A search for new very low-mass members with disks in the Coronet cluster

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We report on the results of an infrared study of the Coronet cluster in the core of the Corona Australis star forming region. Spitzer IRAC and MIPS 24 micron data are combined with 2MASS near-infrared photometry to identify nine new candidate members of the cluster using different colour criteria documented in the literature. For three of them, optical photometry is available, enabling us to derive their effective temperatures and gravities from the fitting of their SEDs. According to our results, if they indeed belonged to the Coronet cluster, these three objects would be substellar, thus being among the lowest mass objects with disks identified so far in this region (M<0.030 Msol). One of these sources could be the lowest-mass object identified so far to possess a disk with an inner hole.

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