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<abridged> The large relative sizes of circumstellar and circumplanetarydisks imply that they might be seen in eclipse in stellar light curves. Weestimate that a survey of ~10^4 young (~10 Myr old) post-accretion pre-MS starsmonitored for ~10 years should yield at least a few deep eclipses fromcircumplanetary disks and disks surrounding low mass companion stars. Wepresent photometric and spectroscopic data for a pre-MS K5 star (1SWASPJ140747.93-394542.6), a newly discovered ~0.9 Msun member of the ~16 Myr-oldUpper Cen-Lup subgroup of Sco-Cen at a kinematic distance of 128 pc. SuperWASPand ASAS light curves for this star show a remarkably long, deep, and complexeclipse event centered on 29 April 2007. At least 5 multi-day dimming events of>0.5 mag are identified, with a >3.3 mag deep eclipse bracketed by two pairs of~1 mag eclipses symmetrically occurring +-12 days and +-26 days before andafter. Hence, significant dimming of the star was taking place on and off overat least a ~54 day period in 2007, and a strong >1 mag dimming event occurredover a ~12 day span. We place a firm lower limit on the period of 850 days(i.e. the orbital radius of the eclipser must be >1.7 AU and orbital velocitymust be <22 km/s). The shape of the light curve is similar to the lop-sidedeclipses of the Be star EE Cep. We suspect that this new star is being eclipsedby a low-mass object orbited by a dense inner disk, girded by at least 3 dustyrings of lower optical depth. Between these rings are at least two annuli ofnear-zero optical depth (i.e. gaps), possibly cleared out by planets or moons,depending on the nature of the secondary. For possible periods in the range2.33-200 yr, the estimated total ring mass is ~8-0.4 Mmoon (if the rings haveoptical opacity similar to Saturn's rings), and the edge of the outermostdetected ring has orbital radius ~0.4-0.09 AU.

the astronomical journal

Planetary Construction Zones in Occultation: Discovery of an Extrasolar  Ring System Transiting a Young Sun-like Star and Future Prospects for  Detecting Eclipses by Circumsecondary and Circumplanetary Disks