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      POPULATION PROPERTIES OF BROWN DWARF ANALOGS TO EXOPLANETS

      The Astrophysical Journal Supplement Series
      American Astronomical Society

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          Young Stars Near the Sun

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            Alkali Element Chemistry in Cool Dwarf Atmospheres

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              Direct Imaging of Multiple Planets Orbiting the Star HR 8799

              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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                10.3847/0067-0049/225/1/10
                http://iopscience.iop.org/info/page/text-and-data-mining

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