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A near-infrared interferometric survey of debris-disk stars - VII. The hot-to-warm dust connection

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Absil, O., Marion, L., Ertel, S., Defrère, D., Kennedy, Grant M., Romagnolo, A., Le Bouquin, J.-B., Christiaens, V., Milli, J., Bonsor, A., Olofsson, J., Su, K. Y. L. and Augereau, J.-C. (2021) A near-infrared interferometric survey of debris-disk stars - VII. The hot-to-warm dust connection. Astronomy & Astrophysics, 651 . A45. doi:10.1051/0004-6361/202140561

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Official URL: http://dx.doi.org/10.1051/0004-6361/202140561

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Abstract

Context. Hot exozodiacal dust has been shown to be present in the innermost regions of an increasing number of main sequence stars over the past 15 yr. However, the origin of hot exozodiacal dust and its connection with outer dust reservoirs remains unclear.
Aims: We aim to explore the possible connection between hot exozodiacal dust and warm dust reservoirs (≥100 K) in asteroid belts.
Methods: We use precision near-infrared interferometry with VLTI/PIONIER to search for resolved emission at H-band around a selected sample of 62 nearby stars that show possible signs of warm dust populations.
Results: Our observations reveal the presence of resolved near-infrared emission around 17 out of 52 stars with sufficient data quality. For four of these, the emission is shown to be due to a previously unknown stellar companion. The 13 other H-band excesses are thought to originate from the thermal emission of hot dust grains, close to their sublimation temperature. Taking into account earlier PIONIER observations, where some stars with warm dust were also observed, and after re-evaluating the warm dust content of all our PIONIER targets through spectral energy distribution modeling, we find a detection rate of 17.1−4.6+8.1% for H-band excess around main sequence stars hosting warm dust belts, which is statistically compatible with the occurrence rate of 14.6−2.8+4.3% found around stars showing no signs of warm dust. After correcting for the sensitivity loss due to partly unresolved hot disks, under the assumption that they are arranged in a thin ring around their sublimation radius, we find tentative evidence at the 3σ level that H-band excesses around stars with outer dust reservoirs (warm or cold) could be statistically larger than H-band excesses around stars with no detectable outer dust.
Conclusions: Our observations do not suggest a direct connection between warm and hot dust populations at the sensitivity level of the considered instruments, although they bring to light a possible correlation between the level of H-band excess and the presence of outer dust reservoirs in general.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Circumstellar matter , Double stars , Interferometry
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: July 2021
Dates:
DateEvent
July 2021Published
9 July 2021Available
21 April 2021Accepted
Volume: 651
Article Number: A45
DOI: 10.1051/0004-6361/202140561
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: Reproduced with permission from Astronomy & Astrophysics, © ESO.
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ANR-2010 BLAN-0505-01, EXOZODI[ANR] Agence Nationale de la Recherchehttp://dx.doi.org/10.13039/501100001665
FRIA PhD fellowshipFonds De La Recherche Scientifique - FNRShttp://dx.doi.org/10.13039/501100002661
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
NCN19_171Universidad de Valparaísohttp://dx.doi.org/10.13039/501100004427
1180395[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
Open Access Version:
  • https://arxiv.org/pdf/2104.14216.pdf

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