RT Journal Article
SR Electronic
T1 Confirmation of Earth-Mass Planets Orbiting the Millisecond Pulsar PSR B1257 + 12
JF Science
JO Science
FD American Association for the Advancement of Science
SP 538
OP 542
DO 10.1126/science.264.5158.538
VO 264
IS 5158
A1 Wolszczan, Alexander
YR 1994
UL http://science.sciencemag.org/content/264/5158/538.abstract
AB The discovery of two Earth-mass planets orbiting an old (∼109 years), rapidly spinning neutron star, the 6.2-millisecond radio pulsar PSR B1257+12, was announced in early 1992. It was soon pointed out that the approximately 3:2 ratio of the planets' orbital periods should lead to accurately predictable and possibly measurable gravitational perturbations of their orbits. The unambiguous detection of this effect, after 3 years of systematic timing observations of PSR B1257+12 with the 305-meter Arecibo radiotelescope, as well as the discovery of another, moon-mass object in orbit around the pulsar, constitutes irrefutable evidence that the first planetary system around a star other than the sun has been identified.