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We have conducted a search of a 9 deg$^{2}$ region of the CFHTLS around theMilky Way analog M101 (D$\sim$7 Mpc), in order to look for previously unknownlow surface brightness galaxies. This search has uncovered 38 new low surfacebrightness dwarf candidates, and confirmed 11 previously reported galaxies, allwith central surface brightness $\mu$(g,0)$>$23mag/arcsec$^{2}$, potentiallyextending the satellite luminosity function for the M101 group by $\sim$1.2magnitudes. The search was conducted using an algorithm that nearly automatesthe detection of diffuse dwarf galaxies. The candidates small size and lowsurface brightness means that the faintest of these objects would likely bemissed by traditional visual or computer detection techniques. The dwarf galaxycandidates span a range of $-$7.1 $\geq$ M$_g$ $\geq$ $-$10.2 and half lightradii of 118-540 pc at the distance of M101, and they are well fit by simpleS\'{e}rsic surface brightness profiles. These properties are consistent withdwarfs in the Local Group, and to match the Local Group luminosity function$\sim$10-20 of these candidates should be satellites of M101. Association witha massive host is supported by the lack of detected star formation and the overdensity of candidates around M101 compared to the field. The spatialdistribution of the dwarf candidates is highly asymmetric, and concentrated tothe northeast of M101 and therefore distance measurements will be required todetermine if these are genuine members of the M101 group.

Discovery of diffuse dwarf galaxy candidates around M101