论文标题
麦当劳加速星调查（Mass）：白矮人的同伴加速了阳光恒星12 PSC和HD 159062
The McDonald Accelerating Stars Survey (MASS): White Dwarf Companions Accelerating the Sun-like Stars 12 Psc and HD 159062
论文作者
论文摘要
我们介绍了G1 V Star 12 PSC发现的白矮人伴侣，作为KECK自适应光学成像的一部分，对麦当劳天文台行星搜索计划的长期加速恒星进行了长期加速恒星的调查。 Harlan J. Smith望远镜的Tull光谱仪的二十年精确的径向通风监测揭示了适度的径向加速度（$ \ $ \ $ \ $ \ $ \ $ 10 m s $^{ - 1} $ yr $^{ - 1} $），这与keck/nirir nirir nirc2 $ and $ hipprose $ hipprose $ hippare $ hipparey $ hippare $ hippare $ hippare and $ hiplose $动态质量为$ m_b $ = 0.605 $^{+0.021} _ { - 0.022} $ $ $ m _ {\ odot} $对于12 psc b，一个半马约尔轴为40 $^{+2} _ {+2} _ {-4} $ au，and centricity of 0.84 $ 0.84 $ $ 0.08。我们还报告了白色矮人伴侣的最新轨道拟合度（但富含钡的）G9 V DWARF HD 159062，基于来自Keck/Nirc2的Hobby-Eberly望远镜和天文仪的高分辨率光谱仪的新径向速度观测值。可用的相对星体，径向速度和切向星体加速度的联合拟合产生的动态质量为$ m_b $ = 0.609 $^{+0.010} _ { - 0.011} $ $ M _ {\ odot} $ for Hd 159062 b，semi-major Axis} AU，并且偏爱圆形轨道（$ E $$ <0.42 $ 0.42，以95％的信心）。 12 PSC B和HD 159062 B连接了一小部分已解决的“ Sirius样”基准白色矮人，并具有精确的动态质量测量值，这些测量是白矮人Mass-Radius冷却模型的有价值测试，以及AGB风力吸收量的探针在其主要伴侣身上。
We present the discovery of a white dwarf companion to the G1 V star 12 Psc found as part of a Keck adaptive optics imaging survey of long-term accelerating stars from the McDonald Observatory Planet Search Program. Twenty years of precise radial-velocity monitoring of 12 Psc with the Tull Spectrograph at the Harlan J. Smith telescope reveals a moderate radial acceleration ($\approx$10 m s$^{-1}$ yr $^{-1}$), which together with relative astrometry from Keck/NIRC2 and the astrometric acceleration between $Hipparcos$ and $Gaia$ DR2 yields a dynamical mass of $M_B$ = 0.605$^{+0.021}_{-0.022}$ $M_{\odot}$ for 12 Psc B, a semi-major axis of 40$^{+2}_{-4}$ AU, and an eccentricity of 0.84$\pm$0.08. We also report an updated orbit fit of the white dwarf companion to the metal-poor (but barium-rich) G9 V dwarf HD 159062 based on new radial velocity observations from the High-Resolution Spectrograph at the Hobby-Eberly Telescope and astrometry from Keck/NIRC2. A joint fit of the available relative astrometry, radial velocities, and tangential astrometric acceleration yields a dynamical mass of $M_B$ = 0.609$^{+0.010}_{-0.011}$ $M_{\odot}$ for HD 159062 B, a semi-major axis of 60$^{+5}_{-7}$ AU, and preference for circular orbits ($e$$<$0.42 at 95% confidence). 12 Psc B and HD 159062 B join a small list of resolved "Sirius-like" benchmark white dwarfs with precise dynamical mass measurements which serve as valuable tests of white dwarf mass-radius cooling models and probes of AGB wind accretion onto their main-sequence companions.
