WISE J072003.20-084651.2B Is A Massive T Dwarf
Trent J. Dupuy, Michael C. Liu, William M. J. Best, Andrew W. Mann,, Michael A. Tucker, Zhoujian Zhang, Isabelle Baraffe, Gilles Chabrier, Thierry, Forveille, Stanimir A. Metchev, Pascal Tremblin, Aaron Do, Anna V. Payne, B., J. Shappee, Charlotte Z. Bond, Sylvain Cetre

TL;DR
This paper reports precise measurements of the orbit and masses of the WISE J072003.20-084651.2AB binary system, revealing a massive T dwarf companion and refining its distance, orbit, and past close encounter with the solar system.
Contribution
It provides the first high-quality dynamical masses and orbit for this binary, improving understanding of low-mass star and brown dwarf properties and their orbital dynamics.
Findings
Dynamical masses: 99±6 M_Jup and 66±4 M_Jup.
Distance measured at 6.80 pc.
Closest approach to Sun was 68.7±2.0 kAU 80.5 kyr ago.
Abstract
We present individual dynamical masses for the nearby M9.5+T5.5 binary WISE J072003.20084651.2AB, a.k.a. Scholz's star. Combining high-precision CFHT/WIRCam photocenter astrometry and Keck adaptive optics resolved imaging, we measure the first high-quality parallactic distance ( pc) and orbit ( yr period) for this system composed of a low-mass star and brown dwarf. We find a moderately eccentric orbit (), incompatible with previous work based on less data, and dynamical masses of and for the two components. The primary mass is marginally inconsistent (2.1) with the empirical massmagnitudemetallicity relation and models of main-sequence stars. The relatively high mass of the cold ( K) brown dwarf companion indicates an age older…
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