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Planet Found Around Wrong Kind Of Star

发现有行星绕着不同以往类型的恒星转

Astronomers have already discovered hundreds of exoplanets. But make way for the new kid. Which is orbiting a kind of star that models say it shouldn’t.

天文学家已发现了数以百计的太阳系外行星。但是,现在该给新成员腾让地方了,这颗行星围绕着某颗恒星旋转,用事实证明了传统理论可不完全正确。

Researchers found the exoplanet while looking at the star HIP 13044 — or Sergio, for Star of Extra-Galactic Origin. It’s in what once was a separate galaxy, which the Milky Way gobbled up billions of years ago.

研究人员是在研究HIP 13044恒星的时候发现了这颗太阳系外行星。恒星HIP 13044 又名Sergio(塞尔吉奥),取“在银河系外起源的恒星”之意。它在曾经是一个独立的星系,在几十亿年前被银河系吞并了。

The scientists saw Sergio wobbling due to the gravitational tug of a Jupiter-sized gas planet, which the scientists dubbed Sergio Junior. They detail their find in the journal Science.

科学家们观察到Sergio(塞尔吉奥)由于受到一个木星大小的气态行星造成的引力而变得不稳定,科学家将这颗气态行星戏称为Sergio(塞尔吉奥)二世。他们在《科学》杂志上详细叙述了自己的发现。

You don’t ordinarily find planets hanging around a star like Sergio. First, it's really old — past the Red Giant phase, when stars balloon in size and swallow up planets in close orbits. And planets tend to form around metal-rich stars, like our Sun. But Sergio has only one percent the metal content of our Sun. That doesn't jibe with one widely accepted model of planetary formation.

通常,你不会在如Sergio(塞尔吉奥)这样的恒星周围发现行星。首先,它非常非常老了——它经历过红巨星阶段,这一阶段的恒星会急剧膨胀,吞噬在临近轨道运行的行星。而行星往往会在富含金属的恒星——好似我们的太阳这种恒星——周围形成。可Sergio(塞尔吉奥)的金属含量只有太阳的百分之一。这种情况跟一个被广泛接受的行星形成模型并不一致。

The Sergios may offer a glimpse of the future of our own planetary system — in about five billion years. We hope to be back then with an update.

Sergios(塞尔吉奥)或许可以让我们一窥自己的行星系统——大约50亿年后的未来。到那时候,我们希望还能回来再更新节目给大家。

—Christopher Intagliata

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