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AuthorsS.B. Howell, J.F. Rowe, S.T. Bryson, S.N. Quinn, G.W. Marcy, H. Isaacson, D. Ciardi, W.J. Chaplin, T.S. Metcalfe, M.J.P.F.G. Monteiro, T. Appourchaux, S. Basu, O.L. Creevey, R.L. Gilliland, P.-O. Quirion, D. Stello, H. Kjeldsen, J. Christensen-Dalsgaard, Y. Elsworth, R.A. Garcia, G. Houdek, C. Karoff, J. Molenda-Żakowicz, M.J. Thompson, G.A. Verner, G. Torres, F. Fressin, J.R. Crepp, C. Adams, A. Dupree, D.D/ Sasselov, C.D. Dressing, W.J. Borucki, D.G. Koch, J.J. Lissauer, D.W. Latham, L.A. Buchhave, T.N. Gautier, M. Everett, E. Horch, N.M. Batalha, E.W. Dunham, P. Szkody, D.R. Silva, K. Mighell, J. Holberg, J. Ballot, T.R. Bedding, H. Bruntt, T.L. Campante, R. Handberg, S. Hekker, D. Huber, S. Mathur, B. Mosser, C. Régulo, T.R. White, J.L. Christiansen, C.K. Middour, M.R. Haas, J.R. Hall, J.M. Jenkins, S. McCaulif, M.N. Fanelli, C. Kulesa, D. McCarthy, C.E. Henze
TitleKepler-21b: A 1.6 R Earth Planet Transiting the Bright Oscillating F Subgiant Star HD 179070
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractWe present Kepler observations of the bright (V = 8.3), oscillating star HD 179070. The observations show transit-like events which reveal that the star is orbited every 2.8 days by a small, 1.6 R Earth object. Seismic studies of HD 179070 using short cadence Kepler observations show that HD 179070 has a frequency-power spectrum consistent with solar-like oscillations that are acoustic p-modes. Asteroseismic analysis provides robust values for the mass and radius of HD 179070, 1.34 ± 0.06 M ☉ and 1.86 ± 0.04 R ☉, respectively, as well as yielding an age of 2.84 ± 0.34 Gyr for this F5 subgiant. Together with ground-based follow-up observations, analysis of the Kepler light curves and image data, and blend scenario models, we conservatively show at the >99.7% confidence level (3σ) that the transit event is caused by a 1.64 ± 0.04 R Earth exoplanet in a 2.785755 ± 0.000032 day orbit. The exoplanet is only 0.04 AU away from the star and our spectroscopic observations provide an upper limit to its mass of ~10 M Earth (2σ). HD 179070 is the brightest exoplanet host star yet discovered by Kepler.
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