SIMP J2154-1055: A New Low-gravity L4β Brown Dwarf Candidate Member of the Argus Association
Abstract
We present SIMP J21543454-1055308, a new L4β brown dwarf identified in the SIMP survey that displays signs of low gravity in its near-infrared spectrum. Using BANYAN II, we show that it is a candidate member of the Argus association, albeit with a 21% probability that it is a contaminant from the field. Measurements of radial velocity and parallax will be needed to verify its membership. If it is a member of Argus (age 30-50 Myr), then this object would have a planetary mass of 10 ± 0.5 M Jup.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2014
- DOI:
- 10.1088/2041-8205/792/1/L17
- arXiv:
- arXiv:1407.5344
- Bibcode:
- 2014ApJ...792L..17G
- Keywords:
-
- brown dwarfs;
- methods: data analysis;
- proper motions;
- stars: kinematics and dynamics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 5 pages, 4 figures, accepted for publication in the ApJ Letters. Minor modifications to text and references