Dust disks around star in young clusters

DOI

We derived the intermediate-mass (=~1.5-7M_{sun}_) disc fraction (IMDF) in the near-infrared JHK photometric bands as well as in the mid-infrared (MIR) bands for young clusters in the age range of 0 to ~10Myr. From the JHK IMDF, the lifetime of the innermost dust disc (~0.3au; hereafter the K disc) is estimated to be ~3Myr, suggesting a stellar mass (M) dependence of K-disc lifetime (=~1.5-7M_{sun}_). However, from the MIR IMDF, the lifetime of the inner disc (~5au; hereafter the MIR disc) is estimated to be ~6.5Myr, suggesting a very weak stellar mass dependence (M). The much shorter K-disc lifetime compared to the MIR-disc lifetime for intermediate-mass (IM) stars suggests that IM stars with transition discs, which have only MIR excess emission but no K-band excess emission, are more common than classical Herbig Ae/Be stars, which exhibit both. We suggest that this prominent early disappearance of the K disc for IM stars is due to dust settling/growth in the protoplanetary disc, and it could be one of the major reasons for the paucity of close-in planets around IM stars.

Cone search capability for table J/MNRAS/442/2543/appen (List of intermediate-mass stars in target clusters)

Identifier
DOI http://doi.org/10.26093/cds/vizier.74422543
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/442/2543
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/442/2543
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/442/2543
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/442/2543
Provenance
Creator Yasui C.; Kobayashi N.; Tokunaga A.T.; Saito M.
Publisher CDS
Publication Year 2015
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy