S. N. Quinn, R. J. White, D. W. Latham, L. A. Buchhave, J. R. Cantrell, S. E. Dahm, G. Fürész, A. H. Szentgyorgyi, J. C. Geary, G. Torres, A. Bieryla, P. Berlind, M. C. Calkins, G. A. Esquerdo, R. P. Stefanik
We present the discovery of two giant planets orbiting stars in Praesepe (also known as the Beehive Cluster), the first known hot Jupiters in an open cluster. Pr0201b orbits a V=10.52 late F dwarf with a period of 4.4264 +/- 0.0070 days and has a minimum mass of 0.540 +/- 0.039 Mjup, and Pr0211b orbits a V=12.06 late G dwarf with a period of 2.1451 +/- 0.0012 days and has a minimum mass of 1.844 +/- 0.064 Mjup. Because they reside in a cluster, the ages of these planets are amongst the best-determined of any planet outside our own solar system. As we endeavor to learn more about the frequency and characteristics of planets, the environment in which most stars form -- open clusters like Praesepe -- may provide essential clues to this end. This discovery will allow, for the first time, a direct estimate of the short-period giant planet frequency in open clusters.
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http://arxiv.org/abs/1207.0818
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