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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69dd43a792b12
DTSTAMP:20260413T152735
DTSTART:20151217T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20151217T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/640319-a-method-for-s
 electing-m-dwarfs-with-an-increased-likelihood-of-unresolved-ultra-cool-co
 mpanionship-neil-cook-university-of-hertfordshire
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:A Method for Selecting M dwarfs with an Increased Likelihood of Unr
 esolved Ultra-cool Companionship - Neil Cook (University of Hertfordshire)
DESCRIPTION:Title:A Method for Selecting M dwarfs with an Increased Likelih
 ood of Unresolved Ultra-cool Companionship 
\nAbstract:Locating ultra-cool
  companions to M dwarfs is important for constraining low-mass formation m
 odels\, the measurement of sub-stellar dynamical masses and radii\, and fo
 r testing ultra-cool evolutionary models. We present an optimised method f
 or identifying M dwarfs which may have unresolved ultra-cool companions. W
 e construct a catalogue of 440\,694 M dwarf candidates\, from WISE\, 2MASS
  and SDSS\, based on optical and near-infrared colours and reduced proper 
 motion. With strict reddening\, photometric and quality constraints we iso
 late a sub-sample of 36\,898 M dwarfs and search for possible mid-infrared
  M dwarf + ultra-cool dwarf candidates by comparing M dwarfs which have si
 milar optical/near-infrared colours (chosen for their sensitivity to effec
 tive temperature and metallicity). We present 1\,082 M dwarf + ultra-cool 
 dwarf candidates for follow-up. Using simulated ultra-cool dwarf companion
 s to M dwarfs\, we estimate that the occurrence of unresolved ultra-cool c
 ompanions amongst our M dwarf + ultra-cool dwarf candidates should be at l
 east four times the average for our full M dwarf catalogue. We discuss pos
 sible contamination and bias and predict yields of candidates based on our
  simulations.
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