Issue |
A&A
Volume 695, March 2025
|
|
---|---|---|
Article Number | A237 | |
Number of page(s) | 12 | |
Section | Planets, planetary systems, and small bodies | |
DOI | https://doi.org/10.1051/0004-6361/202452887 | |
Published online | 25 March 2025 |
TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO★
1
Instituto de Astrofísica e Ciencias do Espaço, Universidade do Porto, CAUP, Rua das Estrelas,
4150-762
Porto,
Portugal
2
Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre,
4169-007
Porto,
Portugal
3
Observatoire François-Xavier Bagnoud – OFXB,
3961
Saint-Luc,
Switzerland
4
Center for Space and Habitability, University of Bern,
Gesellschaftsstrasse 6,
3012
Bern,
Switzerland
5
Physics Institute of University of Bern,
Gesellschaftsstrasse 6,
3012
Bern,
Switzerland
6
Observatoire Astronomique de l’Université de Genève,
Chemin Pegasi 51b,
1290
Versoix,
Switzerland
7
INAF – Osservatorio Astrofisico di Torino,
Via Osservatorio 20,
10025
Pino Torinese,
Italy
8
INAF – Osservatorio Astrofisico di Trieste,
via G. B. Tiepolo 11,
34143,
Trieste,
Italy
9
IFPU–Institute for Fundamental Physics of the Universe,
via Beirut 2,
34151
Trieste,
Italy
10
Department of Physics, Engineering and Astronomy, Stephen F. Austin State University,
1936 North St,
Nacogdoches,
TX
75962,
USA
11
Instituto de Astrofísica de Canarias,
38205
La Laguna, Tenerife,
Spain
12
Universidad de La Laguna, Dept. Astrofísica,
38206
La Laguna, Tenerife,
Spain
13
European Southern Observatory,
Karl-Schwarzschild-Strasse 2,
85748,
Garching b. Munchen,
Germany
14
European Southern Observatory,
Alonso de Cordova 3107, Vitacura,
Region Metropolitana,
Chile
15
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas,
4150-762
Porto,
Portugal
16
Department of Physics and Astronomy, Vanderbilt University,
Nashville,
TN
37235,
USA
17
INAF – Osservatorio Astronomico di Palermo,
Piazza del Parlamento 1,
90134
Palermo,
Italy
18
Fundación Galileo Galilei-INAF,
Rambla José Ana Fernandez Pérez 7,
38712
Breña Baja,
TF,
Spain
19
Instituto de Astrofísica e Ciencias do Espaco, Faculdade de Ciencias da Universidade de Lisboa,
Edifício C8, Campo Grande,
1749-016
Lisbon,
Portugal
20
Centro de Astrobiología, CSIC-INTA, Camino Bajo del Castillo s/n,
28602
Villanueva de la Cañada, Madrid,
Spain
★★ Corresponding author; jose.rodrigues@astro.up.pt
Received:
5
November
2024
Accepted:
10
February
2025
Context. One of the goals of the ESPRESSO guaranteed time observations (GTOs) at the ESO 8.2 m telescope is to follow up on candidate planets from transit surveys such as the TESS mission. High-precision radial velocities are required to characterize small exoplanets.
Aims. We intend to confirm the existence of a transiting super-Earth around the bright (V=9.74) K0-type star TOI-512 (TIC 119292328) and provide a characterization.
Methods. Combining photometric data from TESS and 37 high-resolution spectroscopic observations from ESPRESSO in a joint Markov chain Monte Carlo analysis, we determined the planetary parameters of TOI-512b and characterized its internal structure.
Results. We find that TOI-512b is a super-Earth, with a radius of 1.54 ± 0.10 R⊕ and mass of 3.57−0.55+0.53 M⊕, on a 7.19−6.1·10−5+7.10−5 day orbit. This corresponds to a bulk density of 5.62−1.28+1.59 g cm−3. Our interior structure analysis presents a small inner core representing 0.13−0.11+0.13 of the solid mass fraction for the planet, surrounded by a mantle with a mass fraction of 0.69−0.22+0.20, and an upper limit of the water layer of 0.16. The gas mass below 10−8.93 indicates a very small amount of gas on the planet. We find no evidence of the second candidate found by the TESS pipeline, TOI-512.02, neither in TESS photometry, nor in the ESPRESSO radial velocities. The low stellar activity makes it an interesting transmission spectroscopy candidate for future-generation instruments.
Key words: techniques: photometric / techniques: radial velocities / planets and satellites: composition / planets and satellites: detection / planetary systems / stars: individual: TOI-512
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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