Sarah Casewell Methane imaging of Pleiades T Dwarfs

Sarah Casewell T dwarfs in the Pleiades Why T dwarfs? • Low mass end

Sarah Casewell Survey area Galactic Cluster Dwarfs

Sarah Casewell I, I-Z CMD candidates Blue: Selected objects Cyan: Known members Red: DUSTY

Sarah Casewell Z, Z-J CMD candidates Red: PM candidates Cyan: PM members Blue: DUSTY

Sarah Casewell H, J-H CMD candidates Red: DUSTY model Black: Next. Gen model Blue:

Sarah Casewell J, J-K CMD candidates Red: DUSTY model Black: Next. Gen model Blue:

Sarah Casewell Methane Imaging How does it work? Galactic Cluster Dwarfs

Sarah Casewell Negative results PLZJ 112 Galactic Cluster Dwarfs PLZJ 235 PLZJ 721

Sarah Casewell Colours Galactic Cluster Dwarfs

Sarah Casewell Conclusions • Used CFHT and UKIRT to discover 5 T dwarf candidates

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Sarah Casewell Methane imaging of Pleiades T Dwarfs Sarah Casewell Galactic Cluster Dwarfs

Sarah Casewell T dwarfs in the Pleiades Why T dwarfs? • Low mass end of star formation models • Atmosphere models L-T transition Why the Pleiades? • Best understood cluster in the night sky • Valid Lithium age for the cluster • Robust age for evolutionary models Galactic Cluster Dwarfs

Sarah Casewell Survey area Galactic Cluster Dwarfs

Sarah Casewell I, I-Z CMD candidates Blue: Selected objects Cyan: Known members Red: DUSTY model Black: Next. Gen model Galactic Cluster Dwarfs

Sarah Casewell Z, Z-J CMD candidates Red: PM candidates Cyan: PM members Blue: DUSTY model Black: Next. Gen model Galactic Cluster Dwarfs

Sarah Casewell H, J-H CMD candidates Red: DUSTY model Black: Next. Gen model Blue: Moraux members Green: Bihain members Late L Early to mid T Galactic Cluster Dwarfs

Sarah Casewell J, J-K CMD candidates Red: DUSTY model Black: Next. Gen model Blue: Moraux members Green: Bihain members Early T Galactic Cluster Dwarfs Late L

Sarah Casewell Methane Imaging How does it work? Galactic Cluster Dwarfs

Sarah Casewell Negative results PLZJ 112 Galactic Cluster Dwarfs PLZJ 235 PLZJ 721

Sarah Casewell Colours Galactic Cluster Dwarfs

Sarah Casewell Conclusions • Used CFHT and UKIRT to discover 5 T dwarf candidates • Methane images show 3 are not point sources • Used COND and CLR models and filters to generate tracks • COND are good for J-K, CLR for H-K • Pleiades objects are on L-T transition P. Dobbie, S. Hodgkin, E. Moraux, R. Jameson, N. Hambly, J. Irwin, N Lodieu. Galactic Cluster Dwarfs