File:Spectrum of planet around HR 8799 (crop).jpg

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English: By studying a triple planetary system that resembles a scaled-up version of our own Sun’s family of planets, astronomers have been able to obtain the first direct spectrum of a planet around a star, thus bringing new insights into its formation and composition. The spectrum is that of a giant exoplanet, orbiting around the bright and very young star HR 8799, about 130 light-years away. This spectrum of the star and the planet was obtained with the NACO adaptive optics instrument on ESO’s Very Large Telescope. As the host star is several thousand times brighter than the planet, this is a remarkable achievement, at the border of what is technically possible. According to the scientists it is like trying to see what a candle is made of, by observing it from a distance of two kilometres when it’s next to a blindingly bright 300 Watt lamp. Despite the power of the VLT’s extraordinary adaptive optics system, the spectrum of the planet appears very faint, but still contains enough information for the astronomers to characterise the object. In the spectrum several artefacts from the instrument are seen, such as internal reflections, or “ghosts”, and diffraction rings.
Español: A través del estudio de un sistema planetario triple que se asemeja a una versión aumentada de nuestra propia familia solar de planetas, los astrónomos han sido capaces de obtener el primer espectro directo de un planeta orbitando una estrella, lo que proporciona nuevos conocimientos sobre su formación y composición. El espectro corresponde a un exoplaneta gigante que orbita la brillante y muy joven estrella HR 8799, a unos 130 años-luz de la Tierra. Este espectro de la estrella y el planeta fue obtenido con el instrumento de óptica adaptativa NACO en el Very Large Telescope de ESO. Debido a que la estrella madre es varios miles de veces más brillante que el planeta, este es un logro notable, en el borde de lo técnicamente posible. Según los científicos es como tratar de ver de qué está hecha una vela, observándola desde una distancia de dos kilómetros mientras está al lado de una lámpara de 300 Watt cegadoramente brillante. A pesar del poder del sistema de óptica adaptativa, el espectro del planeta aparece muy borroso, pero aún así contiene suficiente información que permite a los astrónomos caracterizar el objeto. En el espectro se ven varios efectos generados por el instrumento mismo, como los reflejos internos o "fantasmas" y los anillos de difracción.
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Source http://www.eso.org/public/images/eso1002f/
Author ESO/M. Janson

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current13:17, 12 October 2013Thumbnail for version as of 13:17, 12 October 20131,980 × 984 (203 KB)Stas1995 (talk | contribs)User created page with UploadWizard

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