AAS 202nd Meeting, May 2003
Session 55 Solar Systems to Galaxies
Oral, Thursday, May 29, 2003, 10:00-11:30am, 108/109

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[55.03] Earth-size Planets in the PSR B1257+12 Planetary System

M. Konacki (California Institute of Technology), A. Wolszczan (Penn State University)

The field of extrasolar planets has emerged in 1992 with the detection of three terrestrial-mass planets orbiting the millisecond pulsar PSR B1257+12 by Wolszczan & Frail . The pulsar has been observed with the 305 m Arecibo radiotelescope since its discovery in 1990. The pulse arrival time measurements of the pulsar B1257+12 collected over the years 1990-2003 with the Mark-III and the Penn State Pulsar Machine-1 backends supplemented with the new semi-analytical theory of the dynamics of the PSR B1257+12 planetary system allow us now to determine the masses of the planets B and C. The derived masses are respectively 4.3±.2 and 3.9±.2 Earth masses, making it the first determination of the extrasolar planet masses in the Earth-size regime.

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