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We study 10 spectroscopically confirmed Ly$\alpha$ emitters (LAEs) at$z\approx3.1$ in the UDS field, covered by JWST/NIRCam in the PRIMER program.All LAEs are detected in all NIRCam bands from F090W to F444W, corresponding torestframe 2200\AA--1.2$\mathrm{\mu m}$. Based on morphological analysis of theF200W images, three out of the 10 targets are resolved into pair-like systemswith separations of $<0.9''$, and another three show asymmetric structures. Wethen construct the spectral energy distributions (SEDs) of these LAEs. Allsources, including the pairs, show similar SED shapes, with a prominent fluxexcess in the F200W band, corresponding to extremely strong [O III]+H$\beta$emission lines (${\rm EW_{rest}}=740$--$6500\,$\AA). The median effectiveradii, stellar mass, and UV slope of our sample are 0.36$\,$kpc,$3.8\times10^7\,M_\odot$, and --2.48, respectively. The average burst age,estimated by stellar mass over star formation rate, is $<40\,$Myr. Thesemeasurements reveal an intriguing starbursting dwarf galaxy population lyingoff the extrapolations of the $z \sim 3$ scaling relations to the low-mass end:$\sim 0.7$ dex above the star-forming main sequence, $\sim 0.35$ dex below themass--size relation, and bluer in the UV slope than typical high-z galaxies atsimilar UV luminosities. We speculate that these numbers may require a largermain sequence scatter or tail in the dwarf galaxy regime towards the starburstoutliers.

A Close Look at Ly$\alpha$ Emitters with JWST/NIRCam at $z\approx3.1$