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  • Hoyer, S.Laboratoire d'Astrophysique de Marseille,Aix-Marseille University (author)

Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-12-13
  • EDP Sciences,2022
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:1f4097b7-2d0f-469c-9a95-170ee3519c28
  • https://research.chalmers.se/publication/534054URI
  • https://doi.org/10.1051/0004-6361/202243720DOI
  • https://lup.lub.lu.se/record/1155ee54-1312-480b-81f4-1d0f55f318a8URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-214876URI

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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. The HD 108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54 d was serendipitously detected by CHEOPS. In this way, HD 108236 (V = 9.2) became one of the brightest stars known to host five small transiting planets (Rp < 3 Ro˙). Aims. We characterize the planetary system by using all the data available from CHEOPS and TESS space missions. We use the flexible pointing capabilities of CHEOPS to follow up the transits of all the planets in the system, including the fifth transiting body. Methods. After updating the host star parameters by using the results from Gaia eDR3, we analyzed 16 and 43 transits observed by CHEOPS and TESS, respectively, to derive the planets' physical and orbital parameters. We carried out a timing analysis of the transits of each of the planets of HD 108236 to search for the presence of transit timing variations. Results. We derived improved values for the radius and mass of the host star (R∗ = 0.876 ± 0.007 R0 and M∗ = 0.867-0.046+0.047M). We confirm the presence of the fifth transiting planet f in a 29.54 d orbit. Thus, the HD 108236 system consists of five planets of Rb = 1.587±0.028, Rc = 2.122±0.025, Rd = 2.629 ± 0.031, Re = 3.008 ± 0.032, and Rf = 1.89 ± 0.04 [Ro˙]. We refine the transit ephemeris for each planet and find no significant transit timing variations for planets c, d, and e. For planets b and f, instead, we measure significant deviations on their transit times (up to 22 and 28 min, respectively) with a non-negligible dispersion of 9.6 and 12.6 min in their time residuals. Conclusions. We confirm the presence of planet f and find no significant evidence for a potential transiting planet in a 10.9 d orbital period, as previously suggested. Further monitoring of the transits, particularly for planets b and f, would confirm the presence of the observed transit time variations. HD 108236 thus becomes a key multi-planetary system for the study of formation and evolution processes. The reported precise results on the planetary radii - together with a profuse RV monitoring - will allow for an accurate characterization of the internal structure of these planets.

