Spectrum of planet around HR 8799

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.


ESO/M. Janson

About the Image

Release date:13 January 2010, 12:00
Related releases:eso1002
Size:1980 x 984 px

About the Object

Name:HR 8799, Spectrum
Type:Milky Way : Star : Evolutionary Stage : Young Stellar Object
Distance:130 light years

Image Formats

Large JPEG
204.2 KB
Screensize JPEG
62.7 KB


95.9 KB
133.0 KB
181.9 KB
217.9 KB
271.9 KB