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A Smaller Radius for the Transiting Exoplanet WASP-10b

Johnson, John Asher and Winn, Joshua N. and Cabrera, Nicole E. and Carter, Joshua A. (2009) A Smaller Radius for the Transiting Exoplanet WASP-10b. Astrophysical Journal Letters, 692 (2). L100-L104. ISSN 2041-8205.

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We present the photometry of WASP-10 during a transit of its short-period Jovian planet. We employed the novel point-spread function shaping capabilities of the Orthogonal Parallel Transfer Imaging Camera mounted on the UH 2.2 m telescope to achieve a photometric precision of 4.7 × 10^(–4) per 1.3 minute sample. With this new light curve, in conjunction with stellar evolutionary models, we improve on existing measurements of the planetary, stellar, and orbital parameters. We find a stellar radius R^* = 0.698 ± 0.012 R_☉ and a planetary radius R_P = 1.080 ± 0.020 R_Jup. The quoted errors do not include any possible systematic errors in the stellar evolutionary models. Our measurement improves the precision of the planet's radius by a factor of 4, and revises the previous estimate downward by 16% (2.5σ, where σ is the quadrature sum of the respective confidence limits). Our measured radius of WASP-10b is consistent with previously published theoretical radii for irradiated Jovian planets.

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Winn, Joshua N.0000-0002-4265-047X
Additional Information:© 2009 American Astronomical Society. Received 2008 October 22; accepted 2009 January 12; published 2009 February 3. We gratefully acknowledge the assistance of the UH 2.2 m telescope staff, including Edwin Sousa, Jon Archambeau, Dan Birchall, John Dvorak, and Hubert Yamada.We are particularly grateful to John Tonry for his clear and comprehensive instrument documentation, and for making his previous OPTIC data available to us in preparation for our observing run. J.A.J. is an NSF Astronomy and Astrophysics Postdoctoral Fellow with support from the NSF grant AST-0702821. N.E.C.’s research was supported by the University of Hawaii Institute for Astronomy Research Experiences for Undergraduates (REU) Program, which is funded by the National Science Foundation through the grant AST-0757887. The authors wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the observations presented herein would not have been possible. Based on observations obtained with the University of Hawaii 2.2 m telescope operated by the Institute for Astronomy.
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University of Hawaii Institute for Astronomy Research Experiences for Undergraduates (REU) ProgramUNSPECIFIED
Subject Keywords:instrumentation: detectors; planetary systems; stars: individual (WASP-10); techniques: photometric
Record Number:CaltechAUTHORS:20130123-134806903
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Official Citation:A Smaller Radius for the Transiting Exoplanet WASP-10b John Asher Johnson et al. 2009 ApJ 692 L100
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36544
Deposited By: Jason Perez
Deposited On:23 Jan 2013 23:25
Last Modified:18 Aug 2017 23:45

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