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We present the first in a series of papers in T$h$e role of $E$nvironment inshaping $L$ow-mass $E$arly-type $N$earby g$a$laxies (hELENa) project. In thispaper we combine our sample of 20 low-mass early types (dEs) with 258 massiveearly types (ETGs) from the ATLAS$^{\mathrm{3D}}$ survey - all observed withthe SAURON integral field unit (IFU) - to investigate early-type galaxies'stellar population scaling relations and the dependence of the populationproperties on local environment, extended to the low-{\sigma} regime of dEs.The ages in our sample show more scatter at lower {\sigma} values, indicativeof less massive galaxies being affected by the environment to a higher degree.The shape of the age-{\sigma} relation for cluster vs. non-cluster galaxiessuggests that cluster environment speeds up the placing of galaxies on the redsequence. While the scaling relations are tighter for cluster than for thefield/group objects, we find no evidence for a difference in average populationcharacteristics of the two samples. We investigate the properties of our samplein the Virgo cluster as a function of number density (rather than simpleclustrocentric distance) and find that dE ages negatively correlate with thelocal density, likely because galaxies in regions of lower density are laterarrivals to the cluster or have experienced less pre-processing in groups, andconsequently used up their gas reservoir more recently. Overall, dE propertiescorrelate more strongly with density than those of massive ETGs, which wasexpected as less massive galaxies are more susceptible to external influences.

The hELENa project - I. Stellar populations of early-type galaxies linked with local environment and galaxy mass