High Spatial Resolution Thermal-Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC. (arXiv:1904.07892v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Briesemeister_Z/0/1/0/all/0/1">Zackery W. Briesemeister</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Skemer_A/0/1/0/all/0/1">Andrew J. Skemer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stone_J/0/1/0/all/0/1">Jordan M. Stone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barman_T/0/1/0/all/0/1">Travis S. Barman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hinz_P/0/1/0/all/0/1">Philip Hinz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Leisenring_J/0/1/0/all/0/1">Jarron Leisenring</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Skrutskie_M/0/1/0/all/0/1">Michael F. Skrutskie</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Woodward_C/0/1/0/all/0/1">Charles E. Woodward</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Spalding_E/0/1/0/all/0/1">Eckhart Spalding</a>

We present 2.9-4.1 micron 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
(LBTI). 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 extra-solar 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 pm 0.07 Gyr) of the system compared to the older age (0.79
pm 0.22 Gyr) determined with gyrochronology in order to address the luminosity
discrepancy.

We present 2.9-4.1 micron 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
(LBTI). 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 extra-solar 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 pm 0.07 Gyr) of the system compared to the older age (0.79
pm 0.22 Gyr) determined with gyrochronology in order to address the luminosity
discrepancy.

http://arxiv.org/icons/sfx.gif