The Orbit of the L dwarf + T dwarf Spectral Binary SDSS J080531.84+481233.0
Adam J. Burgasser (UC San Diego), Cullen H. Blake (U. Pennsylvania),, Christopher R. Gelino (NASA Exoplanet Science Institute/Caltech), Johannes, Sahlmann (European Space Astronomy Centre), and Daniella Bardalez Gagliuffi, (UC San Diego)

TL;DR
This study confirms the binary nature of SDSS J080531.84+481233.0 through four years of radial velocity data, revealing detailed orbital parameters, component masses, and system age, providing a key test case for brown dwarf evolution.
Contribution
The paper presents the first detailed orbital and physical characterization of the L+T dwarf binary SDSS J0805+4812AB based on extensive radial velocity monitoring.
Findings
Orbital period of 2.02 years with eccentricity 0.46
Component masses near the hydrogen minimum mass
System age estimated at over 4 billion years
Abstract
[abridged] We report four years of radial velocity monitoring observations of SDSS J080531.84+481233.0 that reveal significant and periodic variability, confirming the binary nature of the source. We infer an orbital period of 2.020.03 yr, a semi-major axis of 0.76 AU, and an eccentricity of 0.460.05, consistent with the amplitude of astrometric variability and prior attempts to resolve the system. Folding in constraints based on the spectral types of the components (L40.7 and T5.51.1), corresponding effective temperatures, and brown dwarf evolutionary models, we further constrain the orbital inclination of this system to be nearly edge-on (9019), and deduce a large system mass ratio (M/M = 0.86), substellar components (M = 0.057 M, M = 0.048 M),…
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