论文标题
scexao/charis直接成像发现20个AU分离，低质量比率棕色矮人伴侣与加速的太阳恒星
SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
论文作者
论文摘要
我们以$ \ sim $ 20 $ 20 au的预计分离介绍了附近的阳光恒星HD 33632 AA的直接成像发现，该恒星使用scexao/charis/charis积分田间光谱仪获得的$ \ sim $ 20 au。同伴，HD 33632 AB，在$ GAIA $和$ HIPPARCOS $卫星上检测到的星星上诱导了10.5 $σ$的星体加速度。 scexao/charis $ jhk $（1.1---2.4 $ $ m）光谱和凯克/nirc2 $ l _ {\ rm p} $（3.78 $μ$ m）的光度法最好与场l/t l/t exraltion对象相匹配：较大的较大的重力，较高的重力，较高的重力和较少的灰尘与hr 8799 cde。将我们的天文学与$ GAIA/HIPPARCOS $数据和档案lick lickatoration radial速度相结合，我们测量的动态质量为46.4 $ \ pm $ 8 $ M _ {\ rm j} $，以及以95 \％信心的偏见。 HD 33632 AB的质量和质量比（4.0 \％$ \ pm $ 0.7 \％）可与低质量的棕色Dwarf GJ 758 B相媲美，并在更大的棕色矮人HD HD 19467 B和（接近）的Planet Massions与HR 2562和GJ 504的最佳选择中进行了中间。与盲目调查相比，系统可以在太阳系样量表上揭示下来的尺度尺度上的近代群体伴侣。
We present the direct imaging discovery of a substellar companion to the nearby Sun-like star, HD 33632 Aa, at a projected separation of $\sim$ 20 au, obtained with SCExAO/CHARIS integral field spectroscopy complemented by Keck/NIRC2 thermal infrared imaging. The companion, HD 33632 Ab, induces a 10.5$σ$ astrometric acceleration on the star as detected with the $Gaia$ and $Hipparcos$ satellites. SCExAO/CHARIS $JHK$ (1.1--2.4 $μ$m) spectra and Keck/NIRC2 $L_{\rm p}$ (3.78 $μ$m) photometry are best matched by a field L/T transition object: an older, higher gravity, and less dusty counterpart to HR 8799 cde. Combining our astrometry with $Gaia/Hipparcos$ data and archival Lick Observatory radial-velocities, we measure a dynamical mass of 46.4 $\pm$ 8 $M_{\rm J}$ and an eccentricity of $e$ $<$0.46 at 95\% confidence. HD 33632 Ab's mass and mass ratio (4.0\% $\pm$ 0.7\%) are comparable to the low-mass brown dwarf GJ 758 B and intermediate between the more massive brown dwarf HD 19467 B and the (near-)planet mass companions to HR 2562 and GJ 504. Using $Gaia$ to select for direct imaging observations with the newest extreme adaptive optics systems can reveal substellar or even planet-mass companions on solar system-like scales at an increased frequency compared to blind surveys.
