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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130312T123000
DTEND;TZID=Atlantic/Canary:20130312T133000
UID:iactalks-474
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/474
CREATED:2013-03-12T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:GTC OSIRIS z-band imaging of Y dwarfs 
DESCRIPTION:GTC OSIRIS z-band imaging of Y dwarfs \nDr. Nicolas Lodieu\n\nT
 he stellar spectroscopic sequence has now been extended into very cool obj
 ects bridging the gap between low-mass stars and classical planets. Those 
 objects, called Y dwarfs, are the coolest substellar objects known to date
  with temperatures below 500 Kelvins. We obtained z-band far-red imaging f
 or six Y dwarfs and a T9+Y0 binary with GTC/OSIRIS to characterise their s
 pectral energy distribution. This photometric dataset represent the first 
 optical detection of Y dwarfs. I will present the z-band photometry, optic
 al-to-infrared colours, and proper motions of these Y dwarfs. I will discu
 ss the larger dispersion in the optical-to-infrared colours of Y dwarfs th
 an in warmer brown dwarfs, which may originate from presence of sulfide cl
 ouds, the depletion of alcalines, and/or gravity effects.
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