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In Orbit

机译:在轨

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摘要

The French-led Corot planet-finding satellite has discovered its first Earth-size planet, and the first outside the Solar System to be observed directly as it transited in front of its star. The finding, known for a year but only recently confirmed, was announced at a symposium in Paris on Feb. 3. It is the latest of a series of startling discoveries since Corot was launched in December 2006 (AW&ST Jan. 14, 2008, p. 49). The new planet, known as Corot-Exo-7b, is less than twice the size of Earth, but its density is still unknown. Corot-Exo-7b may be rocky, like Earth, with rock and water present in almost equal amounts and its star is Sun-like. But because it takes just 20 hr. to orbit the parent star, it is too hot (1,000-1,5000) to support life. Daniel Rouan, a scientist at the Paris Observatory, says that some 20 of the 330 or so extra-solar planets discovered to date are in the so-called Super Earth category. All of them but Corot-Exo-7b have been found by radial velocity methods, which give no information on their diameter or structure.
机译:由法国领导的Corot寻星卫星发现了它的第一个地球大小的行星,并且是第一个在太阳系外的行星,因为它在恒星前面经过时可以直接观察到。这一发现已有一年之久,但直到最近才得到确认,该发现于2月3日在巴黎的一次座谈会上宣布。这是自2006年12月Corot推出以来一系列令人震惊的发现中的最新发现(AW&ST,2008年1月14日,p。 49)。这颗名为Corot-Exo-7b的新行星不到地球大小的两倍,但其密度仍然未知。 Corot-Exo-7b可能像地球一样是岩石,岩石和水的含量几乎相等,并且其恒星类似于太阳。但是因为只需要20个小时。绕着母星旋转,太热了(1,000-1,5000)无法维持生命。巴黎天文台的科学家丹尼尔·鲁安(Daniel Rouan)说,迄今为止发现的330颗左右的太阳系超行星中,大约有20颗属于所谓的“超级地球”类别。除Corot-Exo-7b外,所有其他材料均已通过径向速度方法发现,但未提供有关其直径或结构的信息。

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