BANYAN. X. Discovery of a wide, low-gravity L-type companion to a fast-rotating M3 dwarf

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 beta companion was discovered in a 2MASS search for companions at separations of 3--18" from a list of 2 812 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 30 (-4,+11) Mj 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.

16 pages, 12 figures

References in corpus (20)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• A Stellar Census of the Tucana-Horologium Moving Group
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• JHK Observations of Faint Standard Stars in the Mauna Kea Near-Infrared Photometric System
• Lithium Depletion of Nearby Young Stellar Associations
• BANYAN. IV. Fundamental parameters of low-mass star candidates in nearby young stellar kinematic groups - Isochronal Age determination using Magnetic evolutionary models
• Discovery of a wide planetary-mass companion to the young M3 star GU Psc
• Spatial Distributions of Young Stars
• On the age heterogeneity of the Pleiades, Hyades and Sirius moving groups
• BANYAN. IX. The Initial Mass Function and Planetary-Mass Object Space Density of the TW Hya Association
• New low-mass members of the Octans stellar association and an updated 30-40 Myr lithium age
• MASSIVE: A Bayesian analysis of giant planet populations around low-mass stars
• Planets Around Low-Mass Stars (PALMS). VI. Discovery of a Remarkably Red Planetary-Mass Companion to the AB Dor Moving Group Candidate 2MASS J22362452+4751425
• A Brown Dwarf Census from the SIMP Survey
• Brown Dwarf Binaries from Disintegrating Triple Systems
• Spectroscopic follow-up of L- and T-type proper-motion member candidates in the Pleiades

Cited by in corpus (4)

• Dynamical Mass of the Young Substellar Companion HD 984 B
• Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the models
• Increasing the census of L and T dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
• Two close binaries across the hydrogen-burning limit in the Praesepe open cluster