Evidence for a Planet around the Pulsar PSR B0329+54

The data set of available pulse arrival times of the pulsar PSR B0329+54, including the JPL timing data between 1968 and 1983 and the Pushchino timing data between 1978 and 1994, is analyzed. It is shown that a quasi-sinusoidal modulation with a period of 16.9 yr exists in the timing residuals. This periodicity can be interpreted as evidence for the existence of a planet-like body orbiting the pulsar PSR B0329+54 with a 16.9 yr orbital period. The planet has a minimum mass of about twice the mass of Earth and moves in eccentric orbit (e = 0.23) with a semimajor axis of 7.3 AU. The existence of 3 yr periodicity in arrival times, claimed by Demianski & Proszynski in 1979, is verified. It manifested itself distinctly in the JPL data only after removing the main 16.9 yr periodicity.