A Precise Asteroseismic Age and Radius for the Evolved Sun-like Star KIC 11026764
Travis S. Metcalfe
(1)
,
M. J. P. F. G. Monteiro
(2)
,
Michael J. Thompson
(3)
,
Joanna Molenda-Zakowicz
(4)
,
Thierry Appourchaux
(5)
,
William J. Chaplin
(6)
,
Gülnur Dogan
(7)
,
Patrick Eggenberger
(8)
,
Timothy R. Bedding
(9)
,
H. Bruntt
(10)
,
Orlagh L. Creevey
(11)
,
Pierre-Olivier Quirion
(12)
,
Dennis Stello
(9)
,
Alfio Bonanno
(13)
,
Victor Silva Aguirre
(14)
,
Sarbani Basu
(15)
,
Lisa Esch
(15)
,
Ning Gai
(15)
,
Maria Pia Di Mauro
(16)
,
A. G. Kosovichev
(17)
,
I. N. Kitiashvili
(18)
,
Juan Carlos Suárez
(19)
,
Andrés Moya
(20)
,
Laurent Piau
(21)
,
Rafael A. Garcia
(21)
,
Joao Marques
(22)
,
A. Frasca
(13)
,
Katia Biazzo
(23)
,
S. G. Sousa
(2)
,
Stefan Dreizler
(24)
,
Michaël Bazot
(2)
,
Christoffer Karoff
(6)
,
Søren Frandsen
(7)
,
P. A. Wilson
(25)
,
Timothy M. Brown
(26)
,
Jörgen Christensen-Dalsgaard
(7)
,
Ronald L. Gilliland
(27)
,
Hans Kjeldsen
(7)
,
Tiago L. Campante
(2)
,
Stephen T. Fletcher
(28)
,
Rasmus Handberg
(7)
,
Clara Regulo
(11)
,
David Salabert
(11)
,
Jesper Schou
(17)
,
Graham A. Verner
(29)
,
Jérôme Ballot
(30)
,
A. M. Broomhall
(6)
,
Yvonne P. Elsworth
(6)
,
Saskia Hekker
(6)
,
Daniel Huber
(9)
,
Savita Mathur
(1)
,
R. New
(28)
,
Ian W. Roxburgh
(10, 29)
,
K. H. Sato
(21)
,
Timothy R. White
(9)
,
William J. Borucki
(31)
,
David Koch
(31)
,
Jon M. Jenkins
(32)
1
High Altitude Observatory, National Center for Atmospheric Research
2 Universidade do Porto = University of Porto
3 University of Sheffield [Sheffield]
4 Astronomical Institute, University of Wroclaw
5 IAS - Institut d'astrophysique spatiale
6 School of Physics and Astronomy, University of Birmingham
7 DASC - Danish AsteroSeismology Centre
8 Observatoire Astronomique de l'Université de Genève
9 SIfA - Sydney Institute for Astronomy
10 Observatoire de Paris
11 IAC - Instituto de Astrofisica de Canarias
12 CSA - Canadian Space Agency
13 INAF-OACt - INAF-Osservatorio Astrofisico di Catania
14 MPA - Max-Planck-Institut für Astrophysik
15 Department of Astronomy, Yale University
16 IASF-Roma - Istituto di Astrofisica Spaziale e Fisica Cosmica
17 HEPL, Stanford University, Stanford
18 Center for Turbulence Research, Stanford University
19 IAA - Instituto de Astrofísica de Andalucía
20 Laboratorio de Astrofísica, CAB (CSIC-INTA), Villanueva de la Cañada, Madrid
21 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
22 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
23 OAA - INAF - Osservatorio Astrofisico di Arcetri
24 Georg-August-University = Georg-August-Universität Göttingen
25 Nordic Optical Telescope
26 Las Cumbres Observatory, Goleta
27 STScI - Space Telescope Science Institute
28 Materials Engineering Research Institute, Sheffield Hallam University, Sheffield
29 School of Mathematical Sciences, Queen Mary Unversity of London
30 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
31 National Aeronautics and Space Administration, Ames Research Center
32 SETI Institute, NASA Ames Research Center, Moffett Field
2 Universidade do Porto = University of Porto
3 University of Sheffield [Sheffield]
4 Astronomical Institute, University of Wroclaw
5 IAS - Institut d'astrophysique spatiale
6 School of Physics and Astronomy, University of Birmingham
7 DASC - Danish AsteroSeismology Centre
8 Observatoire Astronomique de l'Université de Genève
9 SIfA - Sydney Institute for Astronomy
10 Observatoire de Paris
11 IAC - Instituto de Astrofisica de Canarias
12 CSA - Canadian Space Agency
13 INAF-OACt - INAF-Osservatorio Astrofisico di Catania
14 MPA - Max-Planck-Institut für Astrophysik
15 Department of Astronomy, Yale University
16 IASF-Roma - Istituto di Astrofisica Spaziale e Fisica Cosmica
17 HEPL, Stanford University, Stanford
18 Center for Turbulence Research, Stanford University
19 IAA - Instituto de Astrofísica de Andalucía
20 Laboratorio de Astrofísica, CAB (CSIC-INTA), Villanueva de la Cañada, Madrid
21 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
22 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
23 OAA - INAF - Osservatorio Astrofisico di Arcetri
24 Georg-August-University = Georg-August-Universität Göttingen
25 Nordic Optical Telescope
26 Las Cumbres Observatory, Goleta
27 STScI - Space Telescope Science Institute
28 Materials Engineering Research Institute, Sheffield Hallam University, Sheffield
29 School of Mathematical Sciences, Queen Mary Unversity of London
30 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
31 National Aeronautics and Space Administration, Ames Research Center
32 SETI Institute, NASA Ames Research Center, Moffett Field
Résumé
The primary science goal of the Kepler Mission is to provide a census of exoplanets in the solar neighborhood, including the identification and characterization of habitable Earth-like planets. The asteroseismic capabilities of the mission are being used to determine precise radii and ages for the target stars from their solar-like oscillations. Chaplin et al. published observations of three bright G-type stars, which were monitored during the first 33.5 days of science operations. One of these stars, the subgiant KIC 11026764, exhibits a characteristic pattern of oscillation frequencies suggesting that it has evolved significantly. We have derived asteroseismic estimates of the properties of KIC 11026764 from Kepler photometry combined with ground-based spectroscopic data. We present the results of detailed modeling for this star, employing a variety of independent codes and analyses that attempt to match the asteroseismic and spectroscopic constraints simultaneously. We determine both the radius and the age of KIC 11026764 with a precision near 1%, and an accuracy near 2% for the radius and 15% for the age. Continued observations of this star promise to reveal additional oscillation frequencies that will further improve the determination of its fundamental properties.