  We present new observations of the edge-on debris disk around HD 15115 (F
star at 48.2 pc) obtained in the near-IR. We search for observational evidence
for a second inner planetesimal ring in the system. We obtained total intensity
and polarimetric data in the broad bands J and H and processed the data with
differential imaging techniques achieving an angular resolution of about 40
mas. We observe an axisymmetric planetesimal belt with a radius of $\sim$2$''$,
an inclination of $85.8^{\circ} \pm 0.7^{\circ}$ and position angle of
278.9$^{\circ} \pm 0.1^{\circ}$. A grid of models describing the spatial
distribution of the grains in the disk is generated to constrain the geometric
parameters of the disk and to explore the presence of a second belt. We perform
a photometric analysis of the data and compare disk brightness in two bands in
scattered and in polarized light. The analysis shows that the west side is
$\sim$2.5 times brighter in total intensity than the east side in both bands,
while for polarized light in the J band this ratio is only 1.25. The maximum
polarization fraction is 15--20% at $r\sim$2.5$''$. We also find that the J - H
color of the disk appears to be red for the radial separations $r\lesssim2''$
and is getting bluer for the larger separations. This apparent change of disk
color from red to blue with an increasing radial separation could be explained
by the decreasing average grain size with distance. The presence of an
additional inner belt slightly inclined with respect to the main planetesimal
belt is suspected from the polarized intensity image but the analysis and
modeling presented here cannot establish a firm conclusion due to the faintness
of the disk and its high inclination.
