Occultation Of X-rays From Sco X-1 By Small Trans-neptunian Objects

Details Occultation Of X-rays From Sco X-1 By Small Trans-neptunian Objects Occultation Of X-rays From Sco X-1 By Small Trans-neptunian Objects

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4416c&link_type=abstract

American Astronomical Society, DPS meeting #38, #44.16; Bulletin of the American Astronomical Society, Vol. 38, p.1299

Astronomy and Astrophysics

Astronomy

Scientific paper

The size distribution of TNOs is only known for larger ones. The method of occultation makes it possible to reveal the existence of smaller TNOs. Here we report the recent discovery of occultation events at millisecond time scales in the RXTE/PCA light curve of Scorpius X-1. Assumed to be at a heliocentric distance of 43 AU in a circular Keplerian orbital motion, these occulting TNOs are estimated to have sizes about or less than 100 m. Their abundance is in line with an extrapolation from the size distribution of TNOs larger than 100 km, without showing any indication of a possible turnover predicted by coagulation models for planet formation with collisional erosion. Diffraction patterns in the occultation light curves may provide further information to better determine the distances of these occulting TNOs.

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