Program: GN-2012B-Q-105
Title: | Completing the nearby L dwarf sample |
PI: | John Gizis |
Co-I(s): | Philip Castro |
Abstract
We are using the WISE and 2MASS infrared sky survey to identify nearby bright L-type brown dwarfs close to the Galactic Plane, where 2MASS or SDSS-based surveys could not reliably identify them. In this proposal, we request optical spectroscopy of ten new bright L dwarfs, which will serve as new standards for detailed studies of substellar objects. We argue that optical spectroscopy provides important information that cannot be determined from near-infrared spectroscopy we have already obtained: The optical features are better temperature indicators, lithium is a mass/age indicator, H alpha is a chromospheric activity indicator, and the molecular bandheads are sensitive to surface gravity. Our targets include the reddest field L dwarf known, which uniquely proves extremely cloudy substellar atmospheric conditions, and the two closest L7-L8 dwarfs in the northern hemisphere.
Publications using this program's data
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[data]
[ADS] WISEP J004701.06+680352.1: An Intermediate Surface Gravity, Dusty Brown Dwarf in the AB Dor Moving Group
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[data]
[ADS] Kepler Monitoring of an L Dwarf. II. Clouds with Multi-year Lifetimes
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[data]
[ADS] Properties of the nearby Brown Dwarf WISEP J180026.60+013453.1
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[data]
[ADS] Discovery of an L4β Candidate Member of Argus in the Planetary Mass Regime: WISE J231921.92+764544.4
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[data]
[ADS] WISEP J060738.65+242953.4: A Nearby Pole-on L8 Brown Dwarf with Radio Emission