The Carnegie Hubble Program: The Infrared Leavitt Law in IC 1613
  We have observed the dwarf galaxy IC 1613, at multiple epochs in the
mid--infrared using Spitzer and contemporaneously in the near--infrared using
the new FourStar near-IR camera on Magellan. We have constructed Cepheid
period--luminosity relations in the J, H, K_s, [3.6] and [4.5] bands and have
used the run of their apparent distance moduli as a function of wavelength to
derive the line--of--sight reddening and distance to IC1613. Using a nine--band
fit, we find E(B-V) = 0.05 +- 0.01 mag and an extinction--corrected distance
modulus of mu_{0} = 24.29 +- 0.03_{statistical} +- 0.03_{systematic} mag. By
comparing our multi--band and [3.6] distance moduli to results from the tip of
the red giant branch and red clump distance indicators, we find that
metallicity has no measurable effect on Cepheid distances at 3.6 microns in the
metallicity range -1.0 < [Fe/H] < 0.2, hence derivations of the Hubble constant
at this wavelength require no correction for metallicity.
