TOI-733 b : A planet in the small-planet radius valley orbiting a Sun-like star
(2023) In Astronomy and Astrophysics 674.- Abstract
We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered 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 {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) and place it in the transition region between rocky and... (More)
We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered 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 {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) 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 calculated 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. This is one of only a few such planets around G-type stars that are well characterised.
(Less)
- author
- organization
- publishing date
- 2023-06
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Planets and satellites: composition, Planets and satellites: detection, Planets and satellites: individual: TOI-733, Techniques: photometric, Techniques: radial velocities
- in
- Astronomy and Astrophysics
- volume
- 674
- article number
- A117
- publisher
- EDP Sciences
- external identifiers
-
- scopus:85163191861
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/202345961
- language
- English
- LU publication?
- yes
- id
- c8c432c2-d6bc-4e5e-9ab5-fd9fb842abbb
- date added to LUP
- 2023-09-15 14:15:04
- date last changed
- 2023-09-15 14:15:04
@article{c8c432c2-d6bc-4e5e-9ab5-fd9fb842abbb,
abstract = {{<p>We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered 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 {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) 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 calculated 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. This is one of only a few such planets around G-type stars that are well characterised.</p>}},
author = {{Georgieva, Iskra Y. and Persson, Carina M. and Goffo, Elisa and Acuña, Lorena and Aguichine, Artyom and Serrano, Luisa M. and Lam, Kristine W.F. and Gandolfi, Davide and Collins, Karen A. and Howell, Steven B. and Dai, Fei and Fridlund, Malcolm and Korth, Judith and Deleuil, Magali and Barragán, Oscar and Cochran, William D. and Csizmadia, Szilárd and Deeg, Hans J. and Guenther, Eike and Hatzes, Artie P. and Jenkins, Jon M. and Livingston, John and Luque, Rafael and Mousis, Olivier and Osborne, Hannah L.M. and Palle, Enric and Redfield, Seth and Van Eylen, Vincent and Twicken, Joseph D. and Winn, Joshua N. and Alqasim, Ahlam and Collins, Kevin I. and Gnilka, Crystal L. and Latham, David W. and Lewis, Hannah M. and Relles, Howard M. and Ricker, George R. and Rowden, Pamela and Seager, Sara and Shporer, Avi and Tan, Thiam Guan and Vanderburg, Andrew and Vanderspek, Roland}},
issn = {{0004-6361}},
keywords = {{Planets and satellites: composition; Planets and satellites: detection; Planets and satellites: individual: TOI-733; Techniques: photometric; Techniques: radial velocities}},
language = {{eng}},
publisher = {{EDP Sciences}},
series = {{Astronomy and Astrophysics}},
title = {{TOI-733 b : A planet in the small-planet radius valley orbiting a Sun-like star}},
url = {{http://dx.doi.org/10.1051/0004-6361/202345961}},
doi = {{10.1051/0004-6361/202345961}},
volume = {{674}},
year = {{2023}},
}