KEPLER-21b: a 1.6 REarth planet transiting the bright oscillating F subgiant star HD179070

Howell, Steve B. and Rowe, Jason F. and Bryson, Stephen T. and Quinn, Samuel N. and Marcy, Geoffrey W. and Isaacson, Howard and Ciardi, David R. and Chaplin, William J. and Metcalfe, Travis S. and Monteiro, Mario J. P. F. G. and Appourchaux, Thierry and Basu, Sarbani and Creevey, Orlagh L. and Gilliland, Ronald L. and Quirion, Pierre Olivier and Stello, Denis and Kjeldsen, Hans and Christensen-Dalsgaard, Jorgen and Elsworth, Yvonne and Garcia, Rafael A. and Houdek, Gunter and Karoff, Christoffer and Molenda-Akowicz, Joanna and Thompson, Michael J. and Verner, Graham A. and Torres, Guillermo and Fressin, Francois and Crepp, Justin R. and Adams, Elisabeth and Dupree, Andrea and Sasselov, Dimitar D. and Dressing, Courtney D. and Borucki, William J. and Koch, David G. and Lissauer, Jack J. and Latham, David W. and Buchhave, Lars A. and Gautier, Thomas N. and Everett, Mark and Horch, Elliott and Batalha, Natalie M. and Dunham, Edward W. and Szkody, Paula and Silva, David R. and Mighell, Ken and Holberg, Jay and Ballot, Jerome and Bedding, Timothy R. and Bruntt, Hans and Campante, Tiago L. and Handberg, Rasmus and Hekker, Saskia and Huber, Daniel and Mathur, Savita and Mosser, Benoit and Regulo, Clara and White, Timothy R. and Christiansen, Jessie L. and Middour, Christopher K. and Haas, Michael R. and Hall, Jennifer R. and Jenkins, Jon M. and McCauliff, Sean and Fanelli, Michael N. and Kulesa, Craig and McCarthy, Don and Henze, Christopher E. and UNSPECIFIED (2012) KEPLER-21b: a 1.6 REarth planet transiting the bright oscillating F subgiant star HD179070. The Astrophysical Journal, 746 (2). pp. 123-140. ISSN 0004-637X

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Abstract

We present Kepler observations of the bright (V = 8.3), oscillating star HD179070. The observations show transit-like events which reveal that the star is orbited every 2.8days by a small, 1.6 R Earth object. Seismic studies of HD179070 using short cadence Kepler observations show that HD179070 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 HD179070, 1.34 ± 0.06 M ⊙ and 1.86 ± 0.04 R ⊙, respectively, as well as yielding an age of 2.84 ± 0.34Gyr 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 ± 0.000032day 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). HD179070 is the brightest exoplanet host star yet discovered by Kepler.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 13 Jun 2017 04:40
Last Modified: 27 Jun 2017 05:05
Uncontrolled Keywords: planetary systems; stars: activity; stars HD 179070; KIC 3632418; stars interiors; late-type stars; magnetic field; oscillations pulsations; photometric
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/746/2/123
URI: http://eprints.usq.edu.au/id/eprint/32206

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