SIMBAD references

2015AJ....150..182K - Astron. J., 150, 182 (2015/December-0)

A targeted search for peculiarly red L and T dwarfs in SDSS, 2MASS, and WISE: discovery of a possible L7 member of the TW Hydrae association.


Abstract (from CDS):

We present the first results from a targeted search for brown dwarfs with unusual red colors indicative of peculiar atmospheric characteristics. These include objects with low surface gravities or with unusual dust content or cloud properties. From a positional cross-match of SDSS, 2MASS, and WISE, we have identified 40 candidate peculiar early-L to early-T dwarfs that are either new objects or have not been identified as peculiar through prior spectroscopy. Using low-resolution spectra, we confirm that 10 of the candidates are either peculiar or potential L/T binaries. With a J - Ks color of 2.62±0.15 mag, one of the new objects–the L7 dwarf 2MASS J11193254-1137466–is among the reddest field dwarfs currently known. Its proper motion and photometric parallax indicate that it is a possible member of the TW Hydrae moving group. If confirmed, it would be the lowest-mass (5-6 MJup) free-floating member. We also report a new T dwarf, 2MASS J22153705+2110554, that was previously overlooked in the SDSS footprint. These new discoveries demonstrate that despite the considerable scrutiny already devoted to the SDSS and 2MASS surveys, our exploration of these data sets is not yet complete.

Abstract Copyright:

Journal keyword(s): binaries: close - brown dwarfs - infrared: stars - stars: late-type - stars: peculiar

CDS comments: 2MASS J16094569+1426422 and 2MASS J17251557+6405005 not identified (do not exist in the 2MASS catalog), not in Simbad.

Simbad objects: 90

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