Searching for Brown Dwarfs and Brown Dwarf Binaries in Upper Scorpius, the Trapezium, and IC 348 Using the UKIDSS Galactic Cluster Survey

Details Searching for Brown Dwarfs and Brown Dwarf Binaries in Upper Scorpius, the Trapezium, and IC 348 Using the UKIDSS Galactic Cluster Survey Searching for Brown Dwarfs and Brown Dwarf Binaries in Upper Scorpius, the Trapezium, and IC 348 Using the UKIDSS Galactic Cluster Survey

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743413a&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We conducted a survey of three young star forming regions using the UKIRT Infrared Deep Sky Galactic Cluster Survey (GCS) Database Release 7 to identify a sample of brown dwarf and brown dwarf binary system candidates. The known distances to and ages of the young star forming regions queried (the Upper Scorpius association, the Trapezium Cluster in Orion, and IC 348 in the Perseus OB Association) allow us to estimate masses for the candidate brown dwarfs, using appropriate evolutionary models (Chabrier et al. 2000, Baraffe et al. 2002, Baraffe et al. 1998).
Brown dwarf candidates were selected based on their infrared luminosity (J, H, and K bands) and a corresponding drop-off in shorter wavelength luminosity (Z and Y bands). A series of color cuts, taken from Lodieu et al., 2006, were applied to (Z - J, Z) color-magnitude diagrams to select the fainter, redder candidates from the brighter sources in the survey regions. Cross-correlation of the GCS data with the 2MASS database provided a second epoch of information, further narrowing the list of brown dwarf candidates to only those proper motion members of the surveyed clusters.
The continued discovery and classification of young brown dwarfs in star forming regions allows us to better model the substellar initial mass function and understand sub-stellar formation processes. In particular, our survey of Upper Sco produced 170 brown dwarf and low-mass stellar candidates, and 4 candidate brown dwarf binary systems, which were used to derive a substellar IMF that corresponds well with other substellar IMFs found from previous surveys of different regions in Upper Sco.
This work was conducted through a Research Experience for Undergraduates (REU) position at the University of Hawaii's Institute for Astronomy, with funding provided by the NSF.

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