Article (Scientific journals)
Very deep images of the innermost regions of the beta Pictoris debris disc at L'
Milli, J.; Lagrange, A.-M.; Mawet, D. et al.
2014In Astronomy and Astrophysics, 566, p. 91
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Keywords :
techniques: high angular resolution; planets and satellites: individual: beta Pictoris b; stars: individual: beta Pictoris; planetary systems
Abstract :
[en] Context. Very few debris discs have been imaged in scattered light at wavelengths beyond 3 mum because the thermal emission from both the sky and the telescope is generally too strong with respect to the faint emission of a debris disc. We present here the first analysis of a high angular resolution image of the disc of beta Pictoris at 3.8 mum. <BR /> Aims: Our primary objective is to probe the innermost parts of the beta Pictoris debris disc and describe its morphology. We performed extensive forward modelling to correct for the biases induced by angular differential imaging on extended objects and derive the physical parameters of the disc. <BR /> Methods: This work relies on a new analysis of seven archival data sets of beta Pictoris observed with the NaCo instrument at the Very Large Telescope in the L' band, including observations made with the Annular Groove Phase Mask vortex coronagraph in 2013. The data analysis consists of angular differential imaging associated with disc forward modelling to correct for the biases induced by that technique. The disc model is subtracted from the data and the reduction performed again in order to minimize the residuals in the final image. <BR /> Results: The disc is detected above a 5sigma level between 0.4'' and 3.8''. The two extensions have a similar brightness within error bars. We confirm an asymmetry previously observed at larger distances from the star and at shorter wavelengths: the isophotes are more widely spaced
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Milli, J.
Lagrange, A.-M.
Mawet, D.
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Augereau, J.-C.
Mouillet, D.
Boccaletti, A.
Girard, J. H.
Chauvin, G.
Language :
English
Title :
Very deep images of the innermost regions of the beta Pictoris debris disc at L'
Publication date :
01 June 2014
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
566
Pages :
A91
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Name of the research project :
VORTEX
Funders :
CE - Commission Européenne [BE]
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since 21 October 2014

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