Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite
  Mission
  As ever-more sensitive experiments are made in the quest for primordial CMB B
Modes, the number of potentially significant astrophysical contaminants becomes
larger as well. Thermal emission from interplanetary dust, for example, has
been detected by the Planck satellite. While the polarization fraction of this
Zodiacal, or interplanetary dust emission (IPDE) is expected to be low, it is
bright enough to be detected in total power. Here, estimates of the magnitude
of the effect as it might be seen by the LiteBIRD satellite are made. The COBE
IPDE model from Kelsall et al. (1998) is combined with a model of the LiteBIRD
experiment's scanning strategy to estimate potential contamination of the CMB
in both total power and in polarization power spectra. LiteBIRD should detect
IPDE in temperature across all of its bands, from 40 through 402 GHz, and
should improve limits on the polarization fraction of IPDE at the higher end of
this frequency range. If the polarization fraction of IPDE is of order 1%, the
current limit from ISO/CAM measurements in the mid-infrared, it may induce
large-scale polarization B Modes comparable to cosmological models with an r of
order 0.001. In this case, the polarized IPDE would also need to be modeled and
removed. As a CMB foreground, IPDE will always be subdominant to Galactic
emissions, though because it caused by emission from grains closer to us, it
appears variable as the Earth travels around the Sun, and may thereby
complicate the data analysis somewhat. But with an understanding of some of the
symmetries of the emission and some flexibility in the data processing, it
should not be the primary impediment to the CMB polarization measurement.
