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We study the stellar population properties of the IRAC-detected $6 \lesssim z\lesssim 10$ galaxy candidates from the Spitzer UltRa Faint SUrvey Program(SURFS UP). Using the Lyman Break selection technique, we find a total of 16new galaxy candidates at $6 \lesssim z \lesssim 10$ with $S/N \geq 3$ in atleast one of the IRAC $3.6\mu$m and $4.5\mu$m bands. According to the best massmodels available for the surveyed galaxy clusters, these IRAC-detected galaxycandidates are magnified by factors of $\sim 1.2$--$5.5$. We find that theIRAC-detected $6 \lesssim z \lesssim 10$ sample is likely not a homogeneousgalaxy population: some are relatively massive (stellar mass as high as $4\times 10^9\,M_{\odot}$) and evolved (age $\lesssim 500$ Myr) galaxies, whileothers are less massive ($M_{\text{stellar}}\sim 10^8\,M_{\odot}$) and veryyoung ($\sim 10$ Myr) galaxies with strong nebular emission lines that boosttheir rest-frame optical fluxes. We identify two Ly$\alpha$ emitters in oursample from the Keck DEIMOS spectra, one at $z_{\text{Ly}\alpha}=6.76$ (inRXJ1347) and one at $z_{\text{Ly}\alpha}=6.32$ (in MACS0454). We show that IRAC$[3.6]-[4.5]$ color, when combined with photometric redshift, can be used toidentify galaxies likely with strong nebular emission lines within certainredshift windows.

Spitzer UltRa Faint SUrvey Program (SURFS UP). II. IRAC-Detected Lyman-Break Galaxies at 6 < z < 10 Behind Strong-Lensing Clusters