Banyan. X. Discovery of a Wide, Low-gravity L-type Companion to a Fast-rotating M3 Dwarf*

2017/11/29 by Marie-Eve Desrochers, M. E. Desrochers, Étienne Artigau +7 · 1 citation
Physics and Astronomy · #Artificial intelligence #Astrometry #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Brown dwarf #Computer science #Geology #Outlier #Paleontology #Physics #Stars #Stellar, planetary, and galactic studies #Type (biology) #astro-ph.SR

paper · pdf · doi:10.3847/1538-4357/aa9e86

16 pages, 12 figures

arxiv created 2017/11/29 · openalex created_date 2017/12/22 · openalex publication_date 2018/01/01 · arxiv updated 2018/01/10 · openalex updated_date 2026/08/05

Abstract

Abstract We report the discovery of a substellar-mass co-moving companion to 2MASS J22501512+2325342, an M3 candidate member of the young (130–200 Myr) AB Doradus Moving Group (ABDMG). This L3 β companion was discovered in a 2MASS search for companions at separations of 3″–18″ from a list of 2812 stars suspected to be young (≲500 Myr) in the literature, and was confirmed with follow-up astrometry and spectroscopy. Evolutionary models yield a companion mass of at the age of ABDMG. The 2MASS J22501512+2325342 AB system appears to be a spatial outlier to the bulk of ABDMG members, similarly to the young 2MASS J22362452+4751425 AB system. Future searches for young objects around these two systems would make it possible to determine whether they are part of a spatial extension of the known ABDMG distribution.

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