首颗超级地球大气成分分析-凯发k8官网

首颗超级地球大气成分分析
文章来源:未知 文章作者:meng 发布时间:2010-12-02 03:38 字体: [ ] 
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the planet gj 1214b was discovered in 2009 using the 1 instrument on eso's 3.6-metre telescope in chile (eso0950 - http://www.eso.org/public/news/eso0950/). initial findings suggested that this planet had an atmosphere, which has now been confirmed and studied in detail by an international team of 2, led by jacob bean (harvard–smithsonian center for astrophysics), using the fors instrument on eso's very large telescope. "this is the first super-earth to have its atmosphere analysed. we've reached a real 3 on the road toward characterising these worlds," said bean.

gj 1214b has a 4(半径) of about 2.6 times that of the earth and is about 6.5 times as massive, putting it squarely into the class of exoplanets(外部行星) known as super-earths. its host star lies about 40 light-years from earth in the 5(星座,星群) of ophiuchus (the serpent bearer). it is a faint star, but it is also small, which means that the size of the planet is large compared to the stellar disc, making it 6 easy to study. the planet travels across the disc of its parent star once every 38 hours as it orbits at a distance of only two million kilometres: about seventy times closer than the earth orbits the sun.

to study the atmosphere, the team observed the light coming from the star as the planet passed in front of it. during these 7, some of the starlight passes through the planet's atmosphere and, depending on the chemical composition and weather on the planet, specific 8 of light are absorbed. the team then compared these precise new measurements with what they would expect to see for several possible 10 compositions.

before the new observations, astronomers had suggested three possible atmospheres for gj 1214b. the first was the 11(有趣的,迷人的) possibility that the planet was 12 by water, which, given the close 13 to the star, would be in the form of steam. the second possibility was that this is a rocky world with an atmosphere consisting mostly of hydrogen, but with high clouds or 14 obscuring the view. the third option was that this exoplanet was like a mini-neptune, with a small rocky core and a deep hydrogen-rich atmosphere.

the new measurements do not show the telltale(报警的,泄密的) signs of hydrogen and hence rule out the third option. therefore, the atmosphere is either rich in steam, or it is blanketed by clouds or hazes, similar to those seen in the atmospheres of venus and titan in our solar system, which hide the signature of hydrogen..

"although we can't yet say exactly what that atmosphere is made of, it is an exciting step forward to be able to narrow down the options for such a distant world to either steamy or hazy(朦胧的,模糊的) ," says bean. "follow-up observations in longer 9 15 light are now needed to determine which of these atmospheres exists on gj 1214b."



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1 43af3ccaaa52a4643b9e0a0261914c63     
abbr.harpsichord 拨弦古钢琴n.竖琴( harp的名词复数 )
参考例句:
  • she continually harps on lack of money. 她总唠叨说缺钱。 来自《简明英汉词典》
  • he could turn on the harps of the blessed. 他能召来天使的竖琴为他奏乐。 来自辞典例句
2 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • astronomers used to ask why only saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
3 c78zm     
n.里程碑;划时代的事件
参考例句:
  • the film proved to be a milestone in the history of cinema.事实证明这部影片是电影史上的一个里程碑。
  • i think this is a very important milestone in the relations between our two countries.我认为这是我们两国关系中一个十分重要的里程碑。
4 ltkxp     
n.半径,半径范围;有效航程,范围,界限
参考例句:
  • he has visited every shop within a radius of two miles.周围两英里以内的店铺他都去过。
  • we are measuring the radius of the circle.我们正在测量圆的半径。
5 cptzi     
n.星座n.灿烂的一群
参考例句:
  • a constellation is a pattern of stars as seen from the earth. 一个星座只是从地球上看到的某些恒星的一种样子。
  • the big dipper is not by itself a constellation. 北斗七星本身不是一个星座。
6 bkqzs3     
adv.比较...地,相对地
参考例句:
  • the rabbit is a relatively recent introduction in australia.兔子是相对较新引入澳大利亚的物种。
  • the operation was relatively painless.手术相对来说不痛。
7 02c20f900dce3e925d6b664dfba9ad97     
通过(transit的复数形式)
参考例句:
  • the anomalistic year is the time between successive transits of the earth through the perihelion. 近点年是地球连续两次通过近日点之间的时间。
  • paradigm study gradually transits to exemplification study in civil society theory. 当前我国的市民社会理论正逐步从范式研究转向范例研究。
8 55c7c1db2849f4af018e7824d42c3ff2     
n.波长( wavelength的名词复数 );具有相同的/不同的思路;合拍;不合拍
参考例句:
  • i find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话,因为我们俩完全不对路。 来自《简明英汉词典》
  • sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
9 8ghwn     
n.波长
参考例句:
  • the authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • radio one has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
10 6eayr     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
11 vqyzm1     
adj.有趣的;迷人的v.搞阴谋诡计(intrigue的现在分词);激起…的好奇心
参考例句:
  • these discoveries raise intriguing questions. 这些发现带来了非常有趣的问题。
  • it all sounds very intriguing. 这些听起来都很有趣。 来自《简明英汉词典》
12 6b3958ee6e7b263c722c8b117143345f     
v.隐瞒( shroud的过去式和过去分词 );保密
参考例句:
  • the hills were shrouded in mist . 这些小山被笼罩在薄雾之中。
  • the towers were shrouded in mist. 城楼被蒙上薄雾。 来自《简明英汉词典》
13 5rsxm     
n.接近,邻近
参考例句:
  • marriages in proximity of blood are forbidden by the law.法律规定禁止近亲结婚。
  • their house is in close proximity to ours.他们的房子很接近我们的。
14 71755b61dcb13e836dfab45a157fdd84     
n.(烟尘等的)雾霭( haze的名词复数 );迷蒙;迷糊;(尤指热天引起的)薄雾v.(使)笼罩在薄雾中( haze的第三人称单数 );戏弄,欺凌(新生等,有时作为加入美国大学生联谊会的条件)
参考例句:
  • together we share fogs, flowing hazes and rainbows. 我们共享雾蔼、流岚、虹霓。 来自互联网
  • our loves will blow away the hazes involved around childrens in the disaster areas. 我们的爱心,将驱散笼罩在灾区孩子心中的阴霾。 来自互联网
15 dx0yp     
adj./n.红外线(的)
参考例句:
  • infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
  • infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。
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