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  • Osborn, H. P.Massachusetts Institute of Technology (MIT),Universität Bern,University of Bern,Massachusetts Institute of Technology (author)

Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:5f2e2490-50f8-4c0b-b32b-654af8eb55f5
  • https://research.chalmers.se/publication/536471URI
  • https://doi.org/10.1093/mnras/stad1319DOI
  • https://lup.lub.lu.se/record/e6e1dfb5-e918-4ecb-9a37-7b1594c1d3cbURI

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  • Language:English
  • Summary in:English

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

Notes

  • HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08+−000512M☉) orbiting at 26.0+−111900 au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.

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  • Nowak, G.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias,Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University,European Space Research and Technology Centre (ESA ESTEC) (author)
  • Hebrard, G.Institut d 'Astrophysique de Paris,Stockholms universitet,Stockholm University (author)
  • Masseron, T.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Lillo-Box, J.European Space Astronomy Centre (ESAC) (author)
  • Palle, E.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Bekkelien, A.Université de Genève,University of Geneva,National Aeronautics and Space Administration (NASA) (author)
  • Florén, H.-G.Stockholms universitet,Stockholm University (author)
  • Guterman, P.Laboratoire d'Astrophysique de Marseille (author)
  • Simon, A.E.Universität Bern,University of Bern,Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Adibekyan, V.Universidade do Porto,University of Porto,Massachusetts Institute of Technology (MIT) (author)
  • Bieryla, AllysonHarvard-Smithsonian Center for Astrophysics (author)
  • Borsato, L.Istituto nazionale di astrofisica (INAF),National Aeronautics and Space Administration (NASA) (author)
  • Brandeker, A.Stockholms universitet,Stockholm University (author)
  • Ciardi, D. R.National Aeronautics and Space Administration (NASA) (author)
  • Collier Cameron, A.University of St Andrews (author)
  • Collins, K. A.Harvard-Smithsonian Center for Astrophysics (author)
  • Egger, J. A.Universität Bern,University of Bern,European Space Research and Technology Centre (ESA ESTEC) (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Hooton, M.J.University Of Cambridge,Universität Bern,University of Bern,Universität Wien,University of Vienna (author)
  • Latham, D. W.Harvard-Smithsonian Center for Astrophysics,Universite de Liège,University of Liège (author)
  • Lendl, M.Université de Genève,University of Geneva (author)
  • Matthews, E. C.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Université de Genève,University of Geneva (author)
  • Tuson, A.University Of Cambridge (author)
  • Ulmer-Moll, S.Université de Genève,University of Geneva (author)
  • Vanderburg, A.Massachusetts Institute of Technology (MIT) (author)
  • Wilson, T.G.University of St Andrews (author)
  • Ziegler, C.Stephen F. Austin State University (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,European Space Astronomy Centre (ESAC) (author)
  • Arnold, L.Centre national de la recherche scientifique (CNRS),Danmarks Tekniske Universitet,Technical University of Denmark,Institut d 'Astrophysique de Paris (author)
  • Asquier, J.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Y Navascues, D. BarradoCentro de Astrobiologia (CAB) (author)
  • Baumjohann, W. (author)
  • Beck, T.Universität Bern,University of Bern (author)
  • Belinski, A. A.M. V. Lomonosov Moscow State University (author)
  • Benz, W.Universität Bern,University of Bern (author)
  • Biondi, F.Istituto nazionale di astrofisica (INAF),University of Arizona (author)
  • Boisse, I.Laboratoire d'Astrophysique de Marseille (author)
  • Bonfils, X. (author)
  • Broeg, C.Universität Bern,University of Bern (author)
  • Buchhave, L. A.Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Bárczy, T. (author)
  • Barros, S.C.C.Universidade do Porto,University of Porto,Institut de Physique du Globe de Paris,Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Cabrera, J.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Guillen, C. CardonaInstituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Carleo, IlariaInstituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Castro-González, A.European Space Astronomy Centre (ESAC) (author)
