Discovery of the Y1 Dwarf WISE J064723.23-623235.5
J. Davy Kirkpatrick, Michael C. Cushing, Christopher R. Gelino,, Charles A. Beichman, C. G. Tinney, Jacqueline K. Faherty, Adam Schneider, and, Gregory N. Mace

TL;DR
This paper reports the discovery and characterization of WISE J064723.23-623235.5, a nearby, very cold Y1 brown dwarf, using infrared data and spectroscopy, providing insights into its physical properties and potential group membership.
Contribution
It presents the identification and detailed analysis of a new Y1 brown dwarf, including its spectral classification, temperature, mass estimate, and possible association with a stellar moving group.
Findings
Spectral type Y1+/-0.5, one of the latest Y dwarfs classified.
Effective temperature estimated at 350-400K.
Possible membership in the Columba moving group, suggesting a very young age.
Abstract
We present the discovery of a very cold, very low mass, nearby brown dwarf using data from the NASA Wide-field Infrared Survey Explorer (WISE). The object, WISE J064723.23-623235.5, has a very red WISE color of W1-W2 > 3.77 mag and a very red Spitzer Space Telescope color of ch1-ch2 = 2.82+/-0.09 mag. In J_MKO-ch2 color (7.58+/-0.27 mag) it is one of the two or three reddest brown dwarfs known. Our grism spectrum from the Hubble Space Telescope (HST) confirms it to be the seventeenth Y dwarf discovered, and its spectral type of Y1+/-0.5 makes it one of the four latest-type Y dwarfs classified. Astrometric imaging from Spitzer and HST, combined with data from WISE, provides a preliminary parallax of pi = 115+/-12 mas (d = 8.7+/-0.9 pc) and proper motion of mu = 387+/-25 mas/yr based on 2.5 years of monitoring. The spectrum implies a blue J-H color, for which model atmosphere calculations…
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