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Title:
Direct Imaging of Multiple Planets Orbiting the Star HR 8799
Authors:
Marois, Christian; Macintosh, Bruce; Barman, Travis; Zuckerman, B.; Song, Inseok; Patience, Jennifer; Lafrenière, David; Doyon, René
Affiliation:
AA(National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA), AB(Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA), AC(Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA), AD(Physics and Astronomy Department and Center for Astrobiology, University of California, Los Angeles, CA 90095, USA), AE(University of Georgia, Department of Physics and Astronomy, 240 Physics, Athens, GA 30602, USA), AF(University of Exeter, School of Physics, Stocker Road, Exeter EX4 4QL, UK.), AG(Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada.), AH(Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada.)
Publication:
Science, Volume 322, Issue 5906, pp. 1348- (2008). (Sci Homepage)
Publication Date:
11/2008
Origin:
SCIENCE
DOI:
10.1126/science.1166585
Bibliographic Code:
2008Sci...322.1348M

Abstract

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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