Computer Science
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.356..583m&link_type=abstract
Nature (ISSN 0028-0836), vol. 356, no. 6370, April 16, 1992, p. 583-585.
Computer Science
42
Orbital Resonances (Celestial Mechanics), Periodic Variations, Planetary Systems, Pulsars, Planetary Mass, Planetary Orbits
Scientific paper
Periodic variations in the arrival times of pulses from the millisecond pulsar PSR1257 + 12 are most straightforwardly interpreted as indicating the presence of two planetlike companions orbiting the pulsar. Rasio et al. (1992) have proposed that the planetary explanation is amenable to a simple test: the deduced parameters put the planets near an orbital resonance, in which case secular evolution of the orbits should be observable in a matter of years. Detection of such orbital evolution would yield the masses and orbital inclinations of the planets. It is pointed out here that if the masses of the two planets are more than about 10 times greater than the minimum values allowed by the observations, then their orbit will be in an exact 3:2 resonance. The character of the predicted orbital parameter perturbations is then markedly different from the periodic pertubations that result from only a near-resonance. The amplitude of the perturbations is much greater and is very sensitive to the planet masses.
Black David
Eck A.
Jackson Andrew
Malhotra Renu
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