Discovery of an L4\(\beta\) Candidate Member of Argus in the Planetary Mass Regime: WISE J231921.92+764544.4

We present the discovery of a young L dwarf, WISE J231921.92+764544.4, identified by comparing the Wide-field Infrared Survey Explorer (WISE) All-Sky Catalog to the Two Micron All Sky Survey (2MASS). A medium-resolution optical spectrum provides a spectral type of L4\(\beta\), with a photometric dis...

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Bibliographic Details
Published in:arXiv.org 2015-12
Main Authors: Castro, Philip J, Gizis, John E
Format: Article
Language:English
Subjects:
Color
Extrasolar planets
Photometry
Planetary mass
Sky surveys (astronomy)
Wide-field Infrared Survey Explorer
Youth
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Summary:We present the discovery of a young L dwarf, WISE J231921.92+764544.4, identified by comparing the Wide-field Infrared Survey Explorer (WISE) All-Sky Catalog to the Two Micron All Sky Survey (2MASS). A medium-resolution optical spectrum provides a spectral type of L4\(\beta\), with a photometric distance estimate of 26.1\(\pm\)4.4 pc. The red WISE \(W1-W2\) color provides additional evidence of youth, while the 2MASS \(J-K_{\rm s}\) color does not. WISE J231921.92+764544.4 is a candidate member of the young moving group Argus, with the space motion and position of WISE J231921.92+764544.4 giving a probability of 79% membership in Argus and a probability of 21% as a field object, based on BANYAN II. WISE J231921.92+764544.4 has a mass of 12.1\(\pm\)0.4 M\(_{\rm Jup}\) based on membership in Argus, within the planetary mass regime.
ISSN:2331-8422
DOI:10.48550/arxiv.1512.06524