A Determination of the Spin‐Orbit Alignment of the Anomalously Dense Planet Orbiting HD 149026 | Zendy

Aaron S. Wolf | Zendy; Gregory Laughlin | Zendy; Gregory W. Henry | Zendy; Debra A. Fischer | Zendy; Geoff Marcy | Zendy; Paul Butler | Zendy; Steve Vogt | Zendy

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A Determination of the Spin‐Orbit Alignment of the Anomalously Dense Planet Orbiting HD 149026

Author(s) -

Aaron S. Wolf,

Gregory Laughlin,

Gregory W. Henry,

Debra A. Fischer,

Geoff Marcy,

Paul Butler,

Steve Vogt

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/503354

Subject(s) - physics , planet , astrophysics , radial velocity , radius , planetary system , astronomy , orbit (dynamics) , orbital inclination , orbital plane , exoplanet , orbital eccentricity , stars , binary number , computer security , arithmetic , mathematics , computer science , engineering , aerospace engineering

Wereport35radialvelocitymeasurementsof HD149026takenwiththeKeckTelescope.Ofthesemeasurements,15 were made during the transit of the companion planet HD 149026b, which occurred on 2005 June 25. These velocities provide a high-cadence observation of the Rossiter-McLaughlin effect, the shifting of photospheric line profiles that occurswhenaplanetoccultsaportionoftherotatingstellarsurface.Wecombinetheseradialvelocitieswithpreviously publishedradialvelocityandphotometricdatasetsandderiveacompositebest-fitmodelforthestar-planetsystem.This modelconfirmsandimprovespreviouslypublishedorbitalparameters,includingtheremarkablysmallplanetaryradius, the planetary mass, and the orbital inclination, found to be Rp/RJup …0:718 0:065, Mp/MJup …0:352 0:025, and I … 86:1 1:4 , respectively. Together the planetary mass and radius determinations imply a mean planetary density of1:18˛0:38 0:30 gcm 3 .Thenewdataalsoallowforthedeterminationoftheanglebetweentheapparentstellarequatorand

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