A Pair of Dynamically Interacting Sub-Neptunes around TOI-6054

Kroft, M.A.; Beatty, T.G.; Crossfield Ian, J.M.; Livesey, J.R.; Becker, J.; Luhn, J.K.; Robertson, P.; Bieryla, A.; Ciardi, D.R.; Clark, C.A.; Goliguzova, M.V.; Howell, S.B.; Lissauer, J.J.; Littlefield, C.; Lund, M.B.; Safonov, B.S.; Murphy Joseph, M.A.; Batalha, N.M.; Bossett, M.; Brande, J.; Daylan, T.; Dressing, C.; Gagnebin, A.; Huber, D.; Isaacson, H.; Kane, S.R.; Kreidberg, L.; Latham, D.W.; Luque, R.; Polanski, A.S.; Premnath, P.H.; Rhem, M.; Rogers, C.J.; Turtelboom, E.V.

Авторы: Kroft Maxwell A., Beatty Thomas G., Crossfield Ian J.M., Livesey Joseph R., Becker Juliette, Luhn Jacob K., Robertson Paul, Bieryla Allyson, Ciardi David R., Clark Catherine A., Goliguzova Maria V., Howell Steve B., Lissauer Jack J., Littlefield Colin, Lund Michael B., Safonov Boris S., Murphy Joseph M.Akana, Batalha Natalie M., Bossett Malik, Brande Jonathan, Daylan Tansu, Dressing Courtney, Gagnebin Anna, Huber Daniel, Isaacson Howard, Kane Stephen R., Kreidberg Laura, Latham David W., Luque Rafael, Polanski Alex S., Premnath Pranav H., Rhem Maleah, Rogers Claire J., Turtelboom Emma V.
Журнал: Astronomical Journal
Том: 170
Номер: 3
Год издания: 2025
Издательство: American Astronomical Society
Местоположение издательства: United States
Первая страница: 150
Последняя страница: 167
DOI: 10.3847/1538-3881/adee24
Аннотация: We confirm the planetary nature of a pair of transiting sub-Neptune exoplanets orbiting the bright F-type subgiant star TOI-6054 (V = 8.02, K = 6.673) as a part of the OrCAS radial velocity survey using WIYN/NEID observations. We find that TOI-6054b and TOI-6054c have radii of 2.64 ± 0.15R⊕ and 2.82 ± 0.17R⊕, respectively, and masses of 12.5 ± 1.7M⊕ and 9.3 ± 1.9M⊕. The planets have zero-albedo equilibrium temperatures of 1360 ± 32 K and 1143 ± 28 K. The host star has expanded and will evolve off of the main sequence within the next ∼500 Myr, and the resulting increase in stellar luminosity has more than doubled the stellar flux the two planets receive compared to the start of the host star's main-sequence phase. Consequently, TOI-6054b may be losing some of its primordial hydrogen/helium atmosphere—if it has one. Based on dynamical simulations performed using the orbital parameters of the two planets, TOI-6054b, and TOI-6054c are very likely in a 5:3 mean motion resonance. The TOI-6054 system thus has the potential to be an excellent candidate for future atmospheric follow-up observations, with two similarly sized sub-Neptunes around a bright star. We also estimate that if TOI-6054b is currently losing its H/He atmosphere, this should be observable from space and from the ground.
Добавил в систему: Сафонов Борис Сергеевич

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