%0 Generic %1 deacon20172mass %A Deacon, N. R. %A Magnier, E. A. %A Liu, Michael C. %A Schlieder, Joshua E. %A Aller, Kimberly M. %A Best, William M. J. %A Bowler, Brendan P. %A Burgett, W. S. %A Chambers, K. C. %A Draper, P. W. %A Flewelling, H. %A Hodapp, K. W. %A Kaiser, N. %A Metcalfe, N. %A Sweeney, W. E. %A Wainscoat, R. J. %A Waters, C. %D 2017 %K mdwarf multiplicity nearby %T 2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary %U http://arxiv.org/abs/1701.03104 %X 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-STARRS1 data and, despite its relative proximity to the Sun (22.2$_-4.0^+6.4$ pc; Pan-STARRS1 parallax) and brightness ($J$=15.3), 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 H$\alpha$ emission and shows evidence for UV flares. The binary's weak ıt GALEX UV emission and strong Na I 8200\AA Na absorption leads us to an age range of $\sim$1-10Gyr. Applying this age range to evolutionary models implies the wide companion has a mass of 0.063$\pm$0.009\,$M_ødot$. 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.

@preprint{deacon20172mass, 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-STARRS1 data and, despite its relative proximity to the Sun (22.2$_{-4.0}^{+6.4}$ pc; Pan-STARRS1 parallax) and brightness ($J$=15.3), 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 H$\alpha$ emission and shows evidence for UV flares. The binary's weak {\it GALEX} UV emission and strong Na I 8200\AA Na absorption leads us to an age range of $\sim$1-10Gyr. Applying this age range to evolutionary models implies the wide companion has a mass of 0.063$\pm$0.009\,$M_{\odot}$. 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.}, added-at = {2017-01-16T04:09:02.000+0100}, author = {Deacon, N. R. and Magnier, E. A. and Liu, Michael C. and Schlieder, Joshua E. and Aller, Kimberly M. and Best, William M. J. and Bowler, Brendan P. and Burgett, W. S. and Chambers, K. C. and Draper, P. W. and Flewelling, H. and Hodapp, K. W. and Kaiser, N. and Metcalfe, N. and Sweeney, W. E. and Wainscoat, R. J. and Waters, C.}, biburl = {https://www.bibsonomy.org/bibtex/2a5705857e4064b3d95cb42a390a2f7ff/superjenwinters}, description = {2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary}, interhash = {c6b1b3b4b95d428aa24349d0e5be651f}, intrahash = {a5705857e4064b3d95cb42a390a2f7ff}, keywords = {mdwarf multiplicity nearby}, note = {cite arxiv:1701.03104Comment: 14 pages, 12 figures, 2 tables, accepted for publication in MNRAS Updated in 2 column format}, timestamp = {2017-01-16T04:09:02.000+0100}, title = {2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary}, url = {http://arxiv.org/abs/1701.03104}, year = 2017 }