Mathematics – Logic
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop12044e&link_type=abstract
HST Proposal ID #12044. Cycle 17
Mathematics
Logic
Scientific paper
We request DD observations of the SDWFS J1433+35, which is a strong candidate for the coldest brown dwarf yet discovered and the first example of the elusive "Y-dwarf" spectral class. This source was discovered from a deep, wide-field survey of 10 square degrees with the IRAC instrument on Spitzer, and is redder in both [3.6]-[4.5] and H-[4.5] than any published brown dwarfs. The spectrum falls beyond 5 microns, strongly implying that the red mid-infrared colors are due to methane absorption in the IRAC 3.6 micron channel rather than dust obscuration. The source is undetected in deep, ground-based near-IR images, with a H>24.2 {Vega} limit derived from Keck AO imaging. The proposed WFC3 imaging should provide detections in two near-infrared bands. By showing the target is morphologically unresolved and that it has the non-uniform spectral energy distribution of an ultracool brown dwarf, the proposed observations will definitely show that {i} SDWFS J1433+35 is the coldest brown dwarf known, {ii} test models of ultracool, planet-like, brown dwarf atmospheres, and {iii} refine predictions and strategies for the Wide-Field Infrared Survey Explorer {WISE; planned to launch this December}.;
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