TOI-908: a planet at the edge of the Neptune desert transiting a G-type star

Faith Hawthorn*, Daniel Bayliss*, David J. Armstrong*, Jorge Fernández Fernández, Ares Osborn, Sérgio G. Sousa, Vardan Adibekyan, Jeanne Davoult, Karen A. Collins, Yann Alibert, Susana C. C. Barros, François Bouchy, Matteo Brogi, David R. Ciardi, Tansu Daylan, Elisa Delgado Mena, Olivier D. S. Demangeon, Rodrigo F. Díaz, Tianjun Gan, Keith HorneSergio Hoyer, Alan M. Levine, Jorge Lillo-Box, Louise D. Nielsen, Hugh P. Osborn, George R. Ricker, José Rodrigues, Nuno C. Santos, Richard P. Schwarz, Sara Seager, Juan Serrano Bell, Avi Shporer, Chris Stockdale, Paul A. Strøm, Peter Tenenbaum, Stéphane Udry, Peter J. Wheatley, Joshua N. Winn, Carl Ziegler

*Corresponding author for this work

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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 (Teff = 5626 ± 61 K) solar-like star with a mass of 0.950 ± 0.010 M and a radius of 1.028 ± 0.030 R. The planet, TOI-908 b, is a 3.18 ± 0.16 R planet in a 3.18 day orbit. Radial velocity measurements from HARPS reveal TOI-908 b has a mass of approximately 16.1 ± 4.1 M, 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.
Original languageEnglish
Pages (from-to)3877–3893
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume524
Issue number3
Early online date25 Jul 2023
DOIs
Publication statusPublished - 1 Sept 2023

Keywords

  • Planets and satellites: detection
  • Stars: individual: TOI-908 (TIC-350153977, GAIA DR3 46192380870592067842)
  • Techniques: photometric
  • Techniques: radial velocities

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