  We consider Smoluchowski's coagulation equation with kernels of homogeneity
one of the form $K_{\varepsilon }(\xi,\eta) =\big( \xi^{1-\varepsilon
}+\eta^{1-\varepsilon }\big)\big ( \xi\eta\big) ^{\frac{\varepsilon }{2}}$.
Heuristically, in suitable exponential variables, one can argue that in this
case the long-time behaviour of solutions is similar to the inviscid Burgers
equation and that for Riemann data solutions converge to a traveling wave for
large times. Numerical simulations in \cite{HNV16} indeed support this
conjecture, but also reveal that the traveling waves are oscillatory and the
oscillations become stronger with smaller $\varepsilon$. The goal of this paper
is to construct such oscillatory traveling wave solutions and provide details
of their shape via formal matched asymptotic expansions.
