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Deep Keck adaptive optics searches for extrasolar planets in the dust of Epsilon Eridani an.pdf

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Deep Keck adaptive optics searches for extrasolar planets in the dust of Epsilon Eridani an

Submitted to Ap.J. October 11 2002, revised March 12 2003 Deep Keck adaptive optics searches for extrasolar planets in the dust of Epsilon Eridani and Vega Bruce A. Macintosh Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, 7000 East Ave. L-413, Livermore, CA 94551 bmac@ E. E. Becklin, Denise Kaisler, Quinn Konopacky, B. Zuckerman Department of Physics and Astronomy, UCLA, 8371 Math Sciences Building, Box 951562 Los Angeles, CA 90095-1562 ABSTRACT A significant population of nearby stars have strong far-infrared excesses, now known to be due to circumstellar dust in regions analogous to the Kuiper Belt of our solar system, though orders of magnitude more dense. Recent sub-mm and mm imaging of these systems resolves the circumstellar dust and reveals complex structures, often in the form of rings with azimuthal non- axisymmetric variations. This structure might well be due to the presence of embedded brown dwarfs or planets. We have carried out deep adaptive optics imaging of two nearby stars with such asymmetric dust: Epsilon Eridani and Vega. Ten and seven candidate companions were seen in and near the dust rings of Epsilon Eridani and Vega respectively, but second-epoch proper motion measurements indicate that all are background objects. Around these two stars we can thus exclude planetary companions at spatial scales comparable to the radius of the dust structures to a level of MK=24, corresponding to 5 Jupiter masses, for Epsilon Eridani, and MK=19-21, corresponding to 6-8 Jupiter masses, for Vega. 1. Introduction The IRAS satellite discovered that a significant population of nearby main sequence stars, including Vega, display strong excess far-infrared emission, now known to be due to circumstellar dust (Zuckerman 2001 and references therein.) The region containing the dust at these ?Vega-like? stars is analogous to the Solar System region associated with the Kuiper Belt, though the tot