Nondetection of Polarized, Scattered Light from the HD 189733b Hot Jupiter
- Creators
- Wiktorowicz, Sloane J.
Abstract
Using the POLISH instrument, I am unable to reproduce the large-amplitude polarimetric observations of Berdyugina et al. to the >99.99% confidence level. I observe no significant polarimetric variability in the HD 189733 system, and the upper limit to variability from the exoplanet is ΔP < 7.9 × 10^(–5) with 99% confidence in the 400-675 nm wavelength range. Berdyugina et al. report polarized, scattered light from the atmosphere of the HD 189733b hot Jupiter with an amplitude of two parts in 10^4. Such a large amplitude is over an order of magnitude larger than expected given a geometric albedo similar to other hot Jupiters. However, my nondetection of polarimetric variability phase-locked to the orbital period of the exoplanet, and the lack of any significant variability, shows that the polarimetric modulation reported by Berdyugina et al. cannot be due to the exoplanet.
Additional Information
© 2009 The American Astronomical Society. Received 2008 October 24; accepted 2009 February 11; published 2009 April 22. I thank Shrinivas Kulkarni and James Graham for their support as well as Bruce Macintosh and Lynne Hillenbrand for suggestions on this manuscript. I also acknowledge funding from the Moore Foundation as well as from the Center for Adaptive Optics. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. Facilities: Hale.Attached Files
Published - Wiktorowicz2009p2576Astrophys_J.pdf
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Additional details
- Eprint ID
- 15630
- Resolver ID
- CaltechAUTHORS:20090904-140655926
- Gordon and Betty Moore Foundation
- Created
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2009-09-15Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field