The McDonald Accelerating Stars Survey (MASS): White Dwarf Companions Accelerating the Sun-like Stars 12 Psc and HD 159062
Brendan P. Bowler, William D. Cochran, Michael Endl, Kyle Franson,, Timothy D. Brandt, Trent J. Dupuy, Phillip J. MacQueen, Kaitlin M. Kratter,, Dimitri Mawet, Garreth Ruane

TL;DR
This study reports the discovery and precise dynamical mass measurements of white dwarf companions to two Sun-like stars, using long-term radial velocity, astrometry, and adaptive optics imaging, providing benchmarks for white dwarf models.
Contribution
It presents the first dynamical mass measurements of white dwarf companions to 12 Psc and HD 159062, combining multiple observational techniques for accurate characterization.
Findings
Masses of white dwarf companions are approximately 0.605 and 0.609 solar masses.
Orbits have semi-major axes of about 40 and 60 AU, with high eccentricity and low eccentricity, respectively.
Results serve as benchmarks for white dwarf mass-radius models and AGB wind accretion studies.
Abstract
We present the discovery of a white dwarf companion to the G1 V star 12 Psc found as part of a Keck adaptive optics imaging survey of long-term accelerating stars from the McDonald Observatory Planet Search Program. Twenty years of precise radial-velocity monitoring of 12 Psc with the Tull Spectrograph at the Harlan J. Smith telescope reveals a moderate radial acceleration (10 m s yr ), which together with relative astrometry from Keck/NIRC2 and the astrometric acceleration between and DR2 yields a dynamical mass of = 0.605 for 12 Psc B, a semi-major axis of 40 AU, and an eccentricity of 0.840.08. We also report an updated orbit fit of the white dwarf companion to the metal-poor (but barium-rich) G9 V dwarf HD 159062 based on new radial velocity observations from the High-Resolution…
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