A Transmission Spectrum Of HD 189733b From Multiple Broadband Filter Observations
Abstract
We present new multi-broadband transit photometry of HD 189733b obtained at the Wyoming Infrared Observatory. Using an ensemble of five-band Sloan filter observations across multiple transits we have created an "ultra-low" resolution transmission spectrum to discern the nature of the exoplanet atmosphere. The observations were taken over three transit events and total 108 u', 120 g', 120 r', 110 i', and 116 z' images with an average exposure cadence of seven minutes for an entire series. The analysis was performed with a Markov-Chain Monte-Carlo method assisted by a Gaussian processes regression model. We find the apparent planet radius to increase from 0.154 +0.000920-0.00096 R* at z'-band to 0.157 +0.00074-0.00078 R* at u'-band. Whether this apparent radius implies an enhanced Rayleigh scattering or clear or grey planet atmosphere is highly dependent on stellar spot modeling assumptions, but our results are consistent with the literature for HD 189733b. This set of observations demonstrates the ability of our 2.3-m ground-based observatory to measure atmospheres of large exoplanets.
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Cite
@article{arxiv.1812.03242,
title = {A Transmission Spectrum Of HD 189733b From Multiple Broadband Filter Observations},
author = {David H. Kasper and Jackson L. Cole and Cristilyn N. Gardner and Bethany R. Garver and Kyla L. Jarka and Aman Kar and Aylin M. McGough and David J. PeQueen and Daniel Ivan Rivera and Hannah Jang-Condell and Henry A. Kobulnicky and Adam D. Myers and Daniel A. Dale},
journal= {arXiv preprint arXiv:1812.03242},
year = {2018}
}
Comments
14 Pages, 5 Figures, 6 Tables