BANYAN. II. VERY LOW MASS AND SUBSTELLAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH

By J. Gagné, D. Lafrèniere, R. Doyon, L. Malo, É. Artigau. 2013

214 citations recorded by the source corpus.

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 Associations (NYAs). In addition to using kinematic information (from sky position and proper motion), this analysis exploits 2MASS–WISE color–magnitude diagrams in which old and young objects follow distinct sequences. As an improvement over our earlier work, the spatial and kinematic distributions for each association are now modeled as ellipsoids whose axes need not be aligned with the Galactic coordinate axes, and we use prior probabilities matching the expected populations of the NYAs considered versus field stars. We present an extensive contamination analysis to characterize the performance of our new method. We find that Bayesian probabilities are generally representative of contamination rates, except when a parallax measurement is considered. In this case contamination rates become significantly smaller and hence Bayesian probabilities for NYA memberships are pessimistic. We apply this new algorithm to a sample of 158 objects from the literature that are either known to display spectroscopic signs of youth or have unusually red near-infrared colors for their spectral type. Based on our analysis, we identify 25 objects as new highly probable candidates to NYAs, including a new M7.5 bona fide member to Tucana-Horologium, making it the latest-type member. In addition, we reveal that a known L2γ dwarf is co-moving with a bright M5 dwarf, and we show for the first time that two of the currently known ultra red L dwarfs are strong candidates to the AB Doradus moving group. Several objects identified here as highly probable members to NYAs could be free-floating planetary-mass objects if their membership is confirmed.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/162e538b7c8c9f9fe6a90b088377c69d81cce05d

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Citations in the corpus

THE HAWAII INFRARED PARALLAX PROGRAM. II. YOUNG ULTRACOOL FIELD DWARFS (2016, methodology): “…2MASS J2148+4003 (6–7MJup), and 2MASS J2351+3010 (9–11 MJup) from Gagné et al. (2014b); 2MASS J0030−1450 (10.8 +0.4 −0.6 MJup), 2MASS J0501−0010 (10.2+0.8−1.0 MJup), and 2MASS J2213−2136 (13.5±0.3MJup) fromGagné et al. (2015a); and SIMP J2154−1055 (10.3+0.7 −0.3 MJup) from Gagné et al. (2014a).”
A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2 (2015, methodology): “Its 6- dimensional UVWXY Z position is inconsistent with the well-known nearby young (≈10–100 Myr) groups summarized by Gagné et al. (2014), as well as other sparser or slightly older groups (Shkolnik et al. 2009; Zuckerman et al. 2013).”
Imaging Extrasolar Giant Planets (2016, unknown): “…2010; Rodriguez et al. 2011a; Schlieder et al. 2012a; Schlieder et al. 2012b; Shkolnik et al. 2012; Malo et al. 2013; Moor et al. 2013; Rodriguez et al. 2013; Malo et al. 2014; Gagné et al. 2014; Riedel et al. 2014; Kraus et al. 2014b; Gagné et al. 2015b; Gagné et al. 2015c; Binks et al. 2015).”
WEATHER ON OTHER WORLDS. II. SURVEY RESULTS: SPOTS ARE UBIQUITOUS ON L AND T DWARFS (2014, methodology): “2MASS J16154255+4953211 (L4β) is identified as a possible low-gravity L4 dwarf from optical spectra by Cruz et al. (2007) and Gagné et al. (2014).”
BANYAN. VII. A NEW POPULATION OF YOUNG SUBSTELLAR CANDIDATE MEMBERS OF NEARBY MOVING GROUPS FROM THE BASS SURVEY (2015, methodology): “This is reminiscent of 2MASS J12474428– 3816464, TWA 29 and TWA 31, which are young and seem to be located between TWA and SCC in terms of distance (Song et al. 2003; Schneider et al. 2012; Gagné et al. 2014a; Paper V).”
CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS (2015, background): “However, Reiners & Basri (2010) observed flaring activity in a J07523+162 spectrum (pEW(Hα) = – 44.4 Å) and Gagné et al. (2014) and Klutsch et al. (2014) were not able to determine membership in any known stellar kinematic group.”
A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood (2015, background): “Interestingly, the recent discovery of a Li-rich M8 high-probability brown dwarf candidate member (2MASS J00192626+4614078; Gagné et al. 2014) provides us with a strong upper limit on the age of the group of 196 Myr (Binks, private communication).”
PLANETS AROUND LOW-MASS STARS (PALMS). IV. THE OUTER ARCHITECTURE OF M DWARF PLANETARY SYSTEMS (2014, methodology): “This is further bolstered by an 86% membership probability by the BANYAN II web tool from Gagné et al. (2014)16.”
BANYAN. XI. The BANYAN Σ Multivariate Bayesian Algorithm to Identify Members of Young Associations with 150 pc (2018, methodology): “This is similar to the functioning of BANYAN I (Malo et al. 2013) and BANYAN II (Gagné et al. 2014).”