Direct Imaging of Multiple Planets Orbiting the Star HR 8799

Details Direct Imaging of Multiple Planets Orbiting the Star HR 8799 Direct Imaging of Multiple Planets Orbiting the Star HR 8799

2008-11-16

arxiv.org/abs/0811.2606v1

Science 322:1348-1352,2008

Astronomy and Astrophysics

Astrophysics

30 pages, 5 figures, Research Article published online in Science Express Nov 13th, 2008

Scientific paper

10.1126/science.1166585

Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, and is a key step towards imaging Earth-like planets. Imaging detections are challenging due to the combined effect of small angular separation and large luminosity contrast between a planet and its host star. High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units. Multi-epoch data show counter-clockwise orbital motion for all three imaged planets. The low luminosity of the companions and the estimated age of the system imply planetary masses between 5 and 13 times that of Jupiter. This system resembles a scaled-up version of the outer portion of our Solar System.

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