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We report our multi-band infrared (IR) imaging of the transitionalmillisecond pulsar system J1023+0038, a rare pulsar binary known to have anaccretion disk in 2000--2001. The observations were carried out withground-based and space telescopes from near-IR to far-IR wavelengths. Wedetected the source in near-IR JH bands and Spitzer 3.6 and 4.5 $\mu$m mid-IRchannels. Combined with the previously-reported optical spectrum of the source,the IR emission is found to arise from the companion star, with no excessemission detected in the wavelength range. Because our near-IR fluxes arenearly equal to those obtained by the 2MASS all-sky survey in 2000 Feb., theresult indicates that the binary did not contain the accretion disk at thetime, whose existence would have raised the near-IR fluxes to 2-times largervalues. Our observations have thus established the short-term nature of theinteracting phase seen in 2000--2001: the accretion disk at most existed for2.5 yrs. The binary was not detected by the WISE all-sky survey carried out in2010 at its 12 and 22 $\mu$m bands and our Herschel far-IR imaging at 70 and160 $\mu$m. Depending on the assumed properties of the dust, the resulting fluxupper limits provide a constraint of <3x10^{22}--3x10^{25} g on the mass of thedust grains that possibly exist as the remnant of the previously-seen accretiondisk.

Infrared Observations of The Millisecond Pulsar Binary J1023+0038: Evidence for Short-Term Nature of Its Interacting Phase in 2000--2001