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The GAPS Programme at TNG: XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942

Carleo, I. ; Desidera, S. ; Nardiello, D. ; Malavolta, L. ; Lanza, A. F. ; Livingston, J. ; Locci, D. ; Marzari, F. ; Messina, S. ; Turrini, D. ; Baratella, M. ; Borsa, F. ; D’Orazi, V. ; Nascimbeni, V. ; Pinamonti, M. ; Rainer, M. ; Alei, E. ; Bignamini, A. ; Gratton, R. ; Micela, G. ; Montalto, M. ; Sozzetti, A. ; Squicciarini, V. ; Affer, L. ; Benatti, S. ; Biazzo, K. ; Bonomo, A. S. ; Claudi, R. ; Cosentino, R. ; Covino, E. ; Damasso, M. ; Esposito, M. ; Fiorenzano, A. ; Frustagli, G. ; Giacobbe, P. ; Harutyunyan, A. ; Leto, G. ; Magazzù, A. ; Maggio, A. ; Mainella, G. ; Maldonado, J. ; Mallonn, M. ; Mancini, L. ; Molinari, E. ; Molinaro, M. ; Pagano, I. ; Pedani, M. ; Piotto, G. ; Poretti, E. ; Redfield, S. ; Scandariato, G.

Astronomy and astrophysics (Berlin), 2021-01, Vol.645, p.A71 [Periódico revisado por pares]

EDP Sciences

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Título:
The GAPS Programme at TNG: XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942
Autor: Carleo, I. ; Desidera, S. ; Nardiello, D. ; Malavolta, L. ; Lanza, A. F. ; Livingston, J. ; Locci, D. ; Marzari, F. ; Messina, S. ; Turrini, D. ; Baratella, M. ; Borsa, F. ; D’Orazi, V. ; Nascimbeni, V. ; Pinamonti, M. ; Rainer, M. ; Alei, E. ; Bignamini, A. ; Gratton, R. ; Micela, G. ; Montalto, M. ; Sozzetti, A. ; Squicciarini, V. ; Affer, L. ; Benatti, S. ; Biazzo, K. ; Bonomo, A. S. ; Claudi, R. ; Cosentino, R. ; Covino, E. ; Damasso, M. ; Esposito, M. ; Fiorenzano, A. ; Frustagli, G. ; Giacobbe, P. ; Harutyunyan, A. ; Leto, G. ; Magazzù, A. ; Maggio, A. ; Mainella, G. ; Maldonado, J. ; Mallonn, M. ; Mancini, L. ; Molinari, E. ; Molinaro, M. ; Pagano, I. ; Pedani, M. ; Piotto, G. ; Poretti, E. ; Redfield, S. ; Scandariato, G.
Assuntos: Astrophysics ; Sciences of the Universe
É parte de: Astronomy and astrophysics (Berlin), 2021-01, Vol.645, p.A71
Descrição: 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. Aims. We validate the physical nature of two Neptune-sized planets transiting TOI-942 (TYC 5909-319-1), a previously unacknowledged young star (50 −20 +30 Myr) observed by the TESS space mission in Sector 5. 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. 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 ′ HK = −4.17 ± 0.01) with rotation period P rot = 3.39 ± 0.01 days, a projected rotation velocity v sin i ⋆ = 13.8 ± 0.5 km s −1 , and a radius of ~0.9 R ⊙ . We found that the inner planet, TOI-942 b, has an orbital period P b = 4.3263 ± 0.0011 days, a radius R b = 4.242 −0.313 +0.376 R ⊕ , and a mass upper limit of 16 M ⊕ at 1 σ confidence level. The outer planet, TOI-942 c, has an orbital period P c = 10.1605 −0.0053 +0.0056 days, a radius R c = 4.793 −0.351 +0.410 R ⊕ , and a mass upper limit of 37 M ⊕ at 1 σ confidence level.
Editor: EDP Sciences
Idioma: Inglês

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The GAPS Programme at TNG: XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942

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