Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1   We present the discovery of 61 wide (>5 arcsecond) separation, low-mass
(stellar and substellar) companions to stars in the solar neighborhood
identified from Pan-STARRS\,1 (PS1) data and the spectral classification of 27
previously known companions. Our companions represent a selective subsample of
promising candidates and span a range in spectral type of K7-L9 with the
addition of one DA white dwarf. These were identified primarily from a
dedicated common proper motion search around nearby stars, along with a few as
serendipitous discoveries from our Pan-STARRS1 brown dwarf search. Our
discoveries include 24 new L dwarf companions and one known L dwarf not
previously identified as a companion. The primary stars around which we
searched for companions come from a list of bright stars with well-measured
parallaxes and large proper motions from the Hipparcos catalog (8583 stars,
mostly A-K~dwarfs) and fainter stars from other proper motion catalogues (79170
stars, mostly M~dwarfs). We examine the likelihood that our companions are
chance alignments between unrelated stars and conclude that this is unlikely
for the majority of the objects that we have followed-up spectroscopically. We
also examine the entire population of ultracool (>M7) dwarf companions and
conclude that while some are loosely bound, most are unlikely to be disrupted
over the course of $\sim$10 Gyr. Our search increases the number of ultracool M
dwarf companions wider than 300 AU by 88% and increases the number of L dwarf
companions in the same separation range by 96%. Finally, we resolve our new L
dwarf companion to HIP 6407 into a tight (0.13 arcsecond, 7.4 AU) L1+T3 binary,
making the system a hierarchical triple. Our search for these key benchmarks
against which brown dwarf and exoplanet atmosphere models are tested has
yielded the largest number of discoveries to date.

19
The categories of this paper are: eess
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph