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24 papers
SpeX Spectroscopy of Unresolved Very Low-Mass Binaries. I. Identification of Seventeen Candidate Binaries Straddling the L Dwarf/T Dwarf Transition
Adam J. Burgasser, Kelle L. Cruz, Michael Cushing +5
We report the identification of 17 candidate brown dwarf binaries whose components straddle the L dwarf/T dwarf transition. These sources were culled from a large near-infrared spe…
Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
Sarah J. Schmidt, Kelle L. Cruz, Bethany J. Bongiorno +2
We present the activity and kinematics of a representative volume-limited (20 pc) sample of 152 late-M and L dwarfs (M7--L8) photometrically selected from the Two Micron All-Sky Su…
Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
Kelle L. Cruz, I. Neill Reid, J. Davy Kirkpatrick +7
We present a 20-pc, volume-limited sample of M7-L8 dwarfs created through spectroscopic follow-up of sources selected from the Two Micron All Sky Survey (2MASS) Second Incremental…
Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
Adam J. Burgasser, J. Davy Kirkpatrick, Kelle L. Cruz +5
We present the results of a Hubble Space Telescope NICMOS imaging survey of 22 T-type field brown dwarfs. Five are resolved as binary systems with angular separations of 0"05-0"35,…
The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
Adam J. Burgasser, Michael W. McElwain, J. Davy Kirkpatrick +3
We present the discovery of seven new T dwarfs identified in the Two Micron All Sky Survey. Low-resolution (R150) 0.8--2.5 micron spectroscopy obtained with the IRTF SpeX ins…
S Ori 70: Just a Foreground Field Brown Dwarf?
Adam J. Burgasser, J. Davy Kirkpatrick, Mark R. McGovern +3
We examine recent claims that the T-type brown dwarf S Ori 053810.1-023626 (S Ori 70) is a spectroscopically verified low mass (3 M) member of the 1--8 Myr …