June 11 - 13, 2007 - Science Meeting - Foz do Iguaçu - Brazil June 14 - User's Meeting
June 15 - Gemini/NGO's Staff Meeting |
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Name: David Pinfield Institution: University of Hertfordshire e-mail: d.j.pinfield(no-spam)herts.ac.uk Partner Country: UK Science Meeting: Yes User Meeting: Yes NGO Staff Meeting: No Presentation: Yes Format: Oral Title: Confirming the first UKIDSS Y dwarfs using GNIRS Abstract: Y dwarfs are the as yet undiscovered population of sub-stellar objects cooler even than the known methane or T dwarfs, and are expected within the Teff=700-400K domain, where atmospheric water clouds and strong ammonia absorption could be evident. Y dwarf discovery is a key science driver for the UKIRT Infrared Deep Sky Survey (UKIDSS), which will probe ~3 magnitudes deeper than 2MASS across 7000 sq degs of sky. I am leading an ongoing GNIRS program on Gemini South (as part of an international collaboration, the UKIDSS Cool Dwarf Science Working Group) to measure spectra of LAS Y dwarf candides using "quick response" time. In this talk I will provide a summary of the results to date, including one object which is potentially a record breaking low-temperature discovery. The program has just been renewed across 07A-08B, and further exciting discoveries are expected. We have also just been awarded time on UKIRT, the WHT and the INT to do rapid photometric followup of Y dwarf candidates, to feed into the gemini/gnirs program. We are thus confident of additional new exciting results. |
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Gemini Science Meeting © 2007
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