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We present the highest spatial resolution ALMA observations to date of theClass I protostar GY 91 in the $\rho$ Ophiuchus L1688 molecular cloud complex.Our 870 $\mu$m and 3 mm dust continuum maps show that the GY 91 disk has aradius of $\sim$80 AU, and an inclination of $\sim$40$^{\circ}$, but mostinterestingly that the disk has three dark lanes located at 10 AU, 40 AU, and70 AU. We model these features assuming they are gaps in the disk surfacedensity profile and find that their widths are 7 AU, 30 AU, and 10 AU. Thesegaps bear a striking resemblance to the gaps seen in the HL Tau disk,suggesting that there may be Saturn-mass planets hiding in the disk. Toconstrain the relative ages of GY 91 and HL Tau, we also model the disk andenvelope of HL Tau and find that they are of similar ages, although GY 91 maybe younger. Although snow lines and magnetic dead zones can also produce darklanes, if planets are indeed carving these gaps then Saturn-mass planets mustform within the first $\sim$0.5 Myr of the lifetime of protoplanetary disks.

Multiple Gaps in the Disk of the Class I Protostar GY 91