A search for X-ray emission from Saturn, Uranus and Neptune

来自钛学术

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公开/公告号：

10.1086/301279

公开/公告日期：

2000/03/01

发明人：

JU Ness，JHMM Schmitt

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关键词：

planets and satellites : general planets and satellites : individual : Neptune planets and satellites : individual : Saturn planets and satellites : individual : Uranus X-rays : general

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摘要：

We present an analysis of X-ray observations of the trans-Jovian planets Saturn, Uranus and Neptune with the ROSAT PSPC in comparison with X-ray observations of Jupiter. For the first time a marginal X-ray detection of Saturn was found and 95% confidence upper limits for Uranus and Neptune were obtained. These upper limits show that Jupiter-like X-ray luminosities can be excluded for all three planets, while they are consistent assuming intrinsic Saturn-like X-ray luminosities. Similar X-ray production mechanisms on all trans-Jovian planets can therefore not be ruled out, and spectral shape and total luminosity observed from Saturn are consistent with thick-target bremsstrahlung caused by electron precipitation as occurring in auroral emission from the Earth.

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