File:Ssc2007-04c.jpg
原始文件 (3,000 × 2,400像素,文件大小:504 KB,MIME类型:image/jpeg)
说明
摘要
[编辑]This infrared data from NASA's Spitzer Space Telescope -- called a spectrum -- tells astronomers that a distant gas planet, a so-called "hot Jupiter" called HD 189733b, might be smothered with high clouds. It is one of the first spectra of an alien world.
A spectrum is created when an instrument called a spectrograph cracks light from an object open into a rainbow of different wavelengths. Patterns or ripples within the spectrum indicate the presence, or absence, of molecules making up the object.
Astronomers using Spitzer's spectrograph were able to obtain infrared spectra for two so-called "transiting" hot-Jupiter planets using the "secondary eclipse" technique. In this method, the spectrograph first collects the combined infrared light from the planet plus its star, then, as the planet is eclipsed by the star, the infrared light of just the star. Subtracting the latter from the former reveals the planet's own rainbow of infrared colors.
Astronomers were perplexed when they first saw the infrared spectrum above. It doesn't look anything like what theorists had predicted. Theorists thought the spectra of hot, Jupiter-like planets like this one would be filled with the signatures of molecules in the planets' atmospheres. But the spectrum doesn't show any molecules, and is instead what astronomers call "flat." For example, theorists thought there'd be a strong signature of water in the form of a big drop in the wavelength range between 7 and 10 microns. The fact that water is not detected may indicate that it is hidden underneath a thick blanket of high, dry clouds. The average brightness of the spectrum is also a bit lower than theoretical predictions, suggesting that very high winds are rapidly moving the terrific heat of the noonday sun from the day side of HD 189733b to the night side.
This spectrum was produced by Dr. Carl Grillmair of NASA's Spitzer Science Center at the California Institute of Technology in Pasadena, Calif., and his colleagues. The data were taken by Spitzer's infrared spectrograph on November 22, 2006.
File info
[编辑]描述Ssc2007-04c.jpg | Cracking the Code of Faraway Worlds | |||||
日期 | ||||||
来源 | http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=ssc2007-04c | |||||
作者 | NASA/JPL-Caltech/C. Grillmair (SSC/Caltech) | |||||
授权 (二次使用本文件) |
http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml | |||||
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[编辑]see http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=ssc2007-04c High quality tif files also avaliable.
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[编辑]Public domainPublic domainfalsefalse |
本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ||
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当前 | 2007年7月11日 (三) 20:17 | 3,000 × 2,400(504 KB) | Anzibanonzi(留言 | 贡献) | ==Summary== This infrared data from NASA's Spitzer Space Telescope -- called a spectrum -- tells astronomers that a distant gas planet, a so-called "hot Jupiter" called HD 189733b, might be smothered with high clouds. It is one of the first spectra of an |
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作者 | Spitzer Space Telescope |
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著作权持有人 | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
宽度 | 3,000 px |
高度 | 2,400 px |
压缩方案 | LZW |
像素构成 | RGB |
方向 | 正常 |
色彩组分数 | 3 |
水平分辨率 | 300 dpi |
垂直分辨率 | 300 dpi |
数据排布 | 大块格式 |
使用软件 | [[w:Adobe Photoshop CS3 (10.0x20070201 [20070201.m.1366 2007/02/01:02:00:00 cutoff; m branch]) Macintosh|Adobe Photoshop CS3 (10.0x20070201 [20070201.m.1366 2007/02/01:02:00:00 cutoff; m branch]) Macintosh]] |
文件修改日期时间 | 2007年2月20日 (二) 15:21 |
色彩空间 | sRGB |