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We characterize the photometric and kinematic properties of simulatedearly-type galaxy (ETG) stellar halos, and compare them to observations. Weselect a sample of ~1200 ETGs in the TNG100 and TNG50 simulations, spanning astellar mass range of $10^{10.3}-10^{12}M_{\odot}$ and within the range of(g-r) colour and lambda-ellipticity diagram populated by observed ETGs. Wedetermine photometric parameters, intrinsic shapes, and kinematic observablesin their extended stellar halos. We study the variation in kinematics fromcenter to halo and connect it to a change in the intrinsic shape of thegalaxies. We find that the simulated galaxy sample reproduces the diversity ofkinematic properties observed in ETG halos. Simulated fast rotators (FRs)divide almost evenly in one third having flat lambda profiles and high halorotational support, a third with gently decreasing profiles, and another thirdwith low halo rotation. Slow rotators (SRs) tend to have increased rotation inthe outskirts, with half of them exceeding lambda=0.2. For$M_{*}>10^{11.5}M_{\odot}$ halo rotation is unimportant. A similar variety ofproperties is found for the stellar halo intrinsic shapes. Rotational supportand shape are deeply related: the kinematic transition to lower rotationalsupport is accompanied by a change towards rounder intrinsic shape. Triaxialityin the halos of FRs increases outwards and with stellar mass. Simulated SRshave relatively constant triaxiality profiles. Simulated stellar halos show alarge variety of structural properties, with quantitative but no clearqualitative differences between FRs and SRs. At the same stellar mass, stellarhalo properties show a gradual transition and significant overlap between thetwo families, despite the clear bimodality in the central regions. This is inagreement with observations of extended photometry and kinematics. [abridged]

The stellar halos of ETGs in the IllustrisTNG simulations: the photometric and kinematic diversity of galaxies at large radii