Ground-based multisite observations of two transits of HD 80606b

A. Shporer , J. N. Winn , S. Dreizler , K. D. Colon , W. M. Wood-Vasey , P. I. Choi , C. Morley , C. Moutou

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W. F. Welsh D. Pollaco D. Starkey E. Adams S. C. C. Barros F. Bouchy A. Cabrera-Lavers S. Cerutti L. Coban K. Costello H. Deeg R. F. Diaz G. A. Esquerdo J. Fernandez S. W. Fleming E. B. Ford B. J. Fulton M. Good G. Hebrard M. J. Holman M. Hunt S. Kadakia G. Lander M. Lockhart T. Mazeh R. C. Morehead B. E. Nelson L. Nortmann F. Reyes E. Roebuck A. R. Rudy R. Ruth E. Simpson C. Vincent G. Weaver J.-W. Xie

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keywords timeeventdifferentground-basedjanuarymidtransitobservationsobserved

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We present ground-based optical observations of the September 2009 and January 2010 transits of HD 80606b. Based on 3 partial light curves of the September 2009 event, we derive a midtransit time of T_c [HJD] = 2455099.196 +- 0.026, which is about 1 sigma away from the previously predicted time. We observed the January 2010 event from 9 different locations, with most phases of the transit being observed by at least 3 different teams. We determine a midtransit time of T_c [HJD] = 2455210.6502 +- 0.0064, which is within 1.3 sigma of the time derived from a Spitzer observation of the same event.

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Ground-based multisite observations of two transits of HD 80606b

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