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Given its relative proximity (~430 pc), compact size (< 20'), young age (~0.5 Myr) and rich number of young stellar objects, the Serpens-South starforming region is a promising site for studying young sub-stellar objects, yetthe low-mass members of this region remain largely undiscovered. In this paperwe report on a deep photometric survey using a custom 1.45 um filter (W-band),as well as standard J and H near-IR filters, in order to identify candidatelow-mass young brown-dwarfs in the Serpens-South region. We constructed areddening-insensitive index (Q) by combining J, H and W-band photometry forsurvey objects, in order to identify candidate low-mass members of Serpensbased on the strength of the water absorption feature at 1.45 um in theatmospheres of mid-M and later objects. We then conducted spectroscopic followup to confirm youth and spectral type for our candidates. This is the firstsurvey to identify the very low-mass and coolest members of Serpens-South. Weidentify 4 low-mass candidate Serpens members, which all display IR excessemission, indicating the likely presence of circumstellar disks around them.One of the four candidate low-mass members in our list, SERP182918-020245,exhibits Pa_beta and Br_gamma emission features, confirming its youth andongoing magnetospheric accretion. Our new candidate members have spectral types>M4 and are the coolest and lowest mass candidate members yet identified inSerpens-South.

A Novel Survey for Young Substellar Objects with the W-band filter II. The Coolest and Lowest Mass Members of the Serpens-South Star-forming Region