Abstract
WE have detected an optical pulsar with frequency f = 1,968.629 Hz at the location of supernova 1987A in the Large Magellanic Cloud. The brightness of the pulsed light increased from magnitude 19 to 18 during a 7-h observation period starting on 18.1 January 1989 UT, in observations taken using the 4-m telescope at Cerro Tololo Inter-American Observatory. The frequency of the pulsar during this same period varied in a nearly sinusoidal manner, with an amplitude of 1.5 x 10-3 Hz and a period of 8h. If this is interpreted as the result of a binary orbit, it suggests that there may be a Jupiter-sized object orbiting the pulsar at a distance of 106 km. No significant pulsations were seen in data taken with the same detection system at the 100" telescope at Las Campanas Observatory on 31 January UT, indicating that the pulsar had dropped below our detection limit of magnitude 20. Significant second (2f) and third (3f) harmonics were also observed.
Similar content being viewed by others
References
Middleditch, J. et al. IAU Circ. No. 4735, (1989).
Pennypacker, C. et al. Astrophys. J. (in the press).
Middleditch, J. & Cordova, F. A. Astrophys. J. 255, 585–595 (1982).
Middleditch, J. & Kristian, J. Astrophys. J. 279, 157–162 (1984).
Friedman, J. L., Ipser, J. R. & Parker, L. Nature 312, 255–257 (1984).
Friedman, J. L., Imamura, J. N., Durisen, R. H. & Parker, L. Nature 336, 560–562 (1988).
Fruchter, A. S., Stinebring, D. R. & Taylor, J. H. Nature 333, 237–239 (1988).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kristian, J., Pennypacker, C., Middledrtch, J. et al. Submillisecond optical pulsar in supernova 1987A. Nature 338, 234–236 (1989). https://doi.org/10.1038/338234a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/338234a0
- Springer Nature Limited
This article is cited by
-
Strangeness in stellar matter
Acta Physica Hungarica A) Heavy Ion Physics (1996)