planets and satellites: composition; planets and satellites: individual: TOI-771; Planetary Astrophysics
Abstract :
[en] Context. The origin and evolution of the sub-Neptune population is a highly debated topic in the exoplanet community. With the advent of JWST, atmospheric studies can now put unprecedented constraints on the internal composition of this population. In this context, the THIRSTEE project aims to investigate the population properties of sub-Neptunes with a comprehensive and demographic approach, providing a homogeneous sample of precisely characterised sub-Neptunes across stellar spectral types. Aims. We present here the precise characterisation of the planetary system orbiting one of the THIRSTEE M-dwarf targets, TOI-771 (d = 25 pc, V = 14.9 mag), known to host one planet, TOI-771 b, which has been statistically validated using TESS observations. Methods. We use TESS, SPECULOOS, TRAPPIST, and M-Earth photometry together with 31 high-precision ESPRESSO radial velocities to derive the orbital parameters and investigate the internal composition of TOI-771 b, as well as exploring the presence of additional companions in the system. Results. We derived the precise mass and radius for TOI-771 b, a super-Earth with Rb = 1.36 ± 0.10 R⊕ and Mb = 2.47 (error ‑0.31;+0.32)M⊕ orbiting every 2.3 days around its host star. Its composition is consistent with an Earth-like planet, and it adds up to the rocky population of subNeptunes lying below the density gap identified around M dwarfs. With a ∼ 13% precision in mass, a∼ 7% radius precision, and a warm equilibrium temperature of Teq =543K, TOI-771 b is a particularly interesting target for atmospheric characterisation with JWST, and it is indeed one of the targets under consideration for the Rocky World DDT programme. Additionally, we discover the presence of a second, non-transiting planet in the system, TOI-771 c, with a period of 7.61 days and a minimum mass of Mp sin i = 2.87 (error ‑0.38;+0.41)M⊕. Even though the inclination is not directly constrained, the planet likely belongs to the temperate sub-Neptune population, with an equilibrium temperature of ∼ 365K.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lacedelli, G.; Astrophysical Institute of the Canaries
Pallé, E.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Davis, Y. T.; University of Birmingham, School of Physics and Astronomy
Luque, R.; University of Chicago, Department of Astronomy and Astrophysics
Morello, G.; Institute of Astrophysics of Andalusia, -
Tabernero, H. M.; Institut d'Estudis Espacials de Catalunya (IEEC), Edifici RDIT, Campus UPC, 08860, Castelldefels (Barcelona), Spain, Institut de Ciències de l'Espai (ICE,CSIC), Campus UAB, c/ de Can Magrans s/n, 08193, Cerdanyola del Vallès, Barcelona, Spain
Zapatero Osorio, M. R.; Center for Astrobiology, Madrid
Pozuelos, F. J.; Institute of Astrophysics of Andalusia
Jankowski, D.; Nicolaus Copernicus University, Astronomical Institute
Nowak, G.; Nicolaus Copernicus University, Astronomical Institute
Murgas, F.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Orell-Miquel, J.; University of Texas, Austin, Department of Astronomy, Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Akana Murphy, J. M.; University of California, Santa Cruz, Department of Astronomy and Astrophysics
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)
Charbonneau, D.; Harvard Smithsonian Center for Astrophysics
Dransfield, G.; University of Oxford, Department of Astrophysics, University of Oxford Magdalen College, University of Birmingham, School of Physics and Astronomy
Ducrot, E.; Institute for Particle Physics and Astrophysics, ETH Zürich, Wolfgang-Pauli-Strasse 2, 8093, Zürich, Switzerland
Geraldía-González, S.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Irwin, J.; Institute for Astronomy, University of Cambridge, Madingely Road, Cambridge, CB3 0HA, UK
Jehin, Emmanuel ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Osborne, H. L. M.; University College London, Mullard Space Science Laboratory
Pedersen, P. P.; University of Cambridge, Department of Physics, -
Rackham, B. V.; MIT, Department of Earth and Planetary Science
Scott, M. G.; University of Birmingham, School of Physics and Astronomy
Timmermans, Mathilde ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)
Triaud, A.; University of Birmingham, School of Physics and Astronomy
Van Eylen, V.; University College London, Mullard Space Science Laboratory
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