Circumstellar discs in the young sigma Orionis cluster

Details Circumstellar discs in the young sigma Orionis cluster Circumstellar discs in the young sigma Orionis cluster

2006-03-10

arxiv.org/abs/astro-ph/0603262v1

Mon.Not.Roy.Astron.Soc.369:272-280,2006

Astronomy and Astrophysics

Astrophysics

accepted by MNRAS main journal, 10 pages and 5 figures

Scientific paper

10.1111/j.1365-2966.2006.10299.x

We present new K- and L'-band imaging observations for members of the young (3-5 Myr) sigma Orionis cluster, obtained with UIST at UKIRT. We determine (K-L') colour excesses with respect to the photospheres, finding evidence for warm circumstellar dust around 27 out of 83 cluster members that have masses between 0.04 Msun and 1.0 Msun. This indicates a circumstellar disc frequency of at least (33 +/- 6)% for this cluster, consistent with previous determinations from smaller samples (Oliveira et al. 2004) and also consistent with the 3 Myr disc half-life suggested by Haisch et al. (2001). There is marginal evidence that the disc frequency declines towards lower masses, but the data are also consistent with no mass-dependence at all. There is no evidence for spatial segregation of objects with and without circumstellar discs.

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