T dwarfs in the Pleiades

Details T dwarfs in the Pleiades T dwarfs in the Pleiades

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40482j&link_type=abstract

Spitzer Proposal ID #40482

Physics

Scientific paper

Using a deep CFHT survey at I and Z which was followed up by a deep UKIRT survey in the J band five years later, we have identified seven T dwarfs in the Pleiades. This was done using their I, Z and J colours and their proper motions. These are low mass (~10 Jupiter masses) brown dwarfs. We request Spitzer IRAC time to obtain principally 3.6 and 4.5 micron photometry for these objects, and also 5.8 and 8.0 micron photometry, albeit at poor S/N. These observations will be executed as a cluster observation and as a fixed single observation. These measurements will allow us to determine precise spectral types and also possibly gravity sensitive features and evidence for remnant dust disks. This will also provide, for the first time, data on the sequence of T dwarfs of known age (120 Myr).

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