Ficheru:Fomalhaut Circumstellar Disk.jpg
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DescripciónFomalhaut Circumstellar Disk.jpg |
English: The NASA Spitzer Space Telescope has obtained the first infrared images of the dust disc surrounding Fomalhaut, the 18th brightest star in the sky. Planets are believed to form from such a flattened disc-like cloud of gas and dust orbiting a star very early in its life. The Spitzer telescope was designed in part to study these circumstellar discs, where the dust particles are so cold that they radiate primarily at infrared wavelengths. Located in the constellation Piscis Austrinus, the parent star and its putative planetary system are found at a distance of 25 light-years.
Twenty years ago, the Infrared Astronomical Satellite, the first orbiting infrared telescope, detected much more infrared radiation coming from Fomalhaut than was expected for a normal star of this type. The dust is presumed to be debris left over from the formation of a planetary system. However, the satellite did not have adequate spatial resolution to image the dust directly. Subsequent measurements with sub-millimeter radio telescopes suggested that Fomalhaut is surrounded by a huge dust ring 370 astronomical units (an astronomical unit is the average distance between the Sun and Earth), or 34 billion miles (56 billion kilometers) in diameter. This corresponds to a size of nearly five times larger than our own solar system. Moreover, the sub-millimeter observations (far right image) revealed that the ring was inclined 20 degrees from an edge-on view. The new images obtained with the multiband imaging photometer onboard Spitzer confirm this general picture, while revealing important new details of Fomalhaut's circumstellar dust. The 70-micron data (red) clearly shows an asymmetry in the dust distribution, with the southern lobe one-third brighter than the northern. Such an unbalanced structure could be produced by a collision between moderate-sized asteroids in the recent past (releasing a localized cloud of dust) or by the steering effects of ring particles by the gravitational influence of an unseen planet. At 24 microns (green), the Spitzer image shows that the center of the ring is not empty. [Note that an image of a reference star was subtracted from the Fomalhaut image to reveal the faint disc emission.] Instead, the 'doughnut hole' is filled with warmer dust that extends inward to within at least 10 astronomical units of the parent star. This warm inner disc of dust occupies the region that is most likely to be occupied by planets and may be analogous to our solar system's 'zodiacal cloud' -- but with considerably more dust. One possible explanation for this warmer dust is that comets are being nudged out of the circumstellar ring by the gravitational influence of massive planets. These comets then loop in toward the central star, releasing dust particles just as comets do in our own solar system. |
Data | |
Fonte | http://www.spitzer.caltech.edu/images/1100-ssc2003-06i%20-Fomalhaut-Circumstellar-Disk |
Autor | NASA/JPL-Caltech/K. Stapelfeldt (JPL), James Clerk Maxwell Telescope |
Permisu (Cómo reutilizar esti ficheru) |
Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy |
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Public domainPublic domainfalsefalse |
Este archivo es de dominio público porque fue creado por la NASA. Las políticas sobre copyright de la NASA estipulan que «el material de la NASA no está protegido con copyright a menos que se indique lo contrario». (Políticas sobre copyright de la NASA o Políticas sobre la utilización de imágenes del Jet Propulsion Laboratory). | ||
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18 avi 2003
tipo de archivo español
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actual | 15:29 22 set 2023 | 1497 × 1041 (288 kB) | Beao | Cropped < 1 % horizontally, 13 % vertically using CropTool with lossless mode. Removed watermark. | |
20:36 21 xun 2011 | 1500 × 1200 (383 kB) | Spitzersteph |
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Títulu de la imaxe |
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Autor | Spitzer Space Telescope |
Titular del Copyright | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
Títulu curtiu |
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Créitu/Fornidor | NASA/JPL-Caltech/K. Stapelfeldt (JPL), James Clerk Maxwell Telescope |
Titular | The NASA Spitzer Space Telescope has obtained the first infrared images of the dust disc surrounding Fomalhaut, the 18th brightest star in the sky. Planets are believed to form from such a flattened disc-like cloud of gas and dust orbiting a star very early in its life. |
Fonte | Spitzer Space Telescope |
Términos d'usu |
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Data y hora de xeneración de los datos | 18 avi 2003 |
Anchor | 1500 px |
Altor | 1200 px |
Bits por componente |
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Esquema de compresión | LZW |
Composición del píxel | RGB |
Orientación | Normal |
Númberu de componentes | 3 |
Resolución horizontal | 300 ppp |
Resolución vertical | 300 ppp |
Distribución de los datos | formatu irregular |
Software usáu | Adobe Photoshop CS3 Macintosh |
Data y hora de cambiu del ficheru | 14:39 5 xun 2009 |
Espaciu de color | Ensin calibrar |
Información de contautu |
http://www.spitzer.caltech.edu 1200 E. California Blvd. Pasadena, CA, 91125 USA |
Pallabres clave |
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Versión d'IIM | 2 |