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In this letter we describe how we use stellar dynamics information toconstrain the shape of the stellar IMF in a sample of 27 early-type galaxiesfrom the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios,$\Upsilon_\mathrm{dyn}$ and $\Upsilon_{\ast}$, over a homogenous aperture of0.5~$R_{e}$. We use the constraint $\Upsilon_\mathrm{dyn} \ge \Upsilon_{\ast}$to test two IMF shapes within the framework of the extended MILES stellarpopulation models. We rule out a single power law IMF shape for 75% of thegalaxies in our sample. Conversely, we find that a double power law IMF shapewith a varying high-mass end slope is compatible (within 1$\sigma$) with 95% ofthe galaxies. We also show that dynamical and stellar IMF mismatch factors giveconsistent results for the systematic variation of the IMF in these galaxies.

IMF shape constraints from stellar populations and dynamics from CALIFA