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Using Stellar Limb-Darkening to Refine the Properties of HD 209458b

Knutson, Heather A. and Charbonneau, David and Noyes, Robert W. and Brown, Timothy M. and Gilliland, Ronald L. (2007) Using Stellar Limb-Darkening to Refine the Properties of HD 209458b. Astrophysical Journal, 655 (1). pp. 564-575. ISSN 0004-637X.

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We use multiband photometry to refine estimates for the planetary radius and orbital inclination of the transiting planet system HD 209458. We gathered 1066 spectra over four distinct transits with the STIS spectrometer on the Hubble Space Telescope using two gratings with a resolution R = 1500 and a combined wavelength range of 290-1030 nm. We divide the spectra into 10 spectrophotometric bandpasses, five for each grating, of equal wavelength span within each grating, and fit a transit curve over all bandpasses simultaneously. In our fit we use theoretical values for the stellar limb-darkening to further constrain the planetary radius. We find that the radius of HD 209458b is (1.320 ± 0.025)R_(Jup), which is a factor of 2 more precise than current estimates. We also obtain improved estimates for the orbital period P and time of center of transit T_C. Although in principle the photon-limited precision of the STIS data should allow us to measure the timing of individual transits to a precision of 2-7 s, we find that uncertainties in the stellar limb-darkening coefficients and residual noise in the data degrade these measurements to a typical precision of ±14 s. Within this level of error, we find no significant variations in the timing of the eight events examined in this work.

Item Type:Article
Related URLs:
URLURL TypeDescription
Knutson, Heather A.0000-0002-0822-3095
Gilliland, Ronald L.0000-0002-1554-5578
Additional Information:© 2007 American Astronomical Society. Received 2006 March 20; accepted 2006 October 5. We are grateful to R. Kurucz for his assistance in calculating the limb-darkening for HD 209458. Support for program number HST-GO-09447 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by AURA under NASA contract NAS5-26555. H. K. was supported by a National Science Foundation Graduate Research Fellowship.
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:binaries: eclipsing; planetary systems; stars: individual (HD 209458); techniques: photometric
Issue or Number:1
Record Number:CaltechAUTHORS:20130220-143513269
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Official Citation:Using Stellar Limb-Darkening to Refine the Properties of HD 209458b Heather A. Knutson et al. 2007 ApJ 655 564
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37030
Deposited By: Ruth Sustaita
Deposited On:20 Feb 2013 22:52
Last Modified:03 Oct 2019 04:43

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