Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..729s&link_type=abstract
Nature (ISSN 0028-0836), vol. 320, April 24, 1986, p. 729-731. Research supported by the European Southern Observatory, Canada-F
Astronomy and Astrophysics
Astronomy
6
Dark Matter, Neptune (Planet), Planetary Rings, Stellar Occultation, Uranus Rings, Uranus Satellites, Detection, Natural Satellites, Space Observations (From Earth), Planets, Giant Planets, Uranus, Neptune, Rings, Occultations, Astronomy, Earth-Based Observations, Procedure, Analysis, Telescope Methods
Scientific paper
Studies using the stellar occultation technique to detect dark matter around Uranus and Neptune are reported. Recent analyses of isolated events observed around Neptune indicate the existence of an incomplete or at least a highly azimuthally variable ring or 'arc' around Neptune. Similar phenomena may be detectable around Uranus. In order to look for yet undetected dark matter around Uranus and Neptune, the best signal-to-noise ratio stellar occultations have been reanalyzed. To be confirmed, an 'event' should be observed with more than one telescope on the same site since the Fresnel scale is about 2-3 km at the level of Uranus and Neptune, and it should also be observed from widely separated observatories (100 to 1000 km apart) to have an idea of the spatial extent of the occulting object, and to distinguish between satellites and ring-like structures. Moreover, theoretical models of diffracting bars or circular objects provide useful tests to reject some isolated events as being incompatible with real and celestial events. An investigation is reported of the surroundings of Uranus and Neptune using stellar occultations observed at the European Southern Observatory (ESO) on Apr. 22, 1982, and at the Canada France Hawaii Telescope (CFHT) on June 15, 1983. The high signal-to-noise ratio of these observations sets stringent limits on the presence of matter around these planets.
Bouchet Patrice
Brahic Andre
Maillard Jean Pierre
Perrier Ch.
Roques Françoise
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