期刊
ASTROPHYSICAL JOURNAL
卷 726, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/726/1/2
关键词
planetary systems; stars: individual (HD 17156); stars: oscillations; techniques: photometric
资金
- NASA [NAS 5-26555]
- STScI [GO/DD-11945]
Observations conducted with the Fine Guidance Sensor on the Hubble Space Telescope (HST) providing high cadence and precision time-series photometry were obtained over 10 consecutive days in 2008 December on the host star of the transiting exoplanet HD 17156b. During this time, 1.0 x 10(12) photons (corrected for detector dead time) were collected in which a noise level of 163 parts per million per 30 s sum resulted, thus providing excellent sensitivity to the detection of the analog of the solar 5-minute p-mode oscillations. For HD 17156, robust detection of p modes supports the determination of the stellar mean density of = 0.5301 +/- 0.0044 g cm(-3) from a detailed fit to the observed frequencies of modes of degree l = 0, 1, and 2. This is the first star for which the direct determination of has been possible using both asteroseismology and detailed analysis of a transiting planet light curve. Using the density constraint from asteroseismology, and stellar evolution modeling results in M-* = 1.285 +/- 0.026 M-circle dot, R-* = 1.507 +/- 0.012 R-circle dot, and a stellar age of 3.2 +/- 0.3 Gyr.
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