Article (Scientific journals)
A near-infrared interferometric survey of debris-disc stars. V. PIONIER search for variability
Ertel, S.; Defrere, Denis; Absil, Olivier et al.
2016In Astronomy and Astrophysics, 595, p. 44
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Keywords :
Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] Context. Extended circumstellar emission has been detected within a few 100 milli-arcsec around ≳10% of nearby main sequence stars using near-infrared interferometry. Follow-up observations using other techniques, should they yield similar results or non-detections, can provide strong constraints on the origin of the emission. They can also reveal the variability of the phenomenon. Aims: We aim to demonstrate the persistence of the phenomenon over the timescale of a few years and to search for variability of our previously detected excesses. Methods: Using Very Large Telescope Interferometer (VLTI)/Precision Integrated Optics Near Infrared ExpeRiment (PIONIER) in H band we have carried out multi-epoch observations of the stars for which a near-infrared excess was previously detected using the same observation technique and instrument. The detection rates and distribution of the excesses from our original survey and the follow-up observations are compared statistically. A search for variability of the excesses in our time series is carried out based on the level of the broadband excesses. Results: In 12 of 16 follow-up observations, an excess is re-detected with a significance of > 2σ, and in 7 of 16 follow-up observations significant excess (> 3σ) is re-detected. We statistically demonstrate with very high confidence that the phenomenon persists for the majority of the systems. We also present the first detection of potential variability in two sources. Conclusions: We conclude that the phenomenon responsible for the excesses persists over the timescale of a few years for the majority of the systems. However, we also find that variability intrinsic to a target can cause it to have no significant excess at the time of a specific observation.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ertel, S.
Defrere, Denis ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Le Bouquin, J.-B.
Augereau, J.-C.
Berger, J.-P.
Blind, N.
Bonsor, A.
Lagrange, A.-M.
Lebreton, J.
Marion, Lindsay ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Milli, J.
Olofsson, J.
More authors (3 more) Less
Language :
English
Title :
A near-infrared interferometric survey of debris-disc stars. V. PIONIER search for variability
Publication date :
26 October 2016
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
595
Pages :
A44
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 November 2016

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