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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120313T000000
DTEND;TZID=Atlantic/Canary:20120313T010000
UID:iactalks-373
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/373
CREATED:2012-03-13T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:A cross-match of 2MASS and SDSS: Peculiar L dwarfs and unresolved b
 inaries
DESCRIPTION:A cross-match of 2MASS and SDSS: Peculiar L dwarfs and unresolv
 ed binaries\nDr. Kerstin Geissler\n\nWe present the completion of a progra
 m to cross-correlate the SDSS Data  Release 1 and 2MASS Point Source Catal
 og in search for extremely red L  and T dwarfs. The program was initiated 
 by Metchev and collaborators,  who presented the findings on all newly ide
 ntified T dwarfs in SDSS DR1,  and estimated the space density of isolated
  T0--T8 dwarfs in the solar  neighbourhood. In the current work we present
  most of the L dwarf  discoveries. Our red-sensitive (z-J > 2.75 mag) c
 ross-match proves to  be efficient in detecting peculiarly red L dwarfs, a
 dding two new ones,  including one of the reddest known L dwarfs. Our sear
 ch also nets a new  peculiarly blue L7 dwarf and, surprisingly, two M8 dwa
 rfs. We further  broaden our analysis to detect unresolved binary L or T d
 warfs through  spectral template fitting to all L and T dwarfs presented h
 ere and in  the earlier work by Metchev and collaborators. We identify nin
 e probable  binaries, six of which are new and eight harbour likely T dwar
 f  secondaries. We combine this result with current knowledge of the mass 
  ratio distribution and frequency of substellar companions to estimate an 
  overall space density of 0.005--0.05 pc^{-3} for individual T0--T8  dwarf
 s.
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