The Astrophysical Journal (Jan 2024)

Thirteen New M Dwarf + T Dwarf Pairs Identified with WISE/NEOWISE

  • Federico Marocco,
  • J. Davy Kirkpatrick,
  • Adam C. Schneider,
  • Aaron M. Meisner,
  • Mark Popinchalk,
  • Christopher R. Gelino,
  • Jacqueline K. Faherty,
  • Adam J. Burgasser,
  • Dan Caselden,
  • Jonathan Gagné,
  • Christian Aganze,
  • Daniella C. Bardalez Gagliuffi,
  • Sarah L. Casewell,
  • Chih-Chun Hsu,
  • Rocio Kiman,
  • Peter R. M. Eisenhardt,
  • Marc J. Kuchner,
  • Daniel Stern,
  • Léopold Gramaize,
  • Arttu Sainio,
  • Thomas P. Bickle,
  • Austin Rothermich,
  • William Pendrill,
  • Melina Thévenot,
  • Martin Kabatnik,
  • Giovanni Colombo,
  • Hiro Higashimura,
  • Frank Kiwy,
  • Elijah J. Marchese,
  • Nikolaj Stevnbak Andersen,
  • Christopher Tanner,
  • Jim Walla,
  • Zbigniew Wędracki,
  • The Backyard Worlds Collaboration

DOI
https://doi.org/10.3847/1538-4357/ad3f1d
Journal volume & issue
Vol. 967, no. 2
p. 147

Abstract

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We present the discovery of 13 new widely separated T dwarf companions to M dwarf primaries, identified using Wide-field Infrared Survey Explorer/NEOWISE data by the CatWISE and Backyard Worlds: Planet 9 projects (hereafter BYW). This sample represents an ∼60% increase in the 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 BYW effort. Highlights among the sample are WISEP J075108.79-763449.6, a previously known T9 thought to be old due to its spectral energy distribution, which was found by Zhang et al. (2021b) to be part of a common proper motion pair with L34-26 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 J054129.32745021.5 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 the formation and evolution theory of substellar objects as well as on atmospheric models for these cold exoplanet analogs.

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