Interpretation and Parameterization of Extremely Red COOL dwarfs

Interpretation and Parameterization of Extremely Red COOL dwarfs IPERCOOL OATo: Osservatorio Astronomico di Torino CAR/UH: Center For Astrophysics Research, University of Hertfordshire SHAO: Shanghai Astronomical Observatory ON/MCT: National Brazilian Observatory,

Brown Dwarfs Masses 70 to current 12 Jupiter l Go from M 8 to T dwarf l 2000 K to current 500 K l Very complex atmospheres l Can be as old as the galaxy l Very faint very red Galaxy to exo-planets l

Brown Dwarfs Hump in the H-R diagram (Tinney 2003)

Brown Dwarfs Three near-IR L 7 dwarfs In the mid-IR. (Kirkpatrick et al 2008)

Brown Dwarfs Models of L/T dwarfs with current calibrators. (Burrows 2007)

IPERCOOL l Parameters: l l l Spectroscopy CAR/UH, SHAO Photometry CAR/UH, ON/MCT Astrometry OATo, SHAO, ON/MCT Radial Velocities CAR/UH, ? ? Interpretation l l Searching for Binaries/ CPMs OATo, ON/MCT Testing Models OATo Initial Mass function CAR/UH Application to the Galaxy CAR/UH, SHAO

IMF very sensative to low mass objects (Burgasser 2004)

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

Spectroscopic Parallax Relation

L/T Dwarf parallaxes

. . . Pudding: ULAS 0034 l l l Discovery 10/2005 Obs 12/2006– 7/2009 Distance ~14 pc (75 mas) Error ~10% Centroiding errors high

. . . Pudding: Binary Systems L 0 / M 3 Binary l Spectra ISAAC l RV, log g. . . l Distance ~27 pc l Benchmarks l

IPERCOOL PARSEC -> 2012 OATo Exchange Chinese Academy of Science -> 2010 SHAO MYSQL DB Royal Society -> 2010 CAR/UH WWW Interface ON/MCT + Observations ESO 2. 2 / NTT

WP n° Work package title Beneficiary / Partner Start month 0 Kickoff meeting OATo 01/10 1 Parallax, Proper Motion and Photometric Pipeline development ON/MCT - OATo 2 Spectroscopic procedures and pipelines, applciations for followup time 3 Development for Database management and WWW access to observations and results 4 Signals and solutions of Binary systems 5 End month 01/10 06/10 SHAO - UH 01/10 06/10 SHAO - OATo 07/10 06/10 ON/MCT - OATo 01/11 06/11 OATo - ON/MCT 09/11 03/12 Common proper motion and peculiar objects OATo - ON/MCT 06/11 12/11 6 Photometric Identification of peculiar objects UH - ON/MCT 06/11 12/11 7 Parameters: Parallaxes, magnitudes and proper motions OATo – SHAO 01/12 06/12 8 Parameters: Spectra reductions UH - SHAO 06/12 12/12 9 Parameters: Catalog/Database finalization, Planning for final year OATo + UH ON/MCT 09/12 12/12 0 Final year preparation meeting UH 01/13 10 Interpretation: Calibrations and Models ON/MCT - UH 01/13 12/13 11 Interpretation: Galaxy SHAO - UH 01/13 06/13 12 Interpretation: IMF UH - SHAO 07/13 12/13 SHAO - OATo