File:New Insights into Debris Discs.jpg
原始文件 (2,000 × 2,000像素,文件大小:147 KB,MIME类型:image/jpeg)
说明
摘要[编辑]
描述New Insights into Debris Discs.jpg |
English: Using 39 of the 66 antennas of the Atacama Large Millimeter/submillimeter Array (ALMA), located 5000 metres up on the Chajnantor plateau in the Chilean Andes, astronomers have been able to detect carbon monoxide (CO) in the disc of debris around an F-type star. Although carbon monoxide is the second most common molecule in the interstellar medium, after molecular hydrogen, this is the first time that CO has been detected around a star of this type. The star, named HD 181327, is a member of the Beta Pictoris moving group, located almost 170 light-years from Earth.
Until now, the presence of CO has been detected only around a few A-type stars, substantially more massive and luminous than HD 181327. Using the superb spatial resolution and sensitivity offered by the ALMA observatory astronomers were now able to capture this stunning ring of smoke and map the density of the CO within the disc. The study of debris discs is one way to characterize planetary systems and the results of planet formation. The CO gas is found to be co-located with the dust grains in the ring of debris and to have been produced recently. Destructive collisions of icy planetesimals in the disc are possible sources for the continuous replenishment of the CO gas. Collisions in debris discs typically require the icy bodies to be gravitationally perturbed by larger objects in order to reach sufficient collisional velocities. Moreover, the derived CO composition of the icy planetesimals in the disc is consistent with the comets in our Solar System. This possible secondary origin for the CO gas suggests that icy comets could be common around stars similar to our Sun which has strong implications for life suitability in terrestrial exoplanets. The results were published in the journal Monthly Notices of the Royal Astronomical Society under the title “Exocometary gas in the HD 181327 debris ring” by S. Marino et al. |
日期 | (released) |
来源 | http://www.eso.org/public/images/potw1621a/ |
作者 | ESO/Marino et al. |
许可协议[编辑]
This media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. | |
文件历史
点击某个日期/时间查看对应时刻的文件。
日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
---|---|---|---|---|---|
当前 | 2018年9月26日 (三) 16:20 | 2,000 × 2,000(147 KB) | Huntster(留言 | 贡献) | Full size. | |
2016年5月23日 (一) 09:28 | 1,280 × 1,280(57 KB) | Jmencisom(留言 | 贡献) | User created page with UploadWizard |
您不可以覆盖此文件。
文件用途
以下2个页面使用本文件:
全域文件用途
以下其他wiki使用此文件:
- ca.wikipedia.org上的用途
- en.wikipedia.org上的用途
- en.wikiversity.org上的用途
- es.wikipedia.org上的用途
- eu.wikipedia.org上的用途
- fr.wikipedia.org上的用途
- id.wikipedia.org上的用途
- ja.wikipedia.org上的用途
- ko.wikipedia.org上的用途
- nl.wikipedia.org上的用途
- pt.wikipedia.org上的用途
- ru.wikipedia.org上的用途
- tr.wikipedia.org上的用途
- uk.wikipedia.org上的用途
- vi.wikipedia.org上的用途
- zh.wikipedia.org上的用途
元数据
此文件中包含有额外的信息。这些信息可能是由数码相机或扫描仪在创建或数字化过程中所添加。
如果文件已从其原始状态修改,某些细节可能无法完全反映修改后的文件。
提供人 | ESO/Marino et al. |
---|---|
来源 | European Southern Observatory |
简称 |
|
图像标题 |
|
使用条款 |
|
数据生成日期时间 | 2016年5月23日 (一) 06:00 |
使用软件 | Adobe Photoshop CC 2015 (Windows) |
文件修改日期时间 | 2016年5月18日 (三) 10:17 |
数字化日期时间 | 2016年5月18日 (三) 11:57 |
原始数据最后修改日期 | 2016年5月18日 (三) 12:17 |
原始文件唯一ID | xmp.did:db56a5ec-32db-a94b-8c88-0ee7a4be12ad |
关键词 | HD 181327 |
联系信息 |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM 版本 | 4 |