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HD 191939 revisited...
HD 191939 revisited: New and refined planet mass determinations, and a new planet in the habitable zone
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- Orell-Miquel, J. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Nowak, G. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Murgas, F. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Palle, E. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Morello, Giuseppe (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Luque, R. (author)
- University of Chicago,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- Badenas-Agusti, M. (author)
- Massachusetts Institute of Technology (MIT)
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- Ribas, I. (author)
- 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)
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- Lafarga, Marina (author)
- The University of Warwick
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- Espinoza, Néstor (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Morales, J. C. (author)
- 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)
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- Zechmeister, M. (author)
- Georg-August-Universität Göttingen,University of Göttingen
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- Alqasim, A. (author)
- University College London (UCL)
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- Cochran, W. D. (author)
- The University of Texas at Austin, USA
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- Gandolfi, D. (author)
- Universita degli Studi di Torino,University of Turin
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- Goffo, E. (author)
- Universita degli Studi di Torino,University of Turin,Thüringer Landessternwarte Tautenburg
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- Kabath, Petr (author)
- Czech Academy of Sciences
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- Korth, Judith, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Lam, K. W.F. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Livingston, J. (author)
- National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Muresan, Alexandra, 1997 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Persson, Carina, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Van Eylen, Vincent (author)
- University College London (UCL)
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(creator_code:org_t)
- 2023-01-04
- 2023
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 669
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- Stars: individual: HD 191939
- Planets and satellites: individual: HD 191939 g
- Techniques: photometric
- Planets and satellites: individual: HD 191939 d
- Techniques: radial velocities
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Orell-Miquel, J.
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Nowak, G.
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Murgas, F.
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Palle, E.
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Morello, Giusepp ...
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Luque, R.
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show more...
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Badenas-Agusti, ...
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Ribas, I.
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Lafarga, Marina
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Espinoza, Néstor
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Morales, J. C.
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Zechmeister, M.
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Alqasim, A.
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Cochran, W. D.
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Gandolfi, D.
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Goffo, E.
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Kabath, Petr
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Korth, Judith, 1 ...
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Lam, K. W.F.
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Livingston, J.
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Muresan, Alexand ...
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Persson, Carina, ...
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Van Eylen, Vince ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Astronomy and As ...
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Chalmers University of Technology