Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65

W. J. Chaplin; R. Sanchis-Ojeda; T. L. Campante; R. Handberg; D. Stello; J. N. Winn; S. Basu; Jørgen Christensen-Dalsgaard; G. R. Davies; T. S. Metcalfe; Lars A. Buchhave; D. A. Fischer; T. R. Bedding; W. D. Cochran; Y. Elsworth; R. L. Gilliland; S. Hekker; D. Huber; H. Isaacson; Christoffer Karoff; S. D. Kawaler; H. Kjeldsen; D. W. Latham; M. N. Lund; M. Lundkvist; G. W. Marcy; A. Miglio; T. Barclay; J. J. Lissauer

doi:10.1088/0004-637X/766/2/101

Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65

W. J. Chaplin, R. Sanchis-Ojeda, T. L. Campante, R. Handberg, D. Stello, J. N. Winn, S. Basu, Jørgen Christensen-Dalsgaard, G. R. Davies, T. S. Metcalfe, Lars A. Buchhave, D. A. Fischer, T. R. Bedding, W. D. Cochran, Y. Elsworth, R. L. Gilliland, S. Hekker, D. Huber, H. Isaacson, Christoffer KaroffS. D. Kawaler, H. Kjeldsen, D. W. Latham, M. N. Lund, M. Lundkvist, G. W. Marcy, A. Miglio, T. Barclay, J. J. Lissauer

Astrophysics and Planetary Science

115 Citations (Scopus)

Abstract

Results on the obliquity of exoplanet host stars - the angle between the stellar spin axis and the planetary orbital axis - provide important diagnostic information for theories describing planetary formation. Here we present the first application of asteroseismology to the problem of stellar obliquity determination in systems with transiting planets and Sun-like host stars. We consider two systems observed by the NASA Kepler mission which have multiple transiting small (super-Earth sized) planets: the previously reported Kepler-50 and a new system, Kepler-65, whose planets we validate in this paper. Both stars show rich spectra of solar-like oscillations. From the asteroseismic analysis we find that each host has its rotation axis nearly perpendicular to the line of sight with the sines of the angles constrained at the 1σ level to lie above 0.97 and 0.91, respectively. We use statistical arguments to show that coplanar orbits are favored in both systems, and that the orientations of the planetary orbits and the stellar rotation axis are correlated.

Original language	English
Article number	101
Journal	The Astrophysical Journal
Volume	766
Issue number	2
Number of pages	19
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/766/2/101
Publication status	Published - 1 Apr 2013

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Chaplin, W. J., Sanchis-Ojeda, R., Campante, T. L., Handberg, R., Stello, D., Winn, J. N., Basu, S., Christensen-Dalsgaard, J., Davies, G. R., Metcalfe, T. S., Buchhave, L. A., Fischer, D. A., Bedding, T. R., Cochran, W. D., Elsworth, Y., Gilliland, R. L., Hekker, S., Huber, D., Isaacson, H., ... Lissauer, J. J. (2013). Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65. The Astrophysical Journal, 766(2), [101]. https://doi.org/10.1088/0004-637X/766/2/101

Chaplin, WJ, Sanchis-Ojeda, R, Campante, TL, Handberg, R, Stello, D, Winn, JN, Basu, S, Christensen-Dalsgaard, J, Davies, GR, Metcalfe, TS, Buchhave, LA, Fischer, DA, Bedding, TR, Cochran, WD, Elsworth, Y, Gilliland, RL, Hekker, S, Huber, D, Isaacson, H, Karoff, C, Kawaler, SD, Kjeldsen, H, Latham, DW, Lund, MN, Lundkvist, M, Marcy, GW, Miglio, A, Barclay, T & Lissauer, JJ 2013, 'Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65', The Astrophysical Journal, vol. 766, no. 2, 101. https://doi.org/10.1088/0004-637X/766/2/101

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title = "Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65",

abstract = "Results on the obliquity of exoplanet host stars - the angle between the stellar spin axis and the planetary orbital axis - provide important diagnostic information for theories describing planetary formation. Here we present the first application of asteroseismology to the problem of stellar obliquity determination in systems with transiting planets and Sun-like host stars. We consider two systems observed by the NASA Kepler mission which have multiple transiting small (super-Earth sized) planets: the previously reported Kepler-50 and a new system, Kepler-65, whose planets we validate in this paper. Both stars show rich spectra of solar-like oscillations. From the asteroseismic analysis we find that each host has its rotation axis nearly perpendicular to the line of sight with the sines of the angles constrained at the 1σ level to lie above 0.97 and 0.91, respectively. We use statistical arguments to show that coplanar orbits are favored in both systems, and that the orientations of the planetary orbits and the stellar rotation axis are correlated.",

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AU - Sanchis-Ojeda, R.

AU - Campante, T. L.

AU - Handberg, R.

AU - Stello, D.

AU - Winn, J. N.

AU - Basu, S.

AU - Christensen-Dalsgaard, Jørgen

AU - Davies, G. R.

AU - Metcalfe, T. S.

AU - Buchhave, Lars A.

AU - Fischer, D. A.

AU - Bedding, T. R.

AU - Cochran, W. D.

AU - Elsworth, Y.

AU - Gilliland, R. L.

AU - Hekker, S.

AU - Huber, D.

AU - Isaacson, H.

AU - Karoff, Christoffer

AU - Kawaler, S. D.

AU - Kjeldsen, H.

AU - Latham, D. W.

AU - Lund, M. N.

AU - Lundkvist, M.

AU - Marcy, G. W.

AU - Miglio, A.

AU - Barclay, T.

AU - Lissauer, J. J.

PY - 2013/4/1

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N2 - Results on the obliquity of exoplanet host stars - the angle between the stellar spin axis and the planetary orbital axis - provide important diagnostic information for theories describing planetary formation. Here we present the first application of asteroseismology to the problem of stellar obliquity determination in systems with transiting planets and Sun-like host stars. We consider two systems observed by the NASA Kepler mission which have multiple transiting small (super-Earth sized) planets: the previously reported Kepler-50 and a new system, Kepler-65, whose planets we validate in this paper. Both stars show rich spectra of solar-like oscillations. From the asteroseismic analysis we find that each host has its rotation axis nearly perpendicular to the line of sight with the sines of the angles constrained at the 1σ level to lie above 0.97 and 0.91, respectively. We use statistical arguments to show that coplanar orbits are favored in both systems, and that the orientations of the planetary orbits and the stellar rotation axis are correlated.

AB - Results on the obliquity of exoplanet host stars - the angle between the stellar spin axis and the planetary orbital axis - provide important diagnostic information for theories describing planetary formation. Here we present the first application of asteroseismology to the problem of stellar obliquity determination in systems with transiting planets and Sun-like host stars. We consider two systems observed by the NASA Kepler mission which have multiple transiting small (super-Earth sized) planets: the previously reported Kepler-50 and a new system, Kepler-65, whose planets we validate in this paper. Both stars show rich spectra of solar-like oscillations. From the asteroseismic analysis we find that each host has its rotation axis nearly perpendicular to the line of sight with the sines of the angles constrained at the 1σ level to lie above 0.97 and 0.91, respectively. We use statistical arguments to show that coplanar orbits are favored in both systems, and that the orientations of the planetary orbits and the stellar rotation axis are correlated.

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Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65

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