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  • Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL) (author)

Planets observed with CHEOPS: Two super-Earths orbiting the red dwarf star TOI-776

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:1070af5c-cd2d-4277-80c6-880536f57a96
  • https://research.chalmers.se/publication/540622URI
  • https://doi.org/10.1051/0004-6361/202243838DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context. M-dwarf stars are the most common of potential exoplanet host stars in the Galaxy. It is therefore very important to understand planetary systems orbiting such stars and to determine the physical parameters of such planets with high precision. Also with the launch of the James Webb Space Telescope (JWST) the observation of atmospheric parameters of planets orbiting these stars has begun. It is therefore required to determine properties of potential targets. Aims. Two planets around the red dwarf TOI-776 were detected by TESS. The objective of our study was to use transit observations obtained by the CHEOPS space mission to improve the current precision of the planetary radii, as well as additional radial velocity (RV) data in order to improve mass estimates of the two planets. Using these quantities, we wanted to derive the bulk densities of those planets, improving the precision in earlier results, and use this information to put them in context of other exoplanetary systems involving very low mass stars. Methods. Utilizing new transit data from the CHEOPS satellite and its photometric telescope, we obtained very high precision planetary transit measurements. Interpretation of these provides updated planetary radii, along with other system parameters. A concurrent ESO large observing program using the high precision spectrograph HARPS has doubled the available radial velocity data. Calculating the power spectrum of a number of stellar activity indices we update the previously estimated stellar rotation period to a lower value. Results. The CHEOPS data provide precise transit depths of 909 and 1177 ppm translating into radii of Rb = 1.798-0.077+0.078 R⊕ and Rc = 2.047-0.078+0.081 R⊕, respectively. Our interpretation of the radial velocities and activity indicator time series data estimates a stellar rotation period for this early M dwarf of ~21.1 days. A further multi-dimensional Gaussian process approach confirm this new estimate. By performing a Skew-Normal (SN) fit onto the Cross Correlation Functions we extracted the RV data and the activity indicators to estimate the planetary masses, obtaining Mb = 5.0-1.6+1.6 M⊕ and Mc = 6.9-2.5+2.6 M⊕. Conclusions. We improve the precision in planetary radius for TOI-776 b and c by a factor of more than two. Our data and modelling give us parameters of both bodies consistent with mini-Neptunes, albeit with a relatively high density. The stellar activity of TOI-776 is found to have increased by a factor larger than 2 since the last set of observations.

