Other
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop..551m&link_type=abstract
Spitzer Proposal ID #551
Other
Scientific paper
We have recently discovered an object with the Wide-field Infrared Survey Explorer with colors that suggest that it could be the coldest brown dwarf discovered to date. This object, dubbed Lyra1, could be the first representative of an entirely new spectral class (the so-called Y dwarfs). If the object is as cold as its WISE colors indicate, we may have at last found the final link between low mass stars and the giant planets in our own solar system. To date, we have discovered and spectroscopically confirmed over a dozen new ultra-cool brown dwarfs drawn from the WISE dataset, proving that WISE is an excellent tool for identifying these objects and lending confidence to our detection of Lyra1. This object is detected to 25 sigma at 4.6 um, but it is undetected in the other three WISE bandpasses (3.6, 12 and 22 um). The 2.5 sigma lower limit of its [3.4]-[4.6] color is 4.3 magnitudes, making it over a magnitude redder than the reddest spectroscopically confirmed brown dwarfs presently known. We propose to use the 20 times better sensitivity of Spitzer to detect the object at 3.6 um, even if it is as cold as 250 K, allowing us to better determine the object's effective temperature. We also propose to observe it at 4.5 um to begin to determine if it has measurable parallax and proper motion.
Cushing Michael
Eisenhardt Peter
Gelino Chris
Kirkpatrick Davy
Mainzer Amanda
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