Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..527b&link_type=abstract
Spitzer Proposal ID #527
Physics
Scientific paper
We have discovered the first T8+ dwarf in a benchmark system. ULAS J2146-0010 has a spectral type of T8.5, and is a confirmed common proper motion binary companion with the M4 dwarf LHS3708. This object already has a well measured parallax and we have been able to place age and metallicity constraints on the pair. With an absolute J band magnitude of 17.68, this object is clearly extremely cool, and we have already estimated that Teff ~ 600K. We are requesting 7.7 hours of Spitzer Director's discretionary time to obtain IRAC imaging and IRS spectroscopy of this exciting object. These data will accurately constrain the mid-IR flux of the T8+, and combined with our NIR JHK spectroscopy and photometry, allow the bolometric flux of the object to be accurately determined. The parallax distance of the binary (12.5pc measured for the primary M4 star) will then directly give the luminosity of the T8+, and the age and metallicity constraints for the system (3.5-6 Gyr and -0.06 dex respectively, from measurements of the primary) will then combine to give the radius and mass of the T8+. A robust Teff will then come directly from the luminosity and radius constraints, providing a comprehensive set of physical properties for this benchmark object, and offering an unprecedented testbed for atmosphere models in the newly explored <700K temperature regime.
Burningham Ben
Homeier Derek
Leggett Sandy
Lucas Phillip
Pinfield Dž. D.
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