KPNO-Tau 12 (also called 2MASS J0419012+280248) is a low-mass brown dwarf or free-floating planetary-mass object that is surrounded by a protoplanetary disk, actively accreting material from it.

[6] KPNO-Tau 12 was identified in 2003 in data from a survey of the Taurus Molecular Clouds taken with a telescope at the Kitt Peak National Observatory (KPNO) and 2MASS.

It also showed helium (He I) and calcium (Ca II IR triplet) emission in the Keck spectrum, which are usually seen in stars that undergo intense accretion of material from a surrounding protoplanetary disk.

[6] Additionally a Keck infrared spectrum shows a prominent emission line (see figure 10 of their work), which is described as Paschen β at 1.28 μm in the appendix of the paper.

These two works first identified infrared excess around KPNO-Tau 12 and classified it as a class II disk.