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|Title:||Further Constraints on the Optical Transmission Spectrum of HAT-P-1b||Authors:||Montalto, M.
Santos, N. C.
Martins, J. H. C.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||811||Issue:||1||First Page:||55||Abstract:||We report on novel observations of HAT-P-1 aimed at constraining the optical transmission spectrum of the atmosphere of its transiting hot-Jupiter exoplanet. Ground-based differential spectrophotometry was performed over two transit windows using the DOLORES spectrograph at the Telescopio Nazionale Galileo. Our measurements imply an average planet to star radius ratio equal to R<SUB>p</SUB>/R<SUB>*</SUB> = (0.1159 ± 0.0005). This result is consistent with the value obtained from recent near-infrared measurements of this object, but differs from previously reported optical measurements, being lower by around 4.4 exoplanet scale heights. Analyzing the data over five different spectral bins of ∼600 Å wide, we observed a single peaked spectrum (3.7 σ level) with a blue cutoff corresponding to the blue edge of the broad absorption wing of sodium and an increased absorption in the region in-between 6180 and 7400 Å. We also infer that the width of the broad absorption wings due to alkali metals is likely narrower than the one implied by solar abundance clear atmospheric models. We interpret the result as evidence that HAT-P-1b has a partially clear atmosphere at optical wavelengths with a more modest contribution from an optical absorber than previously reported.||Acknowledgments:||This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. M.M. acknowledges the support from FCT through the grant SFRH/BDP/71230/2010 and kindly aknowledges Luca Di Fabrizio and the TNG staff for their support during the observations and insightful comments on the technical specifications of the instrumentation. The anonymous referee is also acknowledged for useful comments and suggestions. P.F. and N.C.S. acknowledge support by Fundação para a Ciência e a Tecnologia (FCT) through Investigador FCT contracts of reference IF/01037/2013 and IF/00169/2012, respectively, and POPH/FSE (EC) by FEDER funding through the program “Programa Operacional de Factores de Competitividade—COMPETE.” P.F. further acknowledges support from Fundação para a Ciência e a Tecnologia (FCT) in the form of an exploratory project of reference IF/01037/2013CP1191/CT0001. R.A. acknowledges the Spanish Ministry of Economy and Competitiveness (MINECO) for financial support under the Ramón y Cajal program RYC-2010-06519.||URI:||http://hdl.handle.net/20.500.12386/26325||URL:||https://iopscience.iop.org/article/10.1088/0004-637X/811/1/55||ISSN:||0004-637X||DOI:||10.1088/0004-637X/811/1/55||Bibcode ADS:||2015ApJ...811...55M||Fulltext:||open|
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