[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)
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Absil, O., di Folco, E., Mérand, A., et al. 2006, A&A, 452, 237
Absil, O., Defrère, D., Coudé du Foresto, V., et al. 2013, A&A, 555, A104
Backman, D. E., & Paresce, F. 1993, in Protostars and Planets III, eds. E. H. Levy, & J. I. Lunine, 1253
Bonsor, A., Augereau, J.-C., & Thébault, P. 2012, A&A, 548, A104
Bonsor, A., Raymond, S. N., & Augereau, J.-C. 2013, MNRAS, 433, 2938
Bonsor, A., Raymond, S. N., Augereau, J.-C., & Ormel, C. W. 2014, MNRAS, 441, 2380
Defrère, D., Absil, O., Augereau, J.-C., et al. 2011, A&A, 534, A5
Defrère, D., Lebreton, J., Le Bouquin, J.-B., et al. 2012, A&A, 546, L9
di Folco, E., Absil, O., Augereau, J.-C., et al. 2007, A&A, 475, 243
Ertel, S., Absil, O., Defrère, D., et al. 2014, A&A, 570, A128
Le Bouquin, J.-B., Berger, J.-P., Lazare, B., et al. 2011, A&A, 535, A67
Le Bouquin, J.-B., Berger, J.-P., Zins, G., et al. 2012, in Proc SPIE, 8445
Lebreton, J., van Lieshout, R., Augereau, J.-C., et al. 2013, A&A, 555, A146
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.