TOI-1759 b: A transiting sub-Neptune around a low mass star characterized with SPIRou and TESS

Autor: E. Martioli, G. Hébrard, P. Fouqué, É. Artigau, J.-F. Donati, C. Cadieux, S. Bellotti, A. Lecavelier des Etangs, R. Doyon, J.-D. do Nascimento, L. Arnold, A. Carmona, N. J. Cook, P. Cortes-Zuleta, L. de Almeida, X. Delfosse, C. P. Folsom, P.-C. König, C. Moutou, M. Ould-Elhkim, P. Petit, K. G. Stassun, A. A. Vidotto, T. Vandal, B. Benneke, I. Boisse, X. Bonfils, P. Boyd, C. Brasseur, D. Charbonneau, R. Cloutier, K. Collins, P. Cristofari, I. Crossfield, R. F. Díaz, M. Fausnaugh, P. Figueira, T. Forveille, E. Furlan, E. Girardin, C. L. Gnilka, J. Gomes da Silva, P.-G. Gu, P. Guerra, S. B. Howell, G. A. J. Hussain, J. M. Jenkins, F. Kiefer, D. W. Latham, R. A. Matson, E. C. Matthews, J. Morin, R. Naves, G. Ricker, S. Seager, M. Takami, J. D. Twicken, A. Vanderburg, R. Vanderspek, J. Winn
Přispěvatelé: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de Montréal (UdeM), Universidade Federal do Rio Grande do Norte [Natal] (UFRN), Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Université Grenoble Alpes (UGA), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France, Vanderbilt University [Nashville], Universiteit Leiden, Département de Physique [Montréal], University of British Columbia (UBC), Space Telescope Science Institute (STSci), Center for Astrophysics (emeritus), Harvard-Smithsonian, Cambridge, MA, USA, Université du Québec à Rimouski (UQAR), SETI Institute, University of Kansas [Kansas City], International Center for Advanced Studies (ICAS) and ICIFI (CONICET), Massachusetts Institute of Technology (MIT), European Southern Observatory (ESO), NASA ExoPlanet Science Institute (NExScI), California Institute of Technology (CALTECH), Grand Pra Observatory, Universidade do Porto = University of Porto, Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Observatori Astronòmic Albanyà, NASA Ames Research Center (ARC), European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), U.S. Naval Observatory, Observatoire Astronomique de l'Université de Genève (ObsGE), Université de Genève = University of Geneva (UNIGE), Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Academia Sinica, Peyton Hall, ANR-15-IDEX-0002,UGA,IDEX UGA(2015), ANR-18-CE31-0019,SPlaSH,Recherche de planètes habitables avec SPIRou(2018), European Project: 740651,New Worlds
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2022, 660, pp.A86. ⟨10.1051/0004-6361/202142540⟩
Astronomy & Astrophysics, 660:A86
ISSN: 0004-6361
Popis: We report the detection and characterization of the transiting sub-Neptune TOI-1759 b, using photometric time-series from TESS and near infrared spectropolarimetric data from SPIRou on the CFHT. TOI-1759 b orbits a moderately active M0V star with an orbital period of $18.849975\pm0.000006$ d, and we measure a planetary radius and mass of $3.06\pm0.22$ R$_\oplus$ and $6.8\pm2.0$ M$_\oplus$. Radial velocities were extracted from the SPIRou spectra using both the CCF and the LBL methods, optimizing the velocity measurements in the near infrared domain. We analyzed the broadband SED of the star and the high-resolution SPIRou spectra to constrain the stellar parameters and thus improve the accuracy of the derived planet parameters. A LSD analysis of the SPIRou Stokes $V$ polarized spectra detects Zeeman signatures in TOI-1759. We model the rotational modulation of the magnetic stellar activity using a GP regression with a quasi-periodic covariance function, and find a rotation period of $35.65^{+0.17}_{-0.15}$ d. We reconstruct the large-scale surface magnetic field of the star using ZDI, which gives a predominantly poloidal field with a mean strength of $18\pm4$ G. Finally, we perform a joint Bayesian MCMC analysis of the TESS photometry and SPIRou RVs to optimally constrain the system parameters. At $0.1176\pm0.0013$ au from the star, the planet receives $6.4$ times the bolometric flux incident on Earth, and its equilibrium temperature is estimated at $433\pm14$ K. TOI-1759 b is a likely gas-dominated sub-Neptune with an expected high rate of photoevaporation. Therefore, it is an interesting target to search for neutral hydrogen escape, which may provide important constraints on the planetary formation mechanisms responsible for the observed sub-Neptune radius desert.
Accepted for publication in the 10. Planets and planetary systems section of Astronomy & Astrophysics
Databáze: OpenAIRE
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