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Recently, controversy has erupted over whether gas-rich spiral-spiral mergersare capable of forming {\it m$^{*}$} ellipticals. Measurements of$\sigma$$_{\circ}$ from the 2.29$\micron$ CO band-head for local LIRG/ULIRGs,suggest they are not. IR-bright mergers are often cited as the best candidatesfor forming massive ellipticals, so the recent observations have raised doubtsabout both the Toomre Merger Hypothesis and the fundamental assumptions of$\Lambda$-CDM galaxy formation models. However, kinematics obtained with theCalcium II Triplet at 8500 {\AA} suggest mergers are forming {\it m} $\ge$ {\itm$^{*}$} ellipticals. In this work, we show that kinematics derived from the COstellar absorption band-head leads to a significant underestimation of themasses of LIRGs/ULIRGs. This is primarily due to the presence of a youngpopulation affecting CO band-head measurements.

A Dynamical Miss: A Study of the Discrepancy Between Optical and Infrared Kinematics in Mergers