期刊
SCIENCE
卷 322, 期 5906, 页码 1348-1352出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1166585
关键词
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资金
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- U. S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- NSF Science and Technology CfAO
- University of California-Santa Cruz [AST 98-76783]
- NASA
- UCLA
- Lowell Observatory
- Natural Sciences and Engineering Research Council of Canada
- STFC [ST/F003277/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F003277/1] Funding Source: researchfish
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 toward imaging Earth- like planets. Imaging detections are challenging because of 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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