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KH 15D: Gradual Occultation of a Pre-Main-Sequence Binary

Joshua N. WinnHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Matthew J. HolmanHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138John A. JohnsonDepartment of Astronomy, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720-3411Krzysztof Z. StanekHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Peter M. GarnavichDepartment of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556

2004en

ABI

Annotatsiya

We propose that the extraordinary "winking star" KH 15D is an eccentric pre-main-sequence binary that is gradually being occulted by an opaque screen. This model accounts for the periodicity, depth, duration, and rate of growth of the modern eclipses; the historical light curve from photographic plates; and the existing radial velocity measurements. It also explains the rebrightening events that were previously observed during eclipses and the subsequent disappearance of these events. We predict the future evolution of the system and its full radial velocity curve. Given the small velocity of the occulting screen relative to the center of mass of the binary, the screen is probably associated with the binary and may be the edge of a precessing circumbinary disk.

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DOI: 10.1086/383089

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