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A near-infrared interferometric survey of debris-disc stars. V. PIONIER search for variability

Ertel, S. and Defrère, D. and Absil, O. and Le Bouquin, J.-B. and Augereau, J.-C. and Berger, J.-P. and Blind, N. and Bonsor, A. and Lagrange, A.-M. and Lebreton, J. and Marion, L. and Milli, J. and Olofsson, J. (2016) A near-infrared interferometric survey of debris-disc stars. V. PIONIER search for variability. Astronomy and Astrophysics, 595 . Art. No. A44. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20161222-105331932

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201527721DOIArticle
http://www.aanda.org/articles/aa/abs/2016/11/aa27721-15/aa27721-15.htmlPublisherArticle
https://arxiv.org/abs/1608.05731arXivDiscussion Paper
ORCID:
AuthorORCID
Ertel, S.0000-0002-2314-7289
Defrère, D.0000-0003-3499-2506
Absil, O.0000-0002-4006-6237
Berger, J.-P.0000-0001-5025-0428
Lebreton, J.0000-0003-1476-5963
Milli, J.0000-0001-9325-2511
Additional Information:© ESO, 2016. Received 10 November 2015 / Accepted 14 August 2016. This work has significantly benefited from the discussion at the hot dust workshop (JPL/CalTech, May 2015) organized by B. Mennesson and R. Millan-Gabet. S. Ertel, J.-C. Augereau, and A. Bonsor thank the French National Research Agency (ANR, contract ANR-2010 BLAN-0505-01, EXOZODI) and PNP-CNES for financial support. J. Olofsson acknowledges support from the ALMA/Conicyt Project 31130027. PIONIER is funded by the Université Joseph Fourier (UJF), the Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), the Agence Nationale pour la Recherche (ANR-06-BLAN-0421 and ANR-10-BLAN-0505), and the Institut National des Science de l’Univers (INSU PNP and PNPS). The integrated optics beam combiner is the result of a collaboration between IPAG and CEA-LETI based on CNES R&T funding. This research has made use of the Jean-Marie Mariotti Center Aspro1 and SearchCal2 services, the latter co-developped by FIZEAU and LAOG/IPAG, and of the CDS Astronomical Databases SIMBAD and VIZIER3. The authors warmly thank everyone involved in the VLTI project.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-2010 BLAN-0505-01, EXOZODI
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONCIYT)31130027
Université Joseph FourierUNSPECIFIED
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)UNSPECIFIED
Agence Nationale pour la Recherche (ANR)ANR-06-BLAN-0421
Agence Nationale pour la Recherche (ANR)ANR-10-BLAN-0505
Institut National des Science de l’Univers (INSU)UNSPECIFIED
Subject Keywords:techniques: interferometric / circumstellar matter / planetary systems / zodiacal dust
Record Number:CaltechAUTHORS:20161222-105331932
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161222-105331932
Official Citation:A near-infrared interferometric survey of debris-disc stars - V. PIONIER search for variability S. Ertel, D. Defrère, O. Absil, J.-B. Le Bouquin, J.-C. Augereau, J.-P. Berger, N. Blind, A. Bonsor, A.-M. Lagrange, J. Lebreton, L. Marion, J. Milli and J. Olofsson A&A, 595 (2016) A44 DOI: http://dx.doi.org/10.1051/0004-6361/201527721
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73146
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 Dec 2016 19:44
Last Modified:11 Oct 2019 01:42

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