SIMP J2154–1055: A New Low-gravity L4β Brown Dwarf Candidate Member of the Argus Association

@article{Gagne2014SIMPJA,
  title={SIMP J2154–1055: A New Low-gravity L4$\beta$ Brown Dwarf Candidate Member of the Argus Association},
  author={Jonathan Gagn'e and David Lafreni{\`e}re and Ren{\'e} Doyon and 'Etienne Artigau and Lison Malo and Jasmin Robert and Daniel Nadeau},
  journal={The Astrophysical Journal},
  year={2014},
  volume={792}
}
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. 

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References

SHOWING 1-10 OF 48 REFERENCES
L and T brown dwarfs in the Ursa Major moving group
We have applied the “moving cluster” method to an archive of L and T brown dwarf stars to identify those stars which are members of the Ursa Major moving group.We show that five stars have proper
Spectroscopically confirmed brown dwarf members of Coma Berenices and the Hyades
We have obtained low- and medium-resolution spectra of nine brown dwarf candidate members of Coma Berenices and the Hyades using SpEX on the NASA InfraRed Telescope Facility and Long Slit
Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
We present an analysis of 23 L dwarfs whose optical spectra display unusual features. Twenty-one were uncovered during our search for nearby, late-type objects using the Two Micron All Sky Survey,
Discovery of the Brightest T Dwarf in the Northern Hemisphere
We report the discovery of a bright (H = 12.77) brown dwarf designated SIMP J013656.5+093347. The discovery was made as part of a near-infrared proper-motion survey, SIMP (Sondage Infrarouge de
The ages of L dwarfs
TLDR
A new method is presented to derive the age of young (<0.7 Gyr) L dwarfs based on their near-infrared photometry, colours and distances, including a known L dwarf binary, L dwarf companions and spectroscopic members of the young σ Orionis cluster.
Direct Imaging and Spectroscopy of a Planetary-Mass Candidate Companion to a Young Solar Analog
We present Gemini near-infrared adaptive optics imaging and spectroscopy of a planetary-mass candidate companion to 1RXS J160929.1–210524, a roughly solar-mass member of the 5 Myr old Upper Scorpius
SIMP: A Near‐Infrared Proper Motion Survey
SIMP is a proper motion (PM) survey made with the Observatoire du Mont Megantic (OMM) wide‐field near‐infrared camera CPAPIR at the CTIO 1.5 m and OMM 1.6 m telescopes. The SIMP observations were
Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs
Context. The fundamental properties of brown dwarfs evolve with age. Models describing the evolution of luminosities and effective temperatures, among other physical parameters, can be empirically
Discovery of very nearby ultracool dwarfs from DENIS
Received idate? / Accepted idate? Abstract. We report new spectroscopic results, obtained with UKIRT/CGS4, of a sample of 14 candidate ultracool dwarfs selected from the DENIS (Deep Near-Infrared
BANYAN. II. VERY LOW MASS AND SUBSTELLAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH
We present Bayesian Analysis for Nearby Young AssociatioNs II (BANYAN II), a modified Bayesian analysis for assessing the membership of later-than-M5 objects to any of several Nearby Young
...
...