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  • Georgieva, Iskra,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)iskrag (author)
  • Bonfanti, A. (author)
  • Alibert, Y.Universität Bern,University of Bern (author)
  • Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Beck, M.Université de Genève,University of Geneva (author)
  • Deline, A.Université de Genève,University of Geneva (author)
  • Hoyer, S.Laboratoire d'Astrophysique de Marseille (author)
  • Olofsson, G.Stockholms universitet,Stockholm University (author)
  • Wilson, T.G.University of St Andrews (author)
  • Barragán, O.University Of Oxford (author)
  • Fossati, L. (author)
  • Mustill, A. J.Lunds universitet,Lund University (author)
  • Brandeker, A.Stockholms universitet,Stockholm University (author)
  • Hatzes, A.Thüringer Landessternwarte Tautenburg (author)
  • Florén, H.-G.Stockholms universitet,Stockholm University (author)
  • Simola, Umberto (author)
  • Hooton, M.J.Universität Bern,University of Bern,University Of Cambridge (author)
  • Luque, R.Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),University of Chicago (author)
  • Sousa, S. G.Universidade do Porto,University of Porto (author)
  • Egger, J. A.Universität Bern,University of Bern (author)
  • Antoniadis-Karnavas, A.Universidade do Porto,University of Porto (author)
  • Salmon, S.Université de Genève,University of Geneva (author)
  • Adibekyan, V.Universidade do Porto,University of Porto (author)
  • Alonso, R.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Anglada, G.Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC,Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC) (author)
  • Bárczy, T. (author)
  • Barrado Navascues, D.European Space Astronomy Centre (ESAC) (author)
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  • Beck, T.Universität Bern,University of Bern (author)
  • Benz, W.Universität Bern,University of Bern (author)
  • Bonfils, X. (author)
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  • Charnoz, S.Institut de Physique du Globe de Paris (author)
  • Collier Cameron, A.University of St Andrews (author)
  • Csizmadia, SzilardDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Davies, M. B.Lunds universitet,Lund University (author)
  • Deeg, H.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Deleuil, M.Laboratoire d'Astrophysique de Marseille (author)
  • Delrez, L.Universite de Liège,University of Liège (author)
  • Demangeon, O.Universidade do Porto,University of Porto (author)
  • Demory, B.O.Universität Bern,University of Bern (author)
  • Ehrenreich, D.Université de Genève,University of Geneva (author)
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  • Esposito, M.Thüringer Landessternwarte Tautenburg (author)
  • Fortier, A.Universität Bern,University of Bern (author)
  • Gillon, MichaëlUniversite de Liège,University of Liège (author)
  • Gudel, M.Universität Wien,University of Vienna (author)
  • Heng, KevinUniversity Of Leicester,Universität Bern,University of Bern (author)
  • Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Kiss, L. L.Magyar Tudomanyos Akademia,Hungarian Academy of Sciences,Eötvös Loránd University (ELTE) (author)
  • Korth, JudithLunds universitet,Lund University (author)
  • Laskar, J.Observatoire de Paris,Paris Observatory (author)
  • des Etangs, A. L.Institut d 'Astrophysique de Paris (author)
  • Lendl, M.Université de Genève,University of Geneva (author)
  • Livingston, J.H.University of Tokyo, Japan,The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan (author)
  • Lovis, C.Université de Genève,University of Geneva (author)
  • Magrin, D.Istituto nazionale di astrofisica (INAF) (author)
  • Maxted, P.Keele University (author)
  • Muresan, A. (author)
  • Nascimbeni, ValerioIstituto nazionale di astrofisica (INAF) (author)
  • Ottensamer, R.Universität Wien,University of Vienna (author)
  • Pagano, I.Istituto nazionale di astrofisica (INAF) (author)
  • Palle, EnricInstituto de Astrofísica de Canarias (author)
  • Peter, G.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Piotto, Giampaolo P.Università Degli Studi di Padova,University of Padua,Istituto nazionale di astrofisica (INAF) (author)
  • Pollacco, D.The University of Warwick (author)
  • Queloz, D.University Of Cambridge,Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH) (author)
  • Ragazzoni, R.Istituto nazionale di astrofisica (INAF),Università Degli Studi di Padova,University of Padua (author)
  • Rando, N.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Rauer, H.Freie Universität Berlin,Technische Universität Berlin,Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Redfield, S.Wesleyan University (author)
  • Ribas, I.Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC),Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC (author)
  • Santos, N. C.Universidade do Porto,University of Porto (author)
  • Scandariato, GaetanoIstituto nazionale di astrofisica (INAF) (author)
  • Segransan, D.Université de Genève,University of Geneva (author)
  • Serrano, L. M.Universita degli Studi di Torino,University of Turin (author)
  • Simon, A.E.Universität Bern,University of Bern (author)
  • Smith, A. M.S.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Steller, Manfred B. (author)
  • Szabó, G.M.Eötvös Loránd University (ELTE) (author)
  • Thomas, NicolasUniversität Bern,University of Bern (author)
  • Udry, S.Université de Genève,University of Geneva (author)
  • Van Eylen, VincentUniversity College London (UCL) (author)
  • Van Grootel, V.Universite de Liège,University of Liège (author)
  • Walton, N. A.University Of Cambridge (author)
  • Chalmers tekniska högskolaUniversiteit Leiden (UL) (creator_code:org_t)

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  • In:Astronomy and Astrophysics6840004-63611432-0746

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Fridlund, Malcol ...
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Bonfanti, A.
Alibert, Y.
Persson, Carina, ...
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Hoyer, S.
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Hatzes, A.
Florén, H.-G.
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Hooton, M.J.
Luque, R.
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Egger, J. A.
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Salmon, S.
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Demangeon, O.
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Korth, Judith
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