Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-06-11
Astronomy and Astrophysics
Astrophysics
To appear in "Millisecond Pulsars: A Decade of Surprises" (proceedings of Aspen Winter Astrophysics Conference, eds. A. Frucht
Scientific paper
About two years ago, Wolszczan and Frail announced the detection of a possible planetary system consisting of two Earth-mass planets around a millisecond pulsar. It was pointed out shortly thereafter that the mutual gravitational interaction of the planets leads to predictable evolution of their orbits. Because millisecond pulsars are very stable ``clocks'' and allow pulse timing measurements with microsecond precision, the orbit evolution would lead to a measurable modulation of the arrival times of the pulses. Detection of this effect would serve to corroborate the planetary interpretation of the data and provide additional constraints on the system. The theory of planetary perturbations in the context of pulsar timing observations is summarized here.
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