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

Hawthorn, Faith; Bayliss, Daniel; Armstrong, David J.; Fernández Fernández, Jorge; 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; Delgado Mena, Elisa; Demangeon, Olivier D. S.; Díaz, Rodrigo F.; Gan, Tianjun; Horne, Keith; Hoyer, Sergio; Jenkins, Jon M.; Jensen, Eric L. N.; Kielkopf, John F.; Kostov, Veselin; Latham, David W.; 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; Serrano Bell, Juan; Shporer, Avi; Stockdale, Chris; Strøm, Paul A.; Tenenbaum, Peter; Udry, Stéphane; Wheatley, Peter J.; Winn, Joshua N.; Ziegler, Carl

doi:10.1093/mnras/stad1840

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

Journal Article · 22 June 2023 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stad1840 · OSTI ID:1992383

;

; Adibekyan, Vardan; Davoult, Jeanne;

; Alibert, Yann; Barros, Susana C. C.; Bouchy, François; Brogi, Matteo; Ciardi, David R.; Daylan, Tansu; Delgado Mena, Elisa;

; Díaz, Rodrigo F.; Gan, Tianjun; Horne, Keith more »

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 d 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.

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Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain

OSTI ID:: 1992383

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 524; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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