학술논문
TOI-1199 b and TOI-1273 b: Two new transiting hot Saturns detected and characterized with SOPHIE and TESS
Document Type
Working Paper
Author
Bell, J. Serrano; Díaz, R. F.; Hébrard, G.; Martioli, E.; Heidari, N.; Sousa, S.; Boisse, I.; Almenara, J. M.; Alonso-Santiago, J.; Barros, S. C. C.; Benni, P.; Bieryla, A.; Bonfils, X.; Caldwell, D. A.; Ciardi, D. R.; Collins, K. A.; Cortés-Zuleta, P.; Dalal, S.; de León, J. P.; Deleuil, M.; Delfosse, X.; Demangeon, O. D. S.; Esparza-Borges, E.; Forveille, T.; Frasca, A.; Fukui, A.; Gregorio, J.; Guerrero, N. M.; Howell, S. B.; Hoyer, S.; Ikuta, K.; Jenkins, J. M.; Kiefer, F.; Latham, D. W.; Marino, G.; Michaels, E. J.; Moutou, C.; Murgas, F.; Narita, N.; Palle, E.; Parviainen, H.; Santos, N. C.; Stassun, K. G.; Winn, J. N.
Source
A&A, 684, A6 (2024)
Subject
Language
Abstract
We report the characterization of two planet candidates detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-1199 b and TOI-1273 b, with periods of 3.7 and 4.6 days, respectively. Follow-up observations for both targets, which include several ground-based light curves, confirmed the transit events. High-precision radial velocities from the SOPHIE spectrograph revealed signals at the expected frequencies and phases of the transiting candidates and allowed mass determinations with a precision of $8.4\%$ and $6.7\%$ for TOI-1199 b and TOI-1273 b, respectively. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We find that the planets have masses of $0.239\,\pm\,0.020\,M_{\mathrm{J}}$ and $0.222\,\pm\,0.015\,M_{\mathrm{J}}$ and radii of $0.938\,\pm\,0.025\,R_{\mathrm{J}}$ and $0.99\,\pm\,0.22\,R_{\mathrm{J}}$, respectively. The grazing transit of TOI-1273 b translates to a larger uncertainty in its radius, and hence also in its bulk density, compared to TOI-1199 b. The inferred bulk densities of $0.358\,\pm\,0.041\,\mathrm{g}\,\mathrm{cm}^{-3}$ and $0.28\,\pm\,0.11\,\mathrm{g}\,\mathrm{cm}^{-3}$ are among the lowest known for exoplanets in this mass range, which, considering the brightness of the host stars ($V \approx 11\,\mathrm{mag}$), render them particularly amenable to atmospheric characterization via the transit spectroscopy technique. The better constraints on the parameters of TOI-1199 b provide a transmission spectroscopy metric of $134\,\pm\,17$, making it the better suited of the two planets for atmospheric studies.
Comment: Accepted for publication in A&A. 20 pages, 7 tables, and 15 figures
Comment: Accepted for publication in A&A. 20 pages, 7 tables, and 15 figures