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Journal articles

High angular resolution detection of β Pictoris b at 2.18 μm

Abstract : Context. A giant planet was recently discovered around the young star β Pictoris. 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 β Pictoris and its disk.
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
Methods: Angular differential Ks-band images of β Pictoris were recorded with NaCo in March and April 2010.
Results: The companion is detected at Ks. This independently confirms the physical nature of β Pictoris b 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.

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https://hal-insu.archives-ouvertes.fr/insu-03612375
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M. Bonnefoy, A. -M. Lagrange, A. Boccaletti, G. Chauvin, D. Apai, et al.. High angular resolution detection of β Pictoris b at 2.18 μm. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 528, ⟨10.1051/0004-6361/201016224⟩. ⟨insu-03612375⟩

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