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20 April 2024 |
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On the low-mass diskless population of Corona Australis | | Belén López Martí
; Loredana Spezzi
; Bruno Merín
; María Morales-Calderón
; Hervé Bouy
; David Barrado
; Jochen Eislöffel
; | | Date: |
15 Mar 2010 | | Abstract: | We combine published optical and near-infrared photometry to identify new
low-mass candidate members in an area of about 0.64 deg^2 in Corona Australis,
using the S-parameter method developed by Comer’on et al. (2009). Five new
candidate members of the region are selected, with estimated ages between 3 and
15 Myr, and masses between 0.05 and 0.15 M_Sun. Using Spitzer photometry, we
confirm that these objects are not surrounded by optically thick disks.
However, one of them is found to display excess at 24 micron, thus suggesting
it harbours a disk with an inner hole. With an estimated mass of 0.07 M_Sun
according to the SED fitting, this is one of the lowest-mass objects reported
to possess a transitional disk.
Including these new members, the fraction of disks is about 50% among the
total Corona Australis population selected by the same criteria, lower than the
70% fraction reported by Sicilia-Aguilar et al. (2008) for this region. Even
so, we find a ratio of transitional to primordial disks (45%) very similar to
the value derived by these authors. This ratio is higher than for solar-type
stars (5-10%), suggesting that disk evolution is faster in the latter, and/or
that the "transitional disk" stage is not such a short-lived step in the case
of very low-mass objects. However, this impression needs to be confirmed with
better statistics. | | Source: | arXiv, 1003.2894 | | Services: | Forum | Review | PDF | Favorites | |
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