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We analyse the environmental properties of 370 local early-type galaxies(ETGs) in the MASSIVE and ATLAS3D surveys, two complementary volume-limitedintegral-field spectroscopic (IFS) galaxy surveys spanning absolute $K$-bandmagnitude $-21.5 > M_K > -26.6$, or stellar mass $8 \times 10^{9} < M_* < 2\times 10^{12} M_\odot$. We find these galaxies to reside in a diverse range ofenvironments measured by four methods: group membership (whether a galaxy is abrightest group/cluster galaxy, satellite, or isolated), halo mass, large-scalemass density (measured over a few Mpc), and local mass density (measured withinthe $N$th neighbour). The spatially resolved IFS stellar kinematics providerobust measurements of the spin parameter $\lambda_e$ and enable us to examinethe relationship among $\lambda_e$, $M_*$, and galaxy environment. We find astrong correlation between $\lambda_e$ and $M_*$, where the average $\lambda_e$decreases from $\sim 0.4$ to below 0.1 with increasing mass, and the fractionof slow rotators $f_{\rm slow}$ increases from $\sim 10$% to 90%. We show forthe first time that at fixed $M_*$, there are almost no trends between galaxyspin and environment; the apparent kinematic morphology-density relation forETGs is therefore primarily driven by $M_*$ and is accounted for by the jointcorrelations between $M_*$ and spin, and between $M_*$ and environment. Apossible exception is that the increased $f_{\rm slow}$ at high local densityis slightly more than expected based only on these joint correlations. Ourresults suggest that the physical processes responsible for building up thepresent-day stellar masses of massive galaxies are also very efficient atreducing their spin, in any environment.

The MASSIVE Survey - VII. The Relationship of Angular Momentum, Stellar Mass and Environment of Early-Type Galaxies