학술논문
TOI-908: a planet at the edge of the Neptune desert transiting a G-type star
Document Type
Working Paper
Author
Hawthorn, Faith; Bayliss, Daniel; Armstrong, David J.; Fernández, Jorge Fernández; Osborn, Ares; Sousa, Sérgio G.; Adibekyan, Vardan; Davoult, Jeanne; Collins, Karen A.; Alibert, Yann; Barros, Susana C. C.; Bouchy, François; Brogi, Matteo; Ciardi, David R.; Daylan, Tansu; Mena, Elisa Delgado; Demangeon, Olivier D. S.; Díaz, Rodrigo F.; Gan, Tianjun; Horne, Keith; Hoyer, Sergio; Levine, Alan M.; Lillo-Box, Jorge; Nielsen, Louise D.; Osborn, Hugh P.; Ricker, George R.; Rodrigues, José; Santos, Nuno C.; Schwarz, Richard P.; Seager, Sara; Bell, Juan Serrano; Shporer, Avi; Stockdale, Chris; Strøm, Paul A.; Tenenbaum, Peter; Udry, Stéphane; Wheatley, Peter J.; Winn, Joshua N.; Ziegler, Carl
Source
Subject
Language
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 $\pm$ 61 K) solar-like star with a mass of 0.950 $\pm$ 0.010 $M_{\odot}$ and a radius of 1.028 $\pm$ 0.030 $R_{\odot}$. The planet, TOI-908 b, is a 3.18 $\pm$ 0.16 $R_{\oplus}$ planet in a 3.18 day orbit. Radial velocity measurements from HARPS reveal TOI-908 b has a mass of approximately 16.1 $\pm$ 4.1 $M_{\oplus}$ , resulting in a bulk planetary density of 2.7+0.2-0.4 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.
Comment: 17 pages, 17 figures
Comment: 17 pages, 17 figures