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Jeremiah added section_Free_flow_thoughts_begin__.tex
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\section{Free flow thoughts}
\begin{itemize}
\item Mass-loss is an important process in stellar evolution, especially for massive stars.
\item It can determine the fate of a massive star: very little mass loss, and the star will explode as a red supergiant producing a SN II-P, but with significant mass-loss the hydrogen and even helium layers may be stripped producing a SN Ic.
\item Despite its importance we know very little about mass-loss.
\item Radiation driven winds certainly play a role, but they are not enough to explain the prevalence of stripped cores.
\item Binary evolution may play a role, but the theory is not certain enough to predict mass-loss with reliability
\item Complicating the picture even further,
\item A record of the star's mass-loss history is imprinted in the circumstellar medium. If one knew the density profile and velocity profile of the CSM, then one can straightforwardly infer the mass-loss history.
\item Once the star explodes, the supernova shock quickly overtakes the pre-explosion ejecta, emitting synchrotron emission along the way. The variability in the synchrotron emission reflects the variability in the CSM density profile. Therefore, the shock acts as a CAT scan of the CSM, thereby providing the mass-loss history of the star.
\end{itemize}
