ULAS J133553.45+113005.2

ULAS J133553.45+113005.2

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Virgo
Right ascension	13^h 35^m 53.45^s[1]
Declination	+11° 30′ 05.2″[1]
Characteristics
Spectral type	T9[1]
Astrometry
Distance	26–40[2] ly (8–12[2] pc)
Details
Mass	0.014–0.030[2] M☉
Temperature	500–550[3] K
Age	(0.6–5.3)×10^9 [2] years
Database references
SIMBAD	data

ULAS J133553.45+113005.2 (also called ULAS1335) is a T-type brown dwarf in the constellation of Virgo.^[1] It was discovered in data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Its discovery was reported June 2008.^[2]

After identification, ULAS1335 was imaged using the UFTI camera on the UKIRT, on Mauna Kea, Hawaii, to confirm its photometric properties and location. It was spectroscopically confirmed as a T9 dwarf using the Gemini North telescope, also at Mauna Kea, and was imaged using IRAC on the Spitzer Space Telescope. The IRAC imaging confirmed it as the reddest (in near-to-mid infrared colors) T dwarf yet discovered, and by inference the coolest.^[2]

ULAS1334 was initially estimated to have a temperature around 550–600 K, a distance of 8–12 parsecs (26–40 light years), and a mass of 15–31 Jupiter masses.^[2] More recent spectroscopic observations, using IRS on the Spitzer Space Telescope, give an effective temperature of 500–550 K.^[3] Since these temperature estimates are based on model comparisons, they should be treated with caution until the parallax of this object has been measured.^[2]

References

1. ULAS J133553.45+113005.2 -- Brown Dwarf (M<0.08solMass), database entry, SIMBAD. Accessed on line June 24, 2009.
2. Exploring the substellar temperature regime down to ~550K, Ben Burningham et al., Monthly Notices of the Royal Astronomical Society 391, #1 (November 2008), pp. 320–333, doi:10.1111/j.1365-2966.2008.13885.x, Bibcode: 2008MNRAS.391..320B. The arXiv e-print of this paper, arXiv:0806.0067, was first submitted June 2, 2008.
3. The Physical Properties of Four ~600 K T Dwarfs, S. K. Leggett et al., The Astrophysical Journal 695, #2 (April 2009), pp. 1517–1526, doi:10.1088/0004-637X/695/2/1517, Bibcode: 2009ApJ...695.1517L.