RELATIVE PHOTOMETRY OF HAT-P-1b OCCULTATIONS
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Winn_Relative photometry.pdf
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Author(s)
Holman, Matthew J.
Gilliland, Ronald L.
Noyes, Robert W.
Sasselov, Dimitar D.
Winn, Joshua Nathan
Beky, B.
Bakos, Gaspar A.
Date Issued
May 2013
Journal
The Astronomical Journal
Publisher
IOP Publishing
Citation
Beky, Bence, Matthew J. Holman, Ronald L. Gilliland, Gaspar A. Bakos, Joshua N. Winn, Robert W. Noyes, and Dimitar D. Sasselov. “RELATIVE PHOTOMETRY OF HAT-P-1b OCCULTATIONS.” The Astronomical Journal 145, no. 6 (May 13, 2013): 166.
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Author's final manuscript
Abstract
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of two occultations of the transiting exoplanet HAT-P-1b. By measuring the planet to star flux ratio near opposition, we constrain the geometric albedo of the planet, which is strongly linked to its atmospheric temperature gradient. An advantage of HAT-P-1 as a target is its binary companion ADS 16402 A, which provides an excellent photometric reference, simplifying the usual steps in removing instrumental artifacts from HST time-series photometry. We find that without this reference star, we would need to detrend the lightcurve with the time of the exposures as well as the first three powers of HST orbital phase, and this would introduce a strong bias in the results for the albedo. However, with this reference star, we only need to detrend the data with the time of the exposures to achieve the same per-point scatter, therefore we can avoid most of the bias associated with detrending. Our final result is a 2σ upper limit of 0.64 for the geometric albedo of HAT-P-1b between 577 and 947 nm.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-6256/145/6/166