  • Charnoz, S.Institut de Physique du Globe de Paris (author)
  • Christiansen, Jessie L.National Aeronautics and Space Administration (NASA),Observatoire de Paris,Paris Observatory,Université de Genève,University of Geneva (author)
  • Cortés-Zuleta, PíaLaboratoire d'Astrophysique de Marseille (author)
  • Csizmadia, SzilardDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Dalal, S.Institut d 'Astrophysique de Paris (author)
  • Davies, M.B.Lund University,Lunds universitet,Matematik (naturvetenskapliga fakulteten),Matematikcentrum,Institutioner vid LTH,Lunds Tekniska Högskola,LU profilområde: Naturlig och artificiell kognition,Lunds universitets profilområden,Mathematics (Faculty of Sciences),Centre for Mathematical Sciences,Departments at LTH,Faculty of Engineering, LTH,LU Profile Area: Natural and Artificial Cognition,Lund University Profile areas,Istituto nazionale di astrofisica (INAF),Google Inc.(Swepub:lu)astr-mda (author)
  • Deleuil, M.Laboratoire d'Astrophysique de Marseille (author)
  • Delfosse, X. (author)
  • Delrez, L.Universite de Liège,University of Liège (author)
  • Demory, B.O.Universität Bern,University of Bern (author)
  • Dunlavey, A. B.National Aeronautics and Space Administration (NASA) (author)
  • Ehrenreich, D.Université de Genève,University of Geneva (author)
  • Erikson, AndersDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Fernandes, R. B.University of Arizona (author)
  • Fortier, A.Universität Bern,University of Bern (author)
  • Forveille, T. (author)
  • Fossati, L. (author)
  • Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)(Swepub:cth)malfri (author)
  • Gillon, MichaëlUniversite de Liège,University of Liège (author)
  • Goeke, RobertMassachusetts Institute of Technology (MIT) (author)
  • Goliguzova, M. V.M. V. Lomonosov Moscow State University (author)
  • Gonzales, E.University of California (author)
  • Günther, Maximilian N.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Gudel, M.Universität Wien,University of Vienna (author)
  • Heidari, N.Laboratoire d'Astrophysique de Marseille (author)
  • Henze, C. E.NASA Ames Research Center (author)
  • Howell, S. B.NASA Ames Research Center (author)
  • Hoyer, S.Laboratoire d'Astrophysique de Marseille (author)
  • Frey, J. I.Universität Bern,University of Bern (author)
  • Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Jenkins, Jon M.NASA Ames Research Center,Space Telescope Science Institute (STScI) (author)
  • Kiefer, F.Institut d 'Astrophysique de Paris,Observatoire de Paris,Paris Observatory (author)
  • Kiss, L.L.Eötvös Loránd University (ELTE),Magyar Tudomanyos Akademia,Hungarian Academy of Sciences (author)
  • Korth, Judith,1987Chalmers University of Technology,Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Chalmers tekniska högskola(Swepub:lu)ju7237ko (author)
  • Maxted, P.Keele University (author)
  • Laskar, J.Observatoire de Paris,Paris Observatory,Swarthmore College (author)
  • des Etangs, A. L.Institut d 'Astrophysique de Paris (author)
  • Lovis, C.Université de Genève,University of Geneva (author)
  • Lund, M. B.National Aeronautics and Space Administration (NASA) (author)
  • Luque, R.University of Chicago (author)
  • Magrin, D.Istituto nazionale di astrofisica (INAF) (author)
  • Almenara, J. M. (author)
  • Martioli, E.Institut d 'Astrophysique de Paris (author)
  • Mecina, M.Universität Wien,University of Vienna,European Space Astronomy Centre (ESAC) (author)
  • Medina, J. V.Space Telescope Science Institute (STScI) (author)
  • Moldovan, D.Google Inc. (author)
  • Morales-Calderon, M.European Space Astronomy Centre (ESAC),Institut de Recherche en Astrophysique et Planétologie (IRAP) (author)
  • Morello, GiuseppeInstituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Moutou, C.Institut de Recherche en Astrophysique et Planétologie (IRAP) (author)
  • Murgas, F.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Jensen, Eric L.N.Swarthmore College (author)
  • Winn, J.N.Princeton University (author)
  • Massachusetts Institute of Technology (MIT)Universität Bern (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society523:2, s. 3069-30890035-87111365-2966

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