Thirteen New M Dwarf + T Dwarf Pairs Identified with WISE/NEOWISE
arxiv(2024)
摘要
We present the discovery of 13 new widely separated T dwarf companions to M
dwarf primaries, identified using WISE/NEOWISE data by the CatWISE and Backyard
Worlds: Planet 9 projects. This sample represents a ∼60
number of known M+T systems, and allows us to probe the most extreme products
of binary/planetary system formation, a discovery space made available by the
CatWISE2020 catalog and the Backyard Worlds: Planet 9 effort. Highlights among
the sample are WISEP J075108.79-763449.6, a previously known T9 thought to be
old due to its SED, which we now find is part of a common-proper-motion pair
with L 34-26 A, a well studied young M3 V star within 10 pc of the Sun; CWISE
J054129.32-745021.5 B and 2MASS J05581644-4501559 B, two T8 dwarfs possibly
associated with the very fast-rotating M4 V stars CWISE J054129.32-745021.5 A
and 2MASS J05581644-4501559 A; and UCAC3 52-1038 B, which is among the widest
late T companions to main sequence stars, with a projected separation of
∼7100 au. The new benchmarks presented here are prime JWST targets, and
can help us place strong constraints on formation and evolution theory of
substellar objects as well as on atmospheric models for these cold exoplanet
analogs.
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