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dc.contributor.authorWinn, Joshua Nathan
dc.contributor.authorJohnson, John Asher
dc.contributor.authorAlbrecht, Simon H.
dc.contributor.authorHoward, Andrew W.
dc.contributor.authorMarcy, Geoffrey W.
dc.contributor.authorCrossfield, Ian J.
dc.contributor.authorHolman, Matthew J.
dc.date.accessioned2010-03-03T15:55:38Z
dc.date.available2010-03-03T15:55:38Z
dc.date.issued2009-10
dc.date.submitted2009-08
dc.identifier.issn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/1721.1/52004
dc.description.abstractWe 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.isoen_US
dc.publisherAmerican Astronomical Societyen
dc.relation.isversionofhttp://dx.doi.org/10.1088/0004-637x/703/2/l99en
dc.rightsAttribution-Noncommercial-Share Alike 3.0 Unporteden
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/en
dc.sourceJosh Winnen
dc.titleHAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODYen
dc.typeArticleen
dc.identifier.citationHAT-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/L99en
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Researchen_US
dc.contributor.approverWinn, Joshua Nathan
dc.contributor.mitauthorWinn, Joshua Nathan
dc.contributor.mitauthorAlbrecht, Simon H.
dc.relation.journalAstrophysical Journal. Lettersen
dc.eprint.versionAuthor's final manuscript
dc.type.urihttp://purl.org/eprint/type/SubmittedJournalArticleen
eprint.statushttp://purl.org/eprint/status/PeerRevieweden
dspace.orderedauthorsWinn, Joshua N.; Johnson, John Asher; Albrecht, Simon; Howard, Andrew W.; Marcy, Geoffrey W.; Crossfield, Ian J.; Holman, Matthew J.en
dc.identifier.orcidhttps://orcid.org/0000-0002-4265-047X
mit.licenseOPEN_ACCESS_POLICYen
mit.metadata.statusComplete


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