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VLTI/GRAVITY observations of the young star beta Pictoris
Defrere, Denis
2018In Proceedings of the SF2A symposium
 

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Keywords :
beta Pictoris; exozodiacal dust; VLTI
Abstract :
[en] The nearby young star beta Pictoris is surrounded by the archetypal debris disc, which provides a unique window on the formation and early evolution of terrestrial planets. While the outer disc has been extensively studied since its discovery in 1984, very little is currently known about the inner planetary system (<4AU). Recently, accurate squared visibilities obtained with VLTI/PIONIER revealed the presence of resolved circumstellar emission with an integrated brightness amounting to approximately 1.4% of the stellar brightness in H band. However, it is not clear whether this excess emission originates from thermal emission, reflected light from hot dust grains located in the innermost regions of the planetary system, or is simply due to forward scattering by dust grains located further away (but still within the PIONIER field-of-view, i.e., close to the line of sight). In this paper, we present medium-resolution K-band observations of beta Pic obtained with VLTI/GRAVITY during science verification. The goals of these observations are to better constrain the temperature of the grains (and hence their location and chemical composition) and to showcase the high-precision capabilities of GRAVITY at detecting faint, close-in circumstellar emission.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Defrere, Denis ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
VLTI/GRAVITY observations of the young star beta Pictoris
Publication date :
15 January 2018
Event name :
SF2A 2017
Event date :
from 04-07-2017 to 07-07-2017
Audience :
International
Main work title :
Proceedings of the SF2A symposium
Pages :
3
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