Le Bouquin, J.-B.
AffiliationUniv Arizona, Dept Astron, Steward Observ
MetadataShow full item record
PublisherEDP SCIENCES S A
CitationA near-infrared interferometric survey of debris-disc stars 2016, 595:A44 Astronomy & Astrophysics
JournalAstronomy & Astrophysics
Rights© ESO, 2016
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractContext. 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 >2 sigma, and in 7 of 16 follow-up observations significant excess (>3 sigma) 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.
NoteOpen Access Journal.
VersionFinal published version
SponsorsFrench National Research Agency (ANR) [ANR-2010 BLAN-0505-01]; PNP-CNES; ALMA/Conicyt ; Universite Joseph Fourier (UJF); Institut de Planetologie et d'Astrophysique de Grenoble (IPAG); Agence Nationale pour la Recherche [ANR-06-BLAN-0421, ANR-10-BLAN-0505]; Institut National des Science de l'Univers (INSU PNP); Institut National des Science de l'Univers (PNPS); CNES RT