TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO
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.
Authors
- N. J. Nunes (ORCID: https://orcid.org/0000-0002-3837-6914)
- J. Rodrigues (ORCID: https://orcid.org/0000-0001-5164-3602)
- Y. Alibert (ORCID: https://orcid.org/0000-0002-4644-8818)
- E. Palle
- K.G. Stassun
- D. Bossini (ORCID: https://orcid.org/0000-0002-9480-8400)
- C. Lovis
- C. Ziegler
- A. Mehner (ORCID: https://orcid.org/0000-0002-9564-3302)
- Jeanne Davoult (ORCID: https://orcid.org/0000-0002-6177-2085)
- M. R. Zapatero Osorio (ORCID: https://orcid.org/0000-0001-5664-2852)
- S. Cristiani (ORCID: https://orcid.org/0000-0002-2115-5234)
- M. Damasso
- C. J. A. P. Martins (ORCID: https://orcid.org/0000-0002-4886-9261)
- B. Lavie (ORCID: https://orcid.org/0000-0001-8884-9276)
- R. Rebolo
- N.C. Santos
- J. P. Faria (ORCID: https://orcid.org/0000-0002-6728-244X)
- P. Molaro (ORCID: https://orcid.org/0000-0002-0571-4163)
- V. Adibekyan (ORCID: https://orcid.org/0000-0002-0601-6199)
- A. Suárez Mascareño (ORCID: https://orcid.org/0000-0002-3814-5323)
- Alessandro Sozzetti (ORCID: https://orcid.org/0000-0002-7504-365X)
- F. Bouchy
- A. Castro-González (ORCID: https://orcid.org/0000-0001-7439-3618)
- F. Pepe
- D. Ehrenreich
- R. Génova-Santos (ORCID: https://orcid.org/0000-0001-5479-0034)
- S. Udry
- S. C. C. Barros (ORCID: https://orcid.org/0000-0003-2434-3625)
- P. Figueira
- E. Poretti
- J. I. Gónzalez Hernández (ORCID: https://orcid.org/0000-0002-0264-7356)
- O. D. S. Demangeon
- Mélissa J. Hobson (ORCID: https://orcid.org/0000-0002-5945-7975)
- G. Lo Curto (ORCID: https://orcid.org/0000-0002-1158-9354)
- Mohamed Attia
- V. D'Odorico
- S. G. Sousa (ORCID: https://orcid.org/0000-0001-9047-2965)
- Ana Maria Silva (ORCID: https://orcid.org/0000-0003-2002-4774)
- G. Micela
- C. Allende Prieto
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2025-02-20
- DOI
- https://doi.org/10.1051/0004-6361/202452887
- Citations
- 1
- Primary Topic
- Astronomical Observations and Instrumentation
- Type
- article
- Field-Weighted Citation Impact
- 1.33
Funders
- National Science Foundation
- National Aeronautics and Space Administration
- California Institute of Technology
- Ministerio de Ciencia, Innovación y Universidades
- European Space Agency
- European Commission
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Ministerio de Ciencia e Innovación
- Fundação para a Ciência e a Tecnologia
- European Regional Development Fund
- Agencia Estatal de Investigación