van Belle, Gerard T. and von Braun, Kaspar (2009) Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars. Astrophysical Journal, 694 (2). pp. 1085-1098. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090917-140118568
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We present interferometric angular sizes for 12 stars with known planetary companions, for comparison with 28 additional main-sequence stars not known to host planets. For all objects we estimate bolometric fluxes and reddenings through spectral-energy distribution (SED) fits, and in conjunction with the angular sizes, measurements of effective temperature. The angular sizes of these stars are sufficiently small that the fundamental resolution limits of our primary instrument, the Palomar Testbed Interferometer, are investigated at the sub-milliarcsecond level and empirically established based upon known performance limits. We demonstrate that the effective temperature scale as a function of dereddened (V − K)_0 color is statistically identical for stars with and without planets. A useful byproduct of this investigation is a direct calibration of the T_(EFF) scale for solarlike stars, as a function of both spectral type and (V − K)_0 color, with an precision of ΔTbar_((V−K)0) = 138 K over the range (V − K)_0 = 0.0–4.0 and ΔTbar_(SpType) = 105 K for the range F6V–G5V. Additionally, in an Appendix we provide SED fits for the 166 stars with known planets which have sufficient photometry available in the literature for such fits; this derived “XO-Rad” database includes homogeneous estimates of bolometric flux, reddening, and angular size.
|Additional Information:||© 2009 The American Astronomical Society. Received 2008 October 15; accepted 2008 December 31; published 2009 March 23. We acknowledge constructive input and the occasional snide comment from David Ciardi. This investigation has made extensive use of the sedFit code, graciously provided by perl guru Andrew F. Boden. The preparation of this manuscript was greatly helped by the use of the Extrasolar Planet Encyclopedia. This research made use of the NASA/IPAC/NExScI Star and Exoplanet Database (NStED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The Palomar Testbed Interferometer is operated by the NASA Exoplanet Science Institute/ Michelson Science Center on and the PTI collaboration and was constructed with funds from the Jet Propulsion Laboratory, Caltech as provided by the National Aeronautics and Space Administration. This work has made use of services produced by the NASA Exoplanet Science Institute at the California Institute of Technology.|
|Subject Keywords:||infrared: stars; stars: fundamental parameters; techniques: interferometric|
|Official Citation:||Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars Gerard T. van Belle and Kaspar von Braun 2009 ApJ 694 1085-1098 doi: 10.1088/0004-637X/694/2/1085.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||22 Sep 2009 17:02|
|Last Modified:||26 Dec 2012 11:24|
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