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Measuring Supermassive Black Holes in Distant Galaxies with Central Lensed Images
D. Rusin, C. R. Keeton, J. N. Winn
The supermassive black hole at the center of a distant galaxy can be weighed, in rare but realistic cases, when the galaxy acts as a strong gravitational lens. The central image th…
The Radio Variability of the Gravitational Lens PMN J1838-3427
Joshua N. Winn, James E. J. Lovell, Hayley Bignall +8
We present the results of a radio variability study of the gravitational lens PMN J1838-3427. Our motivation was to determine the Hubble constant by measuring the time delay betwee…
Planets in Stellar Clusters Extensive Search. II. Discovery of 57 Variables in the Cluster NGC 2158 with Millimagnitude Image Subtraction Photometry
B. J. Mochejska, K. Z. Stanek, D. D. Sasselov +3
We have undertaken a long-term project, Planets in Stellar Clusters Extensive Search (PISCES), to search for transiting planets in open clusters. NGC 2158 is one of the targets we…
KH 15D: Gradual Occultation of a Pre-Main-Sequence Binary
Joshua N. Winn, Matthew J. Holman, John A. Johnson +2
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…