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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150611T103000
DTEND;TZID=Atlantic/Canary:20150611T113000
UID:iactalks-793
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/793
CREATED:2015-06-11T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Spectroscopic analysis of a large sample of L and T dwarfs. 
DESCRIPTION:Spectroscopic analysis of a large sample of L and T dwarfs. \nD
 r. Federico Marocco\n\n A comprehensive understanding of sub-stellar 
 objects (brown dwarfs and extrasolar giant planets) and their population c
 haracteristics (e.g. IMF, formation history) is only possible through the 
 robust interpretation of ultra-cool objects spectroscopy. However, the phy
 sics of ultra-cool atmospheres is complicated by a variety of challenging 
 ingredients (dust properties, non-equilibrium chemistry, molecular opaciti
 es). Moreover, while hydrogen-burning stars stabilize on the stellar main-
 sequence, sub-stellar objects continuously cool down (since they lack an i
 nternal source of energy) and evolve towards later spectral types. Their a
 tmospheric parameters are a strong function of age. In this talk I will pr
 esent the spectroscopic analysis of a large sample of L and T dwarfs, comp
 lementing the spectroscopic data with astrometry from the PARSEC program, 
 in order to constrain the sub-stellar initial mass function and formation 
 history. I will then describe our new effort to identify and characterize 
 a large sample of benchmark systems, combining Gaia capabilities with larg
 e area near-infrared surveys such as UKIDSS, SDSS, and VVV, in order to ca
 librate effectively the theoretical models.      
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