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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742770.0, MPI für Astronomie / Publikationen_mpia
2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary
Authors:Deacon, N. R.; Magnier, E. A.; Liu, M. C.; Schlieder, J. E.; Aller, K. M.; Best, W. M. J.; Bowler, B. P.; Burgett, W. S.; Chambers, K. C.; Draper, P. W.; Flewelling, H.; Hodapp, K. W.; Kaiser, N.; Metcalfe, N.; Sweeney, W. E.; Wainscoat, R. J.; Waters, C.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:1126
End Page:1139
Audience:Not Specified
Abstract / Description:We present the discovery of a 360 au separation T3 companion to the tight (3.1 au) M4.5+M6.5 binary 2MASS J02132062+3648506. This companion was identified using Pan-STARRS 1 data and despite its relative proximity to the Sun (22.2_{-4.0}^{+6.4} pc; Pan-STARRS 1 parallax) and brightness (J = 15.3), it appears to have been missed by previous studies due to its position near a diffraction spike in 2MASS. The close M dwarf binary has active X-ray and Hα emission and shows evidence for UV flares. The binary's weak GALEX UV emission and strong Na i 8200 Å Na absorption lead us to an age range of ∼1-10 Gyr. Applying this age range to evolutionary models implies that the wide companion has a mass of 0.063 ± 0.009 M. 2MASS J0213+3648 C provides a relatively old benchmark close to the L/T transition and acts as a key, older comparison to the much younger early-T companions HN Peg B and GU Psc b.
Free Keywords:binaries: visual; brown dwarfs; stars: low-mass
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stx065
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