Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass
  Ratio Brown Dwarf Companion to an Accelerating Sun-like Star   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$\sigma$ astrometric acceleration on the star as detected with the $Gaia$
and $Hipparcos$ satellites. SCExAO/CHARIS $JHK$ (1.1--2.4 $\mu$m) spectra and
Keck/NIRC2 $L_{\rm p}$ (3.78 $\mu$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.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat