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We search for extrasolar planets around millisecond pulsars using pulsartiming data and seek to determine the minimum detectable planetary masses as afunction of orbital period. Using the 11-year data set from the North AmericanNanohertz Observatory for Gravitational Waves (NANOGrav), we look forvariations from our models of pulse arrival times due to the presence ofexoplanets. No planets are detected around the millisecond pulsars in theNANOGrav 11-year data set, but taking into consideration the noise levels ofeach pulsar and the sampling rate of our observations, we develop limits thatshow we are sensitive to planetary masses as low as that of the moon. Weanalyzed potential planet periods, P, in the range 7 days < P < 2000 days, withsomewhat smaller ranges for some binary pulsars. The planetary mass limit forour median-sensitivity pulsar within this period range is 1 M_moon (P / 100days)^(-2/3).

The NANOGrav 11-year Data Set: Constraints on Planetary Masses Around 45 Millisecond Pulsars