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38	38	This would be a lower limit as the flux is assumed to not be attenuated
39	39
40		== Non-Optically thick ==
	40	== Non-Optically thin ==
41	41
42	42	Now the planet is supplying a torus with bound material at a rate $\dot M$. The delta v required to liberate that material is of order $\sqrt{\frac{GM_*}{a}}$. We therefore need the star to impart momentum to the torus fast enough to liberate material at the same rate it enters. Setting the rate of momentum injection possible from the stellar lyman alpha flux, to the momentum injection rate needed to liberate material at the same rate it is injected gives