Spin-orbit misalignment in the HD 80606 planetary system

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Spin-orbit misalignment in the HD 80606 planetary system

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dc.contributor.author Pont, F. en_GB
dc.contributor.author Hébrard, G. en_GB
dc.contributor.author Irwin, J. M. en_GB
dc.contributor.author Bouchy, F. en_GB
dc.contributor.author Moutou, C. en_GB
dc.contributor.author Ehrenreich, D. en_GB
dc.contributor.author Guillot, T. en_GB
dc.contributor.author Aigrain, Suzanne en_GB
dc.contributor.author Bonfils, X. en_GB
dc.contributor.author Berta, Z. en_GB
dc.contributor.author Boisse, I. en_GB
dc.contributor.author Burke, C. en_GB
dc.contributor.author Charbonneau, D. en_GB
dc.contributor.author Delfosse, X. en_GB
dc.contributor.author Desort, M. en_GB
dc.contributor.author Eggenberger, A. en_GB
dc.contributor.author Forveille, T. en_GB
dc.contributor.author Lagrange, A.-M. en_GB
dc.contributor.author Lovis, C. en_GB
dc.contributor.author Nutzman, P. en_GB
dc.contributor.author Pepe, F. en_GB
dc.contributor.author Perrier, C. en_GB
dc.contributor.author Queloz, D. en_GB
dc.contributor.author Santos, N. C. en_GB
dc.contributor.author Ségransan, D. en_GB
dc.contributor.author Udry, S. en_GB
dc.contributor.author Vidal-Madjar, A. en_GB
dc.date.accessioned 2009-12-04T12:38:54Z en_GB
dc.date.accessioned 2011-01-25T11:55:05Z en_US
dc.date.accessioned 2013-03-20T13:26:05Z
dc.date.issued 2009 en_GB
dc.description.abstract We recently reported the photometric and spectroscopic detection of the primary transit of the 111-day-period, eccentric extra-solar planet HD80606b, at Observatoire de Haute-Provence, France. The whole egress of the primary transit and a section of its central part were observed, allowing the measurement of the planetary radius, and evidence for a spin-orbit misalignment through the observation of the Rossiter-McLaughlin anomaly. The ingress not having been observed for this long-duration transit, uncertainties remained in the parameters of the system. We present here a refined, combined analysis of our photometric and spectroscopic data, together with further published radial velocities, ground-based photometry, and Spitzer photometry around the secondary eclipse, as well as new photometric measurements of HD80606 acquired at Mount Hopkins, Arizona, just before the beginning of the primary transit. Although the transit is not detected in those new data, they provide an upper limit for the transit duration, which narrows down the possible behaviour of the Rossiter-McLaughlin anomaly in the unobserved part of the transit. We analyse the whole data with a Bayesian approach using a Markov-chain Monte Carlo integration on all available information. We find Rp = 0.98 ± 0.03 RJup for the planetary radius, and a total primary transit duration of 11.9±1.3 h from first to fourth contact. Our analysis reinforces the hypothesis of spin-orbit misalignment in this system (alignment excluded at >95% level), with a positive projected angle between the planetary orbital axis and the stellar rotation (median solution λ ∼ 50◦). As HD80606 is a component of a binary system, the peculiar orbit of its planet could result from a Kozai mechanism. en_GB
dc.identifier.citation 502 (2), pp. 695-703 en_GB
dc.identifier.doi 10.1051/0004-6361/200912463 en_GB
dc.identifier.uri http://hdl.handle.net/10036/87370 en_GB
dc.language.iso en en_GB
dc.publisher EDP Sciences en_GB
dc.relation.url http://dx.doi.org/10.1051/0004-6361/200912463 en_GB
dc.subject planetary systems en_GB
dc.title Spin-orbit misalignment in the HD 80606 planetary system en_GB
dc.type Article en_GB
dc.date.available 2009-12-04T12:38:54Z en_GB
dc.date.available 2011-01-25T11:55:05Z en_US
dc.date.available 2013-03-20T13:26:05Z
dc.identifier.issn 0004-6361 en_GB
dc.identifier.issn 1432-0746 en_GB
dc.description Copyright © The European Southern Observatory (ESO) en_GB
dc.identifier.journal Astronomy and Astrophysics en_GB


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