>rot</SUB> = 3.39 ± 0.01 days, a projected rotation velocity v sin i<SUB>⋆</SUB> = 13.8 ± 0.5 km s<SUP>-1</SUP>, and a radius of ~0.9 R<SUB>⊙</SUB>. We found that the inner planet, TOI-942 b, has an orbital period P<SUB>b</SUB> = 4.3263 ± 0.0011 days, a radius R<SUB>b</SUB> = 4.242<SUB>-0.313</SUB><SUP>+0.376</SUP> R<SUB>⊕</SUB>, and a mass upper limit of 16 M<SUB>⊕</SUB> at 1σ confidence level. The outer planet, TOI-942 c, has an orbital period P<SUB>c</SUB> = 10.1605<SUB>-0.0053</SUB><SUP>+0.0056</SUP> days, a radius R<SUB>c</SUB> = 4.793<SUB>-0.351</SUB><SUP>+0.410</SUP> R<SUB>⊕</SUB>, and a mass upper limit of 37 M<SUB>⊕</SUB> at 1σ confidence level. <P />Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated by the Fundación Galileo Galilei (FGG) of the Istituto Nazionale di Astrofisica (INAF) at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands, Spain). <P />The authors became aware of a parallel effort on the characterization of TOI-942 by Zhou et al. (2021) in the late stages of the manuscript preparations. The submissions are coordinated, and no analyses or results were shared prior to submission.
URI: http://hdl.handle.net/20.500.12386/31638
URL: http://arxiv.org/abs/2011.13795v1
https://www.aanda.org/articles/aa/full_html/2021/01/aa39042-20/aa39042-20.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202039042
Bibcode ADS: 2021A&A...645A..71C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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