Jura M, Turner J
Department of Physics and Astronomy, University of California, Los Angeles 90095-1562, USA.
Nature. 1998 Sep 10;395(6698):144-5. doi: 10.1038/25938.
The discovery of planets in orbit around the pulsar PSR1257+12 shows that planets may form around post-main-sequence stars. Other evolved stars, such as HD44179 (an evolved star which is part of the binary system that has expelled the gas and dust that make the Red Rectangle nebula), possess gravitationally bound orbiting dust disks. It is possible that planets might form from gravitational collapse in such disks. Here we report high-angular-resolution observations at millimetre and submillimetre wavelengths of the dusk disk associated with the Red Rectangle. We find a dust clump with an estimated mass near that of Jupiter in the outer region of the disk. The clump is larger than our Solar System, and far beyond where planet formation would normally be expected, so its nature is at present unclear.
在脉冲星PSR1257+12轨道上发现行星表明，行星可能在主序后恒星周围形成。其他演化恒星，如HD44179（这是一个演化恒星，属于已将形成红矩形星云的气体和尘埃排出的双星系统的一部分），拥有引力束缚的轨道尘埃盘。在这样的尘埃盘中，行星有可能通过引力坍缩形成。在此，我们报告了对与红矩形相关的尘埃盘在毫米和亚毫米波长下的高角分辨率观测结果。我们在尘埃盘的外部区域发现了一个尘埃团块，其估计质量接近木星的质量。该团块比我们的太阳系还要大，并且远远超出了正常预期的行星形成区域，因此其性质目前尚不清楚。
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