  In our solar system, the presence of rings is exclusive to the gas giants,
but is this the case for all planetary systems? In principle, it seems that
rocky exoplanets could also have rings, which could be searched for by studying
their subtle imprint on the ingress and egress of transits. Unfortunately, such
effects are difficult to measure and require high precision photometric and/or
spectroscopic observations. At the most basic level though, the presence of
rings would result in an increased transit depth that could be mistaken as an
anonymously large radius. Motivated by this, I consider how a population of
exoplanets with rings would impact radius measurements, focusing on Earth-like
exoplanets. It is found that this population introduces an enhancement of
inferred radii in the range of $\sim2-3R_\oplus$, not unlike the sub-Neptunes
that have been identified in recent transit surveys. Whether rings can explain
all or most sub-Neptunes seems difficult, since it would require a large
fraction of rocky planets to have rings ($\gtrsim40\%$) and/or a factor of
$\sim2-3$ increase in the number of planets with radii $\lesssim1.2R_\oplus$.
Even if rings cannot explain all sub-Neptunes, this work suggests that focusing
on those planets currently classified as sub-Neptunes may be a good starting
place for finding rocky planets with rings.
