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Properties of the young gas giant planet β Pictoris b

Published online by Cambridge University Press:  06 January 2014

Mickaël Bonnefoy ,
Anthony Boccaletti ,
Anne-Marie Lagrange ,
France Allard ,
Christoph Mordasini ,
Hervé Beust ,
Gaël Chauvin ,
Julien H. V. Girard ,
Derek Homeier  and
Daniel Apai
...Show all authors
Mickaël Bonnefoy
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: bonnefoy@mpia-hd.mpg.de
Anthony Boccaletti
Affiliation:
LESIA, Observatoire de Paris, CNRS, University Pierre et Marie Curie Paris 6 and University Denis Diderot Paris 7, 5 place Jules Janssen, 92195 Meudon, France
Anne-Marie Lagrange
Affiliation:
UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041, France
France Allard
Affiliation:
CRAL, UMR 5574, CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, F-69364 Lyon Cedex 07, France
Christoph Mordasini
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: bonnefoy@mpia-hd.mpg.de
Hervé Beust
Affiliation:
UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041, France
Gaël Chauvin
Affiliation:
UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041, France
Julien H. V. Girard
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile
Derek Homeier
Affiliation:
CRAL, UMR 5574, CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, F-69364 Lyon Cedex 07, France
Daniel Apai
Affiliation:
Department of Astronomy, 933 N. Cherrt Avenue, Tuscon, AZ 85721, USA Department of Planetary Sciences, The University of Arizona, 1929 E. University Blvd., Tuscon, AZ 85721, USA
Sylvestre Lacour
Affiliation:
LESIA, Observatoire de Paris, CNRS, University Pierre et Marie Curie Paris 6 and University Denis Diderot Paris 7, 5 place Jules Janssen, 92195 Meudon, France
Daniel Rouan
Affiliation:
LESIA, Observatoire de Paris, CNRS, University Pierre et Marie Curie Paris 6 and University Denis Diderot Paris 7, 5 place Jules Janssen, 92195 Meudon, France
Julien Rameau
Affiliation:
UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041, France
Hubert Klahr
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: bonnefoy@mpia-hd.mpg.de
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Abstract

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The young (12+8−4 Myr) and nearby (19.44±0.05 pc) star β Pictoris is considered one of the best laboratories for the study of early phases of planetary systems formation since the identification of an extended debris disk surrounding the star in 1984. In 2009, we imaged at 3.8 μm with NaCo at VLT a gas giant planet around β Pictoris, roughly along the disk mid-plane, with a semi-major axis between 8 and 14 AU. We present here the first images of the planet in the J (1.265 μm), H (1.66 μm), and M' (4.78 μm) bands obtained between 2011 and 2012. We used these data to build the 1-5 μm spectral energy distribution (SED) of the companion, and to consolidate previous semi-major axis (8-10 AU) estimates. We compared the SED to seven atmospheric models to derive Teff = 1700 ± 100 K. We used the temperature and the luminosity of β Pictoris b to estimate new masses for the companion. We compared these masses to independent constraints set by the orbital parameters and the radial velocities and use them to discuss the formation history of the object.

Keywords

instrumentation: adaptive opticshigh angular resolutionstars: β PictorisExoplanets: formationevolutionatmosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 241 - 246
Copyright
Copyright © International Astronomical Union 2013 

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