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

• DOI: 10.3847/1538-4357/ad3f1d
• Publication Date: 2024-05-29T18:55:43Z
• Authors: Federico Marocco; J. Davy Kirkpatrick; Adam C. Schneider; Aaron M. Meisner; Mark Popinchalk; Christopher R. Ge...; Jacqueline K. Fah...; Adam J. Burgasser; Dan Caselden; Jonathan Gagné; Christian Aganze; Daniella C. Barda...; Sarah L. Casewell; Chih-Chun Hsu; Rocio Kiman; Peter R. M. Eisen...; Marc J. Kuchner; Daniel Stern; Léopold Gramaize; Arttu Sainio; Thomas P. Bickle; Austin Rothermich; William Pendrill; Melina Thévenot; Martin Kabatnik; Giovanni Colombo; Hiro 村滉 Higashimu...; Frank Kiwy; Elijah J. Marchese; Nikolaj Stevnbak ...; Christopher Tanner; Jim Walla; Zbigniew Wędracki
• Keywords: Earth and Planetary Astrophysics (astro-ph.EP); Brown dwarfs; FOS: Physical sciences; Fundamental parameters of stars; Astrophysics; 01 natural sciences; 520; Visual binary stars; QB460-466; Astrophysics - Solar and Stellar Astrophysics; 0103 physical sciences; Low mass stars; T dwarfs; Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics - Earth and Planetary Astrophysics

Abstract We present the discovery of 13 new widely separated T dwarf companions to M primaries, identified using Wide-field Infrared Survey Explorer/NEOWISE data by CatWISE and Backyard Worlds: Planet 9 projects (hereafter BYW). This sample represents an ∼60% increase in number known + systems, allows us probe most extreme products binary/planetary system formation, a space made available CatWISE2020 catalog BYW effort. Highlights among are WISEP J075108.79-763449.6, previously T9 thought be old due its spectral energy distribution, which was found Zhang et al. (2021b) part common proper motion pair with L34-26 A, well-studied young M3 V star within 10 pc Sun; CWISE J054129.32-745021.5 B 2MASS J05581644-4501559 B, two T8 dwarfs possibly associated very fast-rotating M4 stars J054129.32745021.5 A A; UCAC3 52-1038 is widest late-T main-sequence stars, projected separation ∼7100 au. The benchmarks presented here prime JWST targets, can help place strong constraints on formation evolution theory substellar objects as well atmospheric models for these cold exoplanet analogs.