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Follow-Up Parallaxes of UKIDSS T-Dwarfs

Follow-Up Parallaxes of UKIDSS T-Dwarfs. Ricky Smart, Hugh Jones, Mario Lattanzi, David Pinfield, Dafydd Wyn Evans UKIDSS Cool Dwarfs Science Working Group. Why Parallaxes. Luminosity Space velocity Resolve model degeneracies e.g. surface gravity and metallicity

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Follow-Up Parallaxes of UKIDSS T-Dwarfs

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  1. Follow-Up Parallaxes of UKIDSS T-Dwarfs Ricky Smart, Hugh Jones, Mario Lattanzi, David Pinfield, Dafydd Wyn Evans UKIDSS Cool Dwarfs Science Working Group

  2. Why Parallaxes • Luminosity • Space velocity • Resolve model degeneracies • e.g. surface gravity and metallicity • Binarity and Outlier identification • H-R Diagram details

  3. Why WFCAM • Discovered –> Observable • First epoch image • Service/Flexible observations • Only 30min/target/semester • Not possible on smaller telescopes • Gaia only 1/6

  4. Why not WFCAM Absolute & Differential Distortions http://casu.ast.cam.ac.uk/surveys-projects/wfcam/technical/astrometry

  5. Long Term Testing • Compare 5 frames over 1 year • Median residuals X,Y ~ 10., 14. mas

  6. ...Pudding: ULAS 0034 • Discovery 10/2005 • Obs 12/2006–9/2008 • Distance ~14pc (75mas)‏ • Error ~10% • Centroiding errors high

  7. Future + Problems • Biggest problem pilot successful !! • 5-10 Targets ready by mid 2009 • Follow-up of other objects in WFCAM field • Full program ~30 targets (15h/semester)‏ • Parallax factor coverage • Scheduling manually • 3 year future needed • Elsewhere: CHFT, Cala Alto, TNG

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