Advanced Search
DSpace@MIT

HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY

Research and Teaching Output of the MIT Community

Show simple item record

dc.contributor.author Winn, Joshua Nathan
dc.contributor.author Johnson, John Asher
dc.contributor.author Albrecht, Simon H.
dc.contributor.author Howard, Andrew W.
dc.contributor.author Marcy, Geoffrey W.
dc.contributor.author Crossfield, Ian J.
dc.contributor.author Holman, Matthew J.
dc.date.accessioned 2010-03-03T15:55:38Z
dc.date.available 2010-03-03T15:55:38Z
dc.date.issued 2009-10
dc.date.submitted 2009-08
dc.identifier.issn 2041-8213
dc.identifier.issn 2041-8205
dc.identifier.uri http://hdl.handle.net/1721.1/52004
dc.description.abstract We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86° with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unparalleled orbit and the third body is based on precise observations of the star's apparent radial velocity (RV). The anomalous RV due to rotation (the Rossiter-McLaughlin effect) was found to be a blueshift during the first half of the transit and a redshift during the second half, an inversion of the usual pattern, implying that the angle between the sky-projected orbital and stellar angular momentum vectors is 182fdg5 ± 9fdg4. The third body is implicated by excess RV variation of the host star over 2 yr. Some possible explanations for the tilted orbit of HAT-P-7b are a close encounter with another planet, the Kozai effect, and resonant capture by an inward-migrating outer planet. en
dc.language.iso en_US
dc.publisher American Astronomical Society en
dc.relation.isversionof http://dx.doi.org/10.1088/0004-637x/703/2/l99 en
dc.rights Attribution-Noncommercial-Share Alike 3.0 Unported en
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/ en
dc.source Josh Winn en
dc.title HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY en
dc.type Article en
dc.identifier.citation HAT-P-7: A Retrograde or Polar Orbit, and a Third Body Joshua N. Winn, John Asher Johnson, Simon Albrecht, Andrew W. Howard, Geoffrey W. Marcy, Ian J. Crossfield, and Matthew J. Holman 2009 ApJ 703 L99-L103 doi: 10.1088/0004-637X/703/2/L99 en
dc.contributor.department Massachusetts Institute of Technology. Department of Physics en_US
dc.contributor.department Kavli Institute for Astrophysics and Space Research en_US
dc.contributor.approver Winn, Joshua Nathan
dc.contributor.mitauthor Winn, Joshua Nathan
dc.contributor.mitauthor Albrecht, Simon H.
dc.relation.journal Astrophysical Journal. Letters en
dc.identifier.mitlicense OPEN_ACCESS_POLICY en
dc.eprint.version Author's final manuscript
dc.type.uri http://purl.org/eprint/type/SubmittedJournalArticle en
eprint.status http://purl.org/eprint/status/PeerReviewed en
dspace.orderedauthors Winn, Joshua N.; Johnson, John Asher; Albrecht, Simon; Howard, Andrew W.; Marcy, Geoffrey W.; Crossfield, Ian J.; Holman, Matthew J. en


Files in this item

Name Size Format
Downloadable Full Text - PDF

This item appears in the following Collection(s)

Show simple item record

Attribution-Noncommercial-Share Alike 3.0 Unported Except where otherwise noted, this item's license is described as Attribution-Noncommercial-Share Alike 3.0 Unported
Open Access