TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE

Thomas, L.; Hébrard, G.; Kellermann, H.; Korth, J.; Heidari, N.; Forveille, T.; Sousa, S.G.; Schöller, L.; Riffeser, A.; Gössl, C.; Serrano, B.J.; Kiefer, F.; Hara, N.; Grupp, F.; Ehrhardt, J.; Murgas, F.; Collins, K.A.; Bieryla, A.; Parviainen, H.; Belinski, A.A.; Esparza-Borges, E.; Ciardi, D.R.; Clark, C.A.; Fukui, A.; Gilbert, E.A.; Hopp, U.; Ikuta, K.; Jenkins, J.M.; Latham, D.W.; Narita, N.; Nielsen, L.D.; Quinn, S.N.; Palle, E.; Pippert, J.; Polanski, A.S.; Ries, C.; Schmidt, M.; Schwarz, R.P.; Seager, S.; Strakhov, I.A.; Striegel, S.; van Eyken, J.C.; Watanabe, N.; Watkins, C.N.; Winn, J.N.; Ziegler, C.; Zöller, R.

Авторы: Thomas Luis, Hébrard Guillaume, Kellermann Hanna, Korth Judith, Heidari Neda, Forveille Thierry, Sousa Sérgio G., Schöller Laura, Riffeser Arno, Gössl Claus, Serrano Bell Juan, Kiefer Flavien, Hara Nathan, Grupp Frank, Ehrhardt Juliana, Murgas Felipe, Collins Karen A., Bieryla Allyson, Parviainen Hannu, Belinski Alexandr A., Esparza-Borges Emma, Ciardi David R., Clark Catherine A., Fukui Akihiko, Gilbert Emily A., Hopp Ulrich, Ikuta Kai, Jenkins Jon M., Latham David W., Narita Norio, Nielsen Louise D., Quinn Samuel N., Palle Enric, Pippert Jan-Niklas, Polanski Alex S., Ries Christoph, Schmidt Michael, Schwarz Richard P., Seager Sara, Strakhov Ivan A., Striegel Stephanie, van Eyken Julian C., Watanabe Noriharu, Watkins Cristilyn N., Winn Joshua N., Ziegler Carl, Zöller Raphael
Журнал: Astronomy and Astrophysics
Том: 694
Номер: 1
Год издания: 2025
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: A143
Последняя страница: A167
DOI: 10.1051/0004-6361/202451676
Аннотация: We report the discovery and characterization of two sub-Saturns from the Transiting Exoplanet Survey Satellite (TESS) using high- resolution spectroscopic observations from the MaHPS spectrograph at the Wendelstein Observatory and the SOPHIE spectrograph at the Haute-Provence Observatory. Combining photometry from TESS, KeplerCam, LCOGT, and MuSCAT2, along with the radial velocity measurements from MaHPS and SOPHIE, we measured precise radii and masses for both planets. TOI-5108 b is a sub-Saturn, with a radius of 6.6 ± 0.1 R⊕ and a mass of 32 ± 5 M⊕. TOI-5786 b is similar to Saturn, with a radius of 8.54 ± 0.13 R⊕ and a mass of 73 ± 9 M⊕. The host star for TOI-5108 b is a moderately bright (Vmag 9.75) G-type star. TOI-5786 is a slightly dimmer (Vmag 10.2) F-type star. Both planets are close to their host stars, with periods of 6.75 days and 12.78 days, respectively. This puts TOI-5108 b just within the bounds of the Neptune desert, while TOI-5786 b is right above the upper edge. We estimated hydrogen-helium (H/He) envelope mass fractions of 38% for TOI-5108 b and 74% for TOI-5786 b. However, when using a model for the interior structure that includes tidal effects, the envelope fraction of TOI-5108 b could be much lower (~20%), depending on the obliquity. We estimated mass-loss rates between 1.0 x 109 g/s and 9.8 x 109 g/s for TOI-5108 b and between 3.6 x 108 g/s and 3.5 x 109 g/s for TOI-5786 b. Given their masses, both planets could be stable against photoevaporation. Furthermore, at these mass-loss rates, there is likely no detectable signal in the metastable helium triplet with the James Webb Space Telescope (JWST). We also detected a transit signal for a second planet candidate in the TESS data of TOI-5786, with a period of 6.998 days and a radius of 3.83 ± 0.16 R⊕. Using our RV data and photodynamical modeling, we were able to provide a 3-σ upper limit of 26.5 M⊕ for the mass of the potential inner companion to TOI-5786 b.
Добавил в систему: Сафонов Борис Сергеевич

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TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIEстатья

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