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HD 89345: A bright ...
HD 89345: A bright oscillating star hosting a transiting warm Saturn-sized planet observed by K2
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- Van Eylen, Vincent (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Dai, Fei (author)
- Princeton University,Massachusetts Institute of Technology (MIT)
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- Mathur, S. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Gandolfi, D. (author)
- Universita degli Studi di Torino,University of Turin
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- Albrecht, Simon (author)
- Århus Universitet,Aarhus University
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- Fridlund, Malcolm, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)
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- García, R. A. (author)
- Université Paris-Saclay,University Paris-Saclay,Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA)
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- Guenther, E. W. (author)
- Thüringer Landessternwarte Tautenburg
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- Hjorth, M. (author)
- Århus Universitet,Aarhus University
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- Justesen, A.B. (author)
- Århus Universitet,Aarhus University
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- Livingston, J.H. (author)
- University of Tokyo, Japan
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- Lund, M. N. (author)
- Århus Universitet,Aarhus University
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- Pérez Hernández, F. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Prieto-Arranz, J. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Regulo, C. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Bugnet, L. (author)
- Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA),Université Paris-Saclay,University Paris-Saclay
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Everett, M.E. (author)
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- Hirano, T. (author)
- Tokyo Institute of Technology
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- Nespral, David (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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- Palle, E. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Silva Aguirre, V. (author)
- Århus Universitet,Aarhus University
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- Trifonov, T. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Winn, J. N. (author)
- Princeton University
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- Barragán, O. (author)
- Universita degli Studi di Torino,University of Turin
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- Beck, P. G. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Chaplin, W. J. (author)
- Århus Universitet,Aarhus University,University of Birmingham
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- Cochran, William D. (author)
- The University of Texas at Austin, USA
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- Csizmadia, Szilard (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Deeg, H. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Endl, M. (author)
- The University of Texas at Austin, USA
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Heeren, P. (author)
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- Grziwa, S. (author)
- Universität zu Köln,University of Cologne
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- Hatzes, A. (author)
- Thüringer Landessternwarte Tautenburg
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- Hidalgo, D. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Korth, Judith (author)
- Universität zu Köln,University of Cologne
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- Mathis, S. (author)
- Université Paris-Saclay,University Paris-Saclay,Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA)
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- Montanés Rodríguez, P. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Narita, Norio (author)
- University of Tokyo, Japan,National Institutes of Natural Sciences (NINS)
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- Pätzold, Martin (author)
- Universität zu Köln,University of Cologne
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- Persson, Carina, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Rodler, F. (author)
- European Southern Observatory Santiago
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- Smith, Alexis M. S. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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(creator_code:org_t)
- 2018-05-29
- 2018
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 478:4, s. 4866-4880
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Abstract
Subject headings
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- We report the discovery and characterization of HD 89345b (K2-234b; EPIC 248777106b), a Saturn-sized planet orbiting a slightly evolved star. HD 89345 is a bright star (V = 9.3 mag) observed by the K2 mission with 1 min time sampling. It exhibits solar-like oscillations. We conducted asteroseismology to determine the parameters of the star, finding themass and radius to be 1.12-0.01+0.04M⊙and 1.657-0.004+0.020R⊙, respectively. The star appears to have recently left the main sequence, based on the inferred age, 9.4-1.3+0.4Gyr, and the non-detection of mixed modes. The star hosts a 'warm Saturn' (P = 11.8 d, Rp= 6.86 ± 0.14 R⊕). Radial-velocity follow-up observations performed with the FIbre-fed Echelle Spectrograph, HARPS, and HARPS-N spectrographs show that the planet has a mass of 35.7 ± 3.3 M⊕. The data also show that the planet's orbit is eccentric (e≈0.2). An investigation of the rotational splitting of the oscillation frequencies of the star yields no conclusive evidence on the stellar inclination angle. We further obtained Rossiter-McLaughlin observations, which result in a broad posterior of the stellar obliquity. The planet seems to confirm to the same patterns that have been observed for other sub-Saturns regarding planet mass and multiplicity, orbital eccentricity, and stellar metallicity.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap -- Bioinformatik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Bioinformatics (hsv//eng)
Keyword
- Planets and satellites: formation
- Asteroseismology
- Planets and satellites: fundamental parameters
- Planets and satellites: composition
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Van Eylen, Vince ...
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Dai, Fei
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Mathur, S.
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Gandolfi, D.
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Albrecht, Simon
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Fridlund, Malcol ...
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show more...
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García, R. A.
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Guenther, E. W.
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Hjorth, M.
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Justesen, A.B.
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Livingston, J.H.
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Lund, M. N.
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Pérez Hernández, ...
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Prieto-Arranz, J ...
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Regulo, C.
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Bugnet, L.
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Everett, M.E.
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Hirano, T.
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Nespral, David
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Nowak, G.
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Palle, E.
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Silva Aguirre, V ...
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Trifonov, T.
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Winn, J. N.
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Barragán, O.
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Beck, P. G.
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Chaplin, W. J.
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Cochran, William ...
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Csizmadia, Szila ...
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Deeg, H.
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Endl, M.
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Heeren, P.
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Grziwa, S.
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Hatzes, A.
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Hidalgo, D.
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Korth, Judith
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Mathis, S.
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Montanés Rodrígu ...
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Narita, Norio
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Pätzold, Martin
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Persson, Carina, ...
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Rodler, F.
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Smith, Alexis M. ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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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 Computer and Inf ...
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and Bioinformatics
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Monthly Notices ...
- By the university
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Chalmers University of Technology