TY - JOUR
T1 - High Spatial Resolution Thermal Infrared Spectroscopy with ALES
T2 - Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC
AU - Briesemeister, Zackery W.
AU - Skemer, Andrew J.
AU - Stone, Jordan M.
AU - Barman, Travis S.
AU - Hinz, Philip
AU - Leisenring, Jarron
AU - Skrutskie, Michael F.
AU - Woodward, Charles E.
AU - Spalding, Eckhart
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019
Y1 - 2019
N2 - We present 2.9-4.1 μm integral field spectroscopy of the L4+L4 brown dwarf binary HD 130948BC, obtained with the Arizona Lenslets for Exoplanet Spectroscopy (ALES) mode of the Large Binocular Telescope Interferometer. The HD 130948 system is a hierarchical triple system, in which the G2V primary is joined by two co-orbiting brown dwarfs. By combining the age of the system with the dynamical masses and luminosities of the substellar companions, we can test evolutionary models of cool brown dwarfs and extrasolar giant planets. Previous near-infrared studies suggest a disagreement between HD 130948BC luminosities and those derived from evolutionary models. We obtained spatially resolved, low-resolution (R ∼ 20) L-band spectra of HD 130948B and C to extend the wavelength coverage into the thermal infrared. Jointly using JHK photometry and ALES L-band spectra for HD 130948BC, we derive atmospheric parameters that are consistent with parameters derived from evolutionary models. We leverage the consistency of these atmospheric quantities to favor a younger age (0.50 ± 0.07 Gyr) of the system compared to the older age (0.79-0.15 +0.22Gyr) determined with gyrochronology in order to address the luminosity discrepancy.
AB - We present 2.9-4.1 μm integral field spectroscopy of the L4+L4 brown dwarf binary HD 130948BC, obtained with the Arizona Lenslets for Exoplanet Spectroscopy (ALES) mode of the Large Binocular Telescope Interferometer. The HD 130948 system is a hierarchical triple system, in which the G2V primary is joined by two co-orbiting brown dwarfs. By combining the age of the system with the dynamical masses and luminosities of the substellar companions, we can test evolutionary models of cool brown dwarfs and extrasolar giant planets. Previous near-infrared studies suggest a disagreement between HD 130948BC luminosities and those derived from evolutionary models. We obtained spatially resolved, low-resolution (R ∼ 20) L-band spectra of HD 130948B and C to extend the wavelength coverage into the thermal infrared. Jointly using JHK photometry and ALES L-band spectra for HD 130948BC, we derive atmospheric parameters that are consistent with parameters derived from evolutionary models. We leverage the consistency of these atmospheric quantities to favor a younger age (0.50 ± 0.07 Gyr) of the system compared to the older age (0.79-0.15 +0.22Gyr) determined with gyrochronology in order to address the luminosity discrepancy.
KW - brown dwarfs
KW - infrared: stars
KW - techniques: imaging spectroscopy
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U2 - 10.3847/1538-3881/ab1901
DO - 10.3847/1538-3881/ab1901
M3 - Article
AN - SCOPUS:85072261156
SN - 0004-6256
VL - 157
JO - Astronomical Journal
JF - Astronomical Journal
IS - 6
M1 - 244
ER -