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2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary

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.

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary Thumbnail


Authors

N.R. Deacon

E.A. Magnier

M.C. Liu

J.E. Schlieder

K.M. Aller

W.M.J. Best

B.P. Bowler

W.S. Burgett

K.C. Chambers

P.W. Draper

H. Flewelling

K.W. Hodapp

N. Kaiser

W.E. Sweeney

R.J. Wainscoat

C. Waters



Abstract

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 +6.4−4.0 −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.

Citation

Deacon, N., Magnier, E., Liu, M., Schlieder, J., Aller, K., Best, W., …Waters, C. (2017). 2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary. Monthly Notices of the Royal Astronomical Society, 467(1), 1126-1139. https://doi.org/10.1093/mnras/stx065

Journal Article Type Article
Acceptance Date Jan 10, 2017
Online Publication Date Jan 24, 2017
Publication Date May 11, 2017
Deposit Date Mar 13, 2017
Publicly Available Date Mar 17, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 467
Issue 1
Pages 1126-1139
DOI https://doi.org/10.1093/mnras/stx065
Public URL https://durham-repository.worktribe.com/output/1383149

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Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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