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| AN OBSERVATIONAL TEST FOR THE EXISTENCE OF A PLANETARY SYSTEM ORBITING PSR1257+12 |
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| Author(s): RASIO FA, NICHOLSON PD, SHAPIRO SL, TEUKOLSKY SA |
| Source: NATURE Volume: 355 Issue: 6358 Pages: 325-326 Published: JAN 23 1992 |
| Times Cited: 44 References: 9 |
| Abstract: FOLLOWING the first report 1 of an object of planetary mass orbiting a pulsar, Wolszczan and Frail 2 have now reported the even more surprising discovery of two planet-size companions in orbit around the nearby millisecond pulsar PSR1257 + 12. The orbital periods of the two planets are about 98 days and 67 days, very close to a 3:2 ratio. Here we point out that, because of this near commensurability, the mutual gravitational perturbations of the two planets should produce not only small secular changes, but also larger periodic changes in their orbital elements. In particular, we find that changes in the eccentricities and orbital periods should become measurable within a few years. Such a measurement would help determine the three masses in the system and the inclinations of the orbits. More importantly, a detection of these changes, if they accord with the theoretical predictions presented here, would provide irrefutable confirmation that the periodic residuals observed by Wolszczan and Frail are indeed caused by orbiting planets, rather than some other effect. For the single planet-size object previously reported' around the pulsar PSR1829 - 10, there is no dynamical test analogous to the one proposed here to confirm the planetary interpretation. |
| Document Type: Article |
| Language: English |
| Reprint Address: RASIO, FA (reprint author), CORNELL UNIV, CTR RADIOPHYS & SPACE RES, ITHACA, NY 14853 USA |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: HA591 |
| ISSN: 0028-0836 |
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