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The light curve of 1SWASP J140747.93-394542.6, a $\sim$16 Myr old star in theSco-Cen OB association, underwent a complex series of deep eclipses that lasted56 days, centered on April 2007. This light curve is interpreted as the transitof a giant ring system that is filling up a fraction of the Hill sphere of anunseen secondary companion, J1407b. We fit the light curve with a model of anazimuthally symmetric ring system, including spatial scales down to thetemporal limit set by the star's diameter and relative velocity. The best ringmodel has 37 rings and extends out to a radius of 0.6 AU (90 million km), andthe rings have an estimated total mass on the order of $100 M_{Moon}$. The ringsystem has one clearly defined gap at 0.4 AU (61 million km), which wehypothesize is being cleared out by a $< 0.8 M_{\oplus}$ exosatellite orbitingaround J1407b. This eclipse and model implies that we are seeing acircumplanetary disk undergoing a dynamic transition to anexosatellite-sculpted ring structure and is one of the first seen outside ourSolar system.

Modeling giant extrasolar ring systems in eclipse and the case of J1407b: sculpting by exomoons?