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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606241.0, MPI für Astronomie / Publikationen_mpia
High angular resolution detection of b Pictoris b at 2.18 mm
Authors:Bonnefoy, M.; Lagrange, A. M.; Boccaletti, A.; Chauvin, G.; Apai, D.; Allard, F.; Ehrenreich, D.; Girard, J. H. V.; Mouillet, D.; Rouan, D.; Gratadour, D.; Kasper, M.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Astronomy and Astrophysics
Audience:Not Specified
Abstract / Description:Context. A giant planet was recently discovered around the young star <ASTROBJ>β Pictoris</ASTROBJ>. This planet is the closest to its parent star ever imaged. With an estimated mass of about 9 MJup and separation of 8-15 AU, it explains most of the peculiarities of <ASTROBJ>β Pictoris</ASTROBJ> and its disk. <BR /> Aims: Previous detections were made in the L' band (3.8 μm) and at 4.05 μm. We recorded new Ks-band data (2.18 μm) in order to measure its color and get an additional estimate of its mass and effective temperature <BR /> Methods: Angular differential Ks-band images of <ASTROBJ>β Pictoris </ASTROBJ> were recorded with NaCo in March and April 2010. <BR /> Results: The companion is detected at Ks. This independently confirms the physical nature of <ASTROBJ>β Pictoris b</ASTROBJ> inferred from the L' and NB_4.05 bands. The increase of the projected separation between October-December 2009 and April 2010 observations is consistent within error bars with the expected orbital motion. Using the absolute Ks photometry, "hot start" evolutionary models predict a mass of 7-11 MJup in agreement with previous estimates. Moreover, this mass is compatible with Teff = 1700 ± 300 K derived from the comparison of the Ks - L' color with those generated using synthetic spectra. Based on observations collected at the European Southern Observatory, Chile, ESO. Program ID: 284.C-5057.
Free Keywords:instrumentation: adaptive optics; stars: early-type; planetary systems; stars: individual β Pictoris
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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