We search for extrasolar planets around millisecond pulsars using pulsar timing data and seek to determine the minimum detectable planetary masses as a function of orbital period. Using the 11-year data set from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), we look for variations from our models of pulse arrival times due to the presence of exoplanets. No planets are detected around the millisecond pulsars in the NANOGrav 11-year data set, but taking into consideration the noise levels of each pulsar and the sampling rate of our observations, we develop limits that show we are sensitive to planetary masses as low as that of the moon. We analyzed potential planet periods, P, in the range 7 days < P < 2000 days, with somewhat smaller ranges for some binary pulsars. The planetary mass limit for our median-sensitivity pulsar within this period range is 1 M_moon (P / 100 days)^(-2/3).
@article{arxiv.1912.00482,
title = {The NANOGrav 11-year Data Set: Constraints on Planetary Masses Around 45 Millisecond Pulsars},
author = {E. A. Behrens and S. M. Ransom and D. R. Madison and Z. Arzoumanian and K. Crowter and M. E. DeCesar and P. B. Demorest and T. Dolch and J. A. Ellis and R. D. Ferdman and E. C. Ferrara and E. Fonseca and P. A. Gentile and G. Jones and M. L. Jones and M. T. Lam and L. Levin and D. R. Lorimer and R. S. Lynch and M. A. McLaughlin and C. Ng and D. J. Nice and T. T. Pennucci and B. B. P. Perera and P. S. Ray and R. Spiewak and I. H. Stairs and K. Stovall and J. K. Swiggum and W. W. Zhu},
journal= {arXiv preprint arXiv:1912.00482},
year = {2020}
}