Data di Pubblicazione:
2023
Abstract:
We present the discovery of an exoplanet transiting TOI-908 (TIC-350153977) using data from TESS sectors 1, 12, 13, 27, 28, and 39. TOI-908 is a T = 10.7 mag G-dwarf (T-eff = 5626 +/- 61 K) solar-like star with a mass of 0.950 +/- 0.010 M (circle dot) and a radius of 1.028 +/- 0.030 R-circle dot. The planet, TOI-908 b, is a 3.18 +/- 0.16 R-circle plus planet in a 3.18 d orbit. Radial velocity measurements from HARPS reveal TOI-908 b has a mass of approximately 16.1 +/- 4.1 M-circle plus, resulting in a bulk planetary density of 2.7(-0.4)(+0.2) g cm(-3). TOI-908 b lies in a sparsely populated region of parameter space known as the Neptune desert. The planet likely began its life as a sub-Saturn planet before it experienced significant photoevaporation due to X-rays and extreme ultraviolet radiation from its host star, and is likely to continue evaporating, losing a significant fraction of its residual envelope mass.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
techniques: photometric; techniques: radial velocities; planets and satellites: detection; stars: individual: TOI-908 (TIC-350153977, GAIA DR3 46192380870592067842)
Elenco autori:
Hawthorn F.; Bayliss D.; Armstrong D.J.; Fernandez Fernandez J.; Osborn A.; Sousa S.G.; Adibekyan V.; Davoult J.; Collins K.A.; Alibert Y.; Barros S.C.C.; Bouchy F.; Brogi M.; Ciardi D.R.; Daylan T.; Delgado Mena E.; Demangeon O.D.S.; Diaz R.F.; Gan T.; Horne K.; Hoyer S.; Jenkins J.M.; Jensen E.L.N.; Kielkopf J.F.; Kostov V.; Latham D.W.; Levine A.M.; Lillo-Box J.; Nielsen L.D.; Osborn H.P.; Ricker G.R.; Rodrigues J.; Santos N.C.; Schwarz R.P.; Seager S.; Serrano Bell J.; Shporer A.; Stockdale C.; Strom P.A.; Tenenbaum P.; Udry S.; Wheatley P.J.; Winn J.N.; Ziegler C.
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