A DISK-BASED DYNAMICAL CONSTRAINT ON THE MASS OF THE YOUNG BINARY DQ TAU

ABSTRACT We present new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of CO J = 2−1 line emission from the DQ Tau circumbinary disk. These data are used to tomographically reconstruct the Keplerian disk velocity field in a forward-modeling inference framework, and thereby provide...

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Bibliographic Details
Published in:The Astrophysical journal 2016-02, Vol.818 (2), p.156
Main Authors: Czekala, I., Andrews, S. M., Torres, G., Jensen, E. L. N., Stassun, K. G., Wilner, D. J., Latham, D. W.
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Binary stars
Binary systems (materials)
CARBON MONOXIDE
COMPARATIVE EVALUATIONS
Disks
Dynamical systems
Dynamics
EMISSION
FORECASTING
MAIN SEQUENCE STARS
MASS
Mathematical models
Orbitals
protoplanetary disks
PROTOPLANETS
RADIAL VELOCITY
Radio telescopes
SIMULATION
STAR EVOLUTION
stars: fundamental parameters
stars: individual (DQ Tau)
stars: pre-main sequence
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Summary:ABSTRACT We present new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of CO J = 2−1 line emission from the DQ Tau circumbinary disk. These data are used to tomographically reconstruct the Keplerian disk velocity field in a forward-modeling inference framework, and thereby provide a dynamical constraint on the mass of the DQ Tau binary of . Those results are compared with an updated and improved orbital solution for this double-lined system based on long-term monitoring of its stellar radial velocities. Both of these independent dynamical constraints on the binary mass are in excellent agreement: taken together, they demonstrate that the DQ Tau system mass is 1.21 0.26 M and that the disk and binary orbital planes are aligned within 3° (at 3 confidence). The predictions of various theoretical models for pre-main-sequence stellar evolution are also consistent with these masses, though more detailed comparisons are difficult due to lingering uncertainties regarding the photospheric properties of the individual components. DQ Tau is the third, nearly equal-mass, double-lined spectroscopic binary with a circumbinary disk that has been dynamically "weighed" with these two independent techniques: all show consistent results, validating the overall accuracy of the disk-based approach and demonstrating that it can be robustly applied to large samples of young, single stars as ALMA ramps up to operations at full capacity.
ISSN:0004-637X
1538-4357
DOI:10.3847/0004-637X/818/2/156