Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters

Abstract

We investigate the circumstellar disc fraction as determined from L-band excess observations of the young, massive Arches and Quintuplet clusters residing in the central molecular zone of the Milky Way. The Quintuplet cluster was searched for L-band excess sources for the first time. We find a total of 26 excess sources in the Quintuplet cluster and 21 in the Arches cluster, of which 13 are new detections. With the aid of proper motion membership samples, the disc fraction of the Quintuplet cluster was derived for the first time to be 4.0 +/- 0.7%. There is no evidence for a radially varying disc fraction in this cluster. In the case of the Arches cluster, a disc fraction of 9.2 +/- 1.2% approximately out to the cluster's predicted tidal radius, r < 1.5 pc, is observed. This excess fraction is consistent with our previously found disc fraction in the cluster in the radial range 0.3 < r < 0.8 pc. In both clusters, the host star mass range covers late A- to early B-type stars, 2 < M < 15 Msun, as derived from J-band photospheric magnitudes. We discuss the unexpected finding of dusty circumstellar discs in these UV intense environments in the context of primordial disc survival and formation scenarios of secondary discs. We consider the possibility that the L-band excess sources in the Arches and Quintuplet clusters could be the high-mass counterparts to T Tauri pre-transitional discs. As such a scenario requires a long pre-transitional disc lifetime in a UV intense environment, we suggest that mass transfer discs in binary systems are a likely formation mechanism for the B-star discs observed in these starburst clusters.

47 pages, 22 figures, accepted by A&A

References in corpus (16)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Binary interaction dominates the evolution of massive stars
• The UKIDSS Galactic Plane Survey
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• The most massive stars in the Arches cluster
• The Initial Mass Function of the Massive Star-forming Region NGC 3603 from Near-Infrared Adaptive Optics observations
• Kinematics of the old stellar population at the Galactic Center
• UV Radiation Fields Produced by Young Embedded Star Clusters
• Circumstellar disks around Herbig Be stars
• The proper motion of the Arches cluster with Keck Laser-Guide Star Adaptive Optics
• The Quintuplet Cluster I. A K-band spectral catalog of stellar sources
• The Quintuplet Cluster III. Hertzsprung-Russell diagram and cluster age
• The Quintuplet Cluster II. Analysis of the WN stars
• Molecular emission from GG Car's circumbinary disk
• 2.3 micron CO emission and absorption from young high-mass stars in M17

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• The Arches cluster revisited. III. An addendum to the stellar census
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• Variable Stars in the Quintuplet stellar cluster with the VVV Survey
• Young Massive Clusters: Their Population Properties, Formation and Evolution, and Their Relation to the Ancient Globular Clusters
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