Fire spectroscopy of the ultra-cool brown dwarf, UGPS J072227.51-054031.2: Kinematics, rotation and atmospheric parameters
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Simcoe_Fire spectroscopy of the ultra.pdf
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Author(s)
Bochanski, John J.
Burgasser, Adam J.
Simcoe, Robert A.
West, Andrew A.
Date Issued
October 2011
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Bochanski, John J. et al. “FIRE SPECTROSCOPY OF THE ULTRA-COOL BROWN DWARF, UGPS J072227.51–054031.2: KINEMATICS, ROTATION AND ATMOSPHERIC PARAMETERS.” The Astronomical Journal 142.5 (2011): 169.
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Author's final manuscript
Abstract
We present λ/Δλ ~ 6000 near-infrared spectroscopy of the nearby T9 dwarf, UGPS J072227.51–054031.2, obtained during the commissioning of the Folded-Port Infrared Echellette Spectrograph on the Baade Magellan telescope at Las Campanas Observatory. The spectrum is marked by significant absorption from H[subscript 2]O, CH[subscript 4], and H[subscript 2]. We also identify NH[subscript 3] absorption features by comparing the spectrum to recently published line lists. The spectrum is fit with BT-Settl models, indicating T [subscript eff] ~500-600 K and log g ~4.3-5.0. This corresponds to a mass of ~10-30 M {subscript Jup] and an age of 1-5 Gyr, however, there are large discrepancies between the model and observed spectrum. The radial and rotational velocities of the brown dwarf are measured as 46.9 ± 2.5 and 40 ± 10 km s[superscript –1], respectively, reflecting a thin disk Galactic orbit and fast rotation similar to other T dwarfs, suggesting a young, possibly planetary-mass brown dwarf.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-6256/142/5/169
