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[abridged] We study the dependence of the galaxy size evolution onmorphology, stellar mass and large scale environment for a sample of 298 groupand 384 field quiescent early-type galaxies from the COSMOS survey, selectedfrom z~1 to the present, and with masses $log(M/M_\odot)>10.5$.  The galaxy size growth depends on galaxy mass and early-type galaxymorphology, e.g., elliptical galaxies evolve differently than lenticulargalaxies. At the low mass end -$10.5<Log(M/M_\odot)<11$, ellipticals do notshow strong size growth from $z\sim1$ to the present (10% to 30% depending onthe morphological classification). On the other end, massive ellipticals-log(M/M_\odot)>11.2$- approximately doubled their size. Interestingly,lenticular galaxies display different behavior: they appear more compact onaverage and they do show a size growth of \sim60% since z=1 independent ofstellar mass. We compare our results with state-of-the art semi-analyticmodels.  While major and minor mergers can account for most of the galaxy size growth,we find that with present data and the theoretical uncertainties in themodeling we cannot state clear evidence favoring either merger or mass loss viaquasar and/or stellar winds as the primary mechanism driving the evolution.  The galaxy mass--size relation and the size growth do not depend onenvironment in the halo mass range explored in this work (field to group mass$log(M_h/M_\odot)<14$), i.e., group and field galaxies follow the same trends,which is at variance with predictions from current hierarchical models thatshow a clear dependence of size growth on halo mass for massive ellipticals-$log(M_*/M_\odot)>11.2$.

monthly notices of the royal astronomical society

The evolution of the mass-size relation for early type galaxies from z~1  to the present: dependence on environment, mass-range and detailed morphology