학술논문
TOI-733 b: a planet in the small-planet radius valley orbiting a Sun-like star
Document Type
Working Paper
Author
Georgieva, Iskra Y.; Persson, Carina M.; Goffo, Elisa; Acuña, Lorena; Aguichine, Artyom; Serrano, Luisa M.; Lam, Kristine W. F.; Gandolfi, Davide; Collins, Karen A.; Howell, Steven B.; Dai, Fei; Fridlund, Malcolm; Korth, Judith; Deleuil, Magali; Barragán, Oscar; Cochran, William D.; Csizmadia, Szilárd; Deeg, Hans J.; Guenther, Eike; Hatzes, Artie P.; Jenkins, Jon M.; Livingston, John; Luque, Rafael; Mousis, Olivier; Osborne, Hannah L. M.; Palle, Enric; Redfield, Seth; Van Eylen, Vincent; Twicken, Joseph D.; Winn, Joshua N.; Alqasim, Ahlam; Collins, Kevin I.; Gnilka, Crystal L.; Latham, David W.; Lewis, Hannah M.; Relles, Howard M.; Ricker, George R.; Rowden, Pamela; Seager, Sara; Shporer, Avi; Tan, Thiam-Guan; Vanderburg, Andrew; Vanderspek, Roland
Source
A&A 674, A117 (2023)
Subject
Language
Abstract
We report the discovery of a hot ($T_{\rm eq}$ $\approx$ 1055 K) planet in the small planet radius valley transiting the Sun-like star TOI-733, as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of $P_{\rm orb}$ = $4.884765 _{ - 2.4e-5 } ^ { + 1.9e-5 }$ days and a radius of $R_{\mathrm{p}}$ = $1.992 _{ - 0.090 } ^ { + 0.085 }$ $R_{\oplus}$. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators, gives a semi-amplitude of $K$ = $2.23 \pm 0.26 $ m s$^{-1}$, translating into a planet mass of $M_{\mathrm{p}}$ = $5.72 _{ - 0.68 } ^ { + 0.70 }$ $M_{\oplus}$. These parameters imply that the planet is of moderate density ($\rho_\mathrm{p}$ = $3.98 _{ - 0.66 } ^ { + 0.77 }$ g cm$^{-3}$) and place it in the transition region between rocky and volatile-rich planets with H/He-dominated envelopes on the mass-radius diagram. Combining these with stellar parameters and abundances, we calculate planet interior and atmosphere models, which in turn suggest that TOI-733 b has a volatile-enriched, most likely secondary outer envelope, and may represent a highly irradiated ocean world - one of only a few such planets around G-type stars that are well-characterised.
Comment: Accepted for publication in A&A
Comment: Accepted for publication in A&A