The Parallax of VHS J1256-1257 from CFHT and Pan-STARRS 1
Dupuy, TJ; Liu, MC; Magnier, EA; et al.Best, WMJ; Baraffe, I; Chabrier, G; Forveille, T; Metchev, SA; Tremblin, P
Date: 16 April 2020
Journal
Research Notes of the AAS
Publisher
American Astronomical Society / IOP Publishing
Publisher DOI
Abstract
We present new parallax measurements from the CFHT Infrared Parallax Program and the Pan-STARRS 3π Steradian Survey for the young (≈150−300 Myr) triple system VHS J125601.92−125723.9. This system is composed of a nearly equal-flux binary ("AB") and a wide, possibly planetary-mass companion ("b"). The system's published parallactic ...
We present new parallax measurements from the CFHT Infrared Parallax Program and the Pan-STARRS 3π Steradian Survey for the young (≈150−300 Myr) triple system VHS J125601.92−125723.9. This system is composed of a nearly equal-flux binary ("AB") and a wide, possibly planetary-mass companion ("b"). The system's published parallactic distance (12.7±1.0 pc) implies absolute magnitudes unusually faint compared to known young objects and is in tension with the spectrophotometric distance for the central binary (17.2±2.6 pc). Our CFHT and Pan-STARRS parallaxes are consistent, and the more precise CFHT result places VHS J1256-1257 at 22.2+1.1−1.2 pc. Our new distance results in higher values for the companion's mass (19±5 MJup) and temperature (1240±50 K), and also brings the absolute magnitudes of all three components into better agreement with known young objects.
Physics and Astronomy
Faculty of Environment, Science and Economy
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