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We present CFHT photometry and IRTF spectroscopy of low-mass candidatemembers of Serpens South and Serpens Core ($\sim$430 pc, $\sim$0.5 Myr),identified using a novel combination of photometric filters, known as theW-band method. We report SC182952+011618, SS182959-020335 and SS183032-021028as young, low-mass Serpens candidate members, with spectral types in the rangeM7-M8, M5-L0 and M5-M6.5 respectively. Best-fit effective temperatures andluminosities imply masses of $<$ 0.12M$_{\odot}$ for all three candidatecluster members. We also present Hubble Space Telescope imaging data (F127M,F139M and F850LP) for six targets in Serpens South. We report the discovery ofthe binary system SS183044-020918AB. The binary components are separated by$\approx$45 AU, with spectral types of M7-M8 and M8-M9, and masses of 0.08-0.1and 0.05-0.07M$_{\odot}$. We discuss the effects of high dust attenuation onthe reliability of our analysis, as well as the presence of reddened backgroundstars in our photometric sample.

A Novel Survey for Young Substellar Objects with the W-band filter III: Searching for very low mass brown dwarfs in Serpens South and Serpens Core