Subject headings and genre

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  • Bonfanti, A. (author)
  • Leleu, A.Université de Genève,University of Geneva,Universität Bern,University of Bern (author)
  • Acuña, L.Laboratoire d'Astrophysique de Marseille (author)
  • Serrano, L. M.Universita degli Studi di Torino,University of Turin (author)
  • Deleuil, M.Laboratoire d'Astrophysique de Marseille (author)
  • Bekkelien, A.Université de Genève,University of Geneva (author)
  • Broeg, C.Universität Bern,University of Bern (author)
  • Florén, Hans Gustav AxelStockholms universitet,Institutionen för astronomi(Swepub:su)flore (author)
  • Queloz, D.University Of Cambridge,Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH) (author)
  • Wilson, T.G.University of St Andrews (author)
  • Sousa, S.G.Universidade do Porto,University of Porto (author)
  • Hooton, M.J.University Of Cambridge,Universität Bern,University of Bern (author)
  • Adibekyan, V.Universidade do Porto,University of Porto (author)
  • Alibert, Y.Universität Bern,University of Bern (author)
  • Alonso, R.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Anglada, G.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)
  • Asquier, J.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Bárczy, T. (author)
  • Davies, M.B.Lund University,Lunds universitet,Matematik (naturvetenskapliga fakulteten),Matematikcentrum,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematics (Faculty of Sciences),Centre for Mathematical Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)astr-mda (author)
  • Barros, S.C.C.Universidade do Porto,University of Porto (author)
  • Baumjohann, W. (author)
  • Beck, M.Université de Genève,University of Geneva (author)
  • Beck, T.Universität Bern,University of Bern (author)
  • Benz, W.Universität Bern,University of Bern (author)
  • Billot, N.Université de Genève,University of Geneva (author)
  • Biondi, F.Istituto nazionale di astrofisica (INAF),Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Bonfils, X. (author)
  • Brandeker, AlexisStockholms universitet,Institutionen för astronomi(Swepub:su)alexis (author)
  • Cabrera, J.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • 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)
  • 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)
  • Erikson, AndersDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Fortier, A.Universität Bern,University of Bern (author)
  • Fossati, L. (author)
  • Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)(Swepub:cth)malfri (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Gillon, MichaëlUniversite de Liège,University of Liège (author)
  • Gudel, M.Universität Wien,University of Vienna (author)
  • Hara, N.C.Université de Genève,University of Geneva (author)
  • Heng, KevinThe University of Warwick,Universität Bern,University of Bern (author)
  • Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Jenkins, Jon M.NASA Ames Research Center (author)
  • Kiss, L.Magyar Tudomanyos Akademia,Hungarian Academy of Sciences,Eötvös Loránd University (ELTE) (author)
  • Laskar, J.Observatoire de Paris,Paris Observatory (author)
  • Latham, D. W.Harvard-Smithsonian Center for Astrophysics (author)
  • des Etangs, A. L.Institut d 'Astrophysique de Paris (author)
  • Lendl, M.Université de Genève,University of Geneva (author)
  • Lovis, C.Université de Genève,University of Geneva (author)
  • Luntzer, A.Universität Wien,University of Vienna (author)
  • Magrin, D.Istituto nazionale di astrofisica (INAF) (author)
  • Maxted, P.Keele University (author)
  • Nascimbeni, ValerioIstituto nazionale di astrofisica (INAF) (author)
  • Olofsson, Göran,1944-Stockholms universitet,Institutionen för astronomi(Swepub:su)olofsson (author)
  • Ottensamer, R.Universität Wien,University of Vienna (author)
  • Pagano, I.Istituto nazionale di astrofisica (INAF) (author)
  • Palle, EnricInstituto de Astrofísica de Canarias (author)
  • Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
  • Peter, G.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Piazza, D.Universität Bern,University of Bern (author)
  • Piotto, Giampaolo P.Università Degli Studi di Padova,University of Padua,Istituto nazionale di astrofisica (INAF) (author)
  • Pollacco, Don L.The University of Warwick (author)
  • Ragazzoni, RobertoIstituto 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,Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Technische Universität Berlin (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)
  • Ricker, George R.Massachusetts Institute of Technology (MIT) (author)
  • Salmon, S.Université de Genève,University of Geneva (author)
  • Santos, N. C.Universidade do Porto,University of Porto (author)
  • Scandariato, GaetanoIstituto nazionale di astrofisica (INAF) (author)
  • Seager, S.Massachusetts Institute of Technology (MIT) (author)
  • Segransan, D.Université de Genève,University of Geneva (author)
  • Simon, A.E.Universität Bern,University of Bern (author)
  • Smith, Alexis 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)
  • Twicken, J. D.NASA Ames Research Center,SETI Institute (author)
  • Udry, S.Université de Genève,University of Geneva (author)
  • Van Grootel, V.Universite de Liège,University of Liège (author)
  • Vanderspek, Roland K.Massachusetts Institute of Technology (MIT) (author)
  • Walton, N. A.University Of Cambridge (author)
  • Westerdorff, K.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Winn, J. N.Princeton University (author)
  • Laboratoire d'Astrophysique de MarseilleAix-Marseille University (creator_code:org_t)

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  • In:Astronomy and Astrophysics: EDP Sciences6680004-63611432-0746

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Hoyer, S.
Bonfanti, A.
Leleu, A.
Acuña, L.
Serrano, L. M.
Deleuil, M.
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Broeg, C.
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Alibert, Y.
Alonso, R.
Anglada, G.
Asquier, J.
Bárczy, T.
Davies, M.B.
Barros, S.C.C.
Baumjohann, W.
Beck, M.
Beck, T.
Benz, W.
Billot, N.
Biondi, F.
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Charnoz, S.
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Davies, M. B.
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Erikson, Anders
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Gillon, Michaël
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Laskar, J.
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Lovis, C.
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