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Direct imaging surveys have discovered wide-orbit planetary-mass companionsthat challenge existing models of both star and planet formation, but theirdemographics remain poorly sampled. We have developed an automated binarycompanion point spread function (PSF) fitting pipeline to take advantage ofSpitzer's infrared sensitivity to planetary-mass objects and circum(sub)stellardisks, measuring photometry across the four IRAC channels of 3.6 $\mu$m, 4.5$\mu$m, 5.8 $\mu$m, and 8.0 $\mu$m. We present PSF-fitting photometry ofarchival Spitzer/IRAC images for 11 young, low-mass ($M\sim0.044$-0.88$M_{\odot}$; M7.5-K3.5) members of three nearby star-forming regions(Chameleon, Taurus, and Upper Scorpius; $d\sim$ 150 pc; $\tau\sim$ 1-10 Myr)that host confirmed or candidate faint companions at $\rho =1.68^{\prime\prime}-7.31^{\prime\prime}$. We recover all system primaries, sixconfirmed, and two candidate low-mass companions in our sample. We also measurenon-photospheric $[3.6]-[8.0]$ colors for three of the system primaries, fourof the confirmed companions, and one candidate companion, signifying thepresence of circumstellar or circum(sub)stellar disks. We furthermore reportthe confirmation of a $\rho=4.66^{\prime\prime}$ (540 au) companion to [SCH06]J0359+2009 which was previously identified as a candidate via imaging over fiveyears ago, but was not studied further. Based on its brightness($M_{[3.6]}=8.53$ mag), we infer the companion mass to be $M=20\pm5$$M_\mathrm{Jup}$ given the primary's model-derived age of 10 Myr. Our frameworkis sensitive to companions with masses less than 10 $M_\mathrm{Jup}$ atseparations of $\rho = 300$ au in nearby star-forming regions, opening up a newregime of parameter space that has yet to be studied in detail, discoveringplanetary-mass companions in their birth environments and revealing theircircum(sub)stellar disks.

Searching for Wide Companions and Identifying Circum(sub)stellar Disks through PSF-Fitting of Spitzer/IRAC Archival Images