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Search: id:"swepub:oai:research.chalmers.se:0ba4c7be-e4af-45a0-921a-1b1397fc88c5" > HD 191939 revisited...

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  • Orell-Miquel, J.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)

HD 191939 revisited: New and refined planet mass determinations, and a new planet in the habitable zone

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023-01-04
  • EDP Sciences,2023
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:0ba4c7be-e4af-45a0-921a-1b1397fc88c5
  • https://research.chalmers.se/publication/534151URI
  • https://doi.org/10.1051/0004-6361/202244120DOI

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  • Language:English
  • Summary in:English

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

Notes

  • HD 191939 (TOI-1339) is a nearby (d = 54 pc), bright (V = 9 mag), and inactive Sun-like star (G9 V) known to host a multi-planet transiting system. Ground-based spectroscopic observations confirmed the planetary nature of the three transiting sub-Neptunes (HD 191939 b, c, and d) originally detected by TESS and were used to measure the masses for planets b and c with 3Ï precision. These previous observations also reported the discovery of an additional Saturn-mass planet (HD 191939 e) and evidence for a further, very long-period companion (HD 191939 f). Here, we report the discovery of a new non-transiting planet in the system and a refined mass determination of HD 191939 d. The new planet, HD 191939 g, has a minimum mass of 13.5±2.0 M- and a period of about 280 days. This period places the planet within the conservative habitable zone of the host star, and near a 1:3 resonance with HD 191939 e. The compilation of 362 radial velocity measurements with a baseline of 677 days from four different high-resolution spectrographs also allowed us to refine the properties of the previously known planets, including a 4.6Ï mass determination for planet d, for which only a 2Ï upper limit had been set until now. We confirm the previously suspected low density of HD 191939 d, which makes it an attractive target for attempting atmospheric characterisation. Overall, the planetary system consists of three sub-Neptunes interior to a Saturn-mass and a Uranus-mass planet plus a high-mass long-period companion. This particular configuration has no counterpart in the literature and makes HD 191939 an exceptional multi-planet transiting system with an unusual planet demographic worthy of future observation.

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  • Nowak, G.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Murgas, F.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Palle, E.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias (author)
  • Morello, GiuseppeInstituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Luque, R.University of Chicago,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA) (author)
  • Badenas-Agusti, M.Massachusetts Institute of Technology (MIT) (author)
  • Ribas, I.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)
  • Lafarga, MarinaThe University of Warwick (author)
  • Espinoza, NéstorMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Morales, J. C.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)
  • Zechmeister, M.Georg-August-Universität Göttingen,University of Göttingen (author)
  • Alqasim, A.University College London (UCL) (author)
  • Cochran, W. D.The University of Texas at Austin, USA (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Goffo, E.Universita degli Studi di Torino,University of Turin,Thüringer Landessternwarte Tautenburg (author)
  • Kabath, PetrCzech Academy of Sciences (author)
  • Korth, Judith,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)korth (author)
  • Lam, K. W.F.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Livingston, J.National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI) (author)
  • Muresan, Alexandra,1997Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)muresan (author)
  • Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
  • Van Eylen, VincentUniversity College London (UCL) (author)
  • Instituto de Astrofísica de CanariasUniversidad de la Laguna (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6690004-63611432-0746

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