Near- and mid-infrared photometry of the pleiades and a new list of substellar candidate members
Stauffer, John R × Hartmann, Lee W Fazio, Giovanni G Allen, Lori E Patten, Brian M Lowrance, Patrick J Hurt, Robert L Rebull, Luisa M Cutri, Roc M Ramirez, Solange V Young, Erick T Rieke, George H Gorlova, Nadiya Muzerolle, James C Slesnick, Cathy L Skrutskie, Michael F #
Published by the University of Chicago Press for the American Astronomical Society
The Astrophysical Journal. Supplement Series vol:172 issue:2 pages:663-685
We make use of new near- and mid-IR photometry of the Pleiades cluster in order to help identify proposed cluster members. We also use the new photometry with previously published photometry to define the single-star main-sequence locus at the age of the Pleiades in a variety of color-magnitude planes. The new near- and mid-IR photometry extend effectively 2 mag deeper than the 2MASS All-Sky Point Source catalog, and hence allow us to select a new set of candidate very low-mass and substellar mass members of the Pleiades in the central square degree of the cluster. We identify 42 new candidate members fainter than K-s = 14 (corresponding to 0.1 M-circle dot). These candidate members should eventually allow a better estimate of the cluster mass function to be made down to of order 0.04M(circle dot). We also use new IRAC data, in particular the images obtained at 8 mu m, in order to comment briefly on interstellar dust in and near the Pleiades. We confirm, as expected, that-with one exception-a sample of low-mass stars recently identified as having 24 mu m excesses due to debris disks do not have significant excesses at IRAC wavelengths. However, evidence is also presented that several of the Pleiades high-mass stars are found to be impacting with local condensations of the molecular cloud that is passing through the Pleiades at the current epoch.