  We present near-infrared (IR) spectra of two planetary nebula (PN) candidates
in close lines of sight toward the Galactic center (GC) using GNIRS at Gemini
North. High-resolution images from radio continuum and narrow-band IR
observations reveal ring-like morphologies of these objects, and their mid-IR
spectra from the Spitzer Space Telescope exhibit rich emission lines from
highly excited species such as [S IV], [Ne III], [Ne V], and [O IV]. We also
derive elemental abundances using the Cloudy synthetic models, and find an
excess amount of the s-process element Krypton in both targets, which supports
their nature as PNe. We estimate foreground extinction toward each object using
near-IR hydrogen recombination lines, and find significant visual extinctions
($A_V > 20$). The distances inferred from the size versus surface brightness
relation of other PNe are $9.0\pm1.6$ kpc and $7.6\pm1.6$ kpc for SSTGC 580183
and SSTGC 588220, respectively. These observed properties along with abundance
patterns and their close proximity to Sgr A$^*$ (projected distances $<20$ pc)
make it highly probable that these objects are the first confirmed PNe objects
in the nuclear stellar disk. The apparent scarcity of such objects resembles
the extremely low rate of PN formation in old stellar systems, but is in line
with the current rate of the sustained star formation activity in the Central
Molecular Zone.
