arXiv 1111.10072011-11-03astro-ph.EP

The Pan-Pacific Planet Search. I. A Giant Planet Orbiting 7 CMa

R. A. Wittenmyer, M. Endl, L. Wang, J. A. Johnson, C. G. Tinney, S. J. O'Toole

备注：: Accepted for publication in ApJ
DOI：: 10.1088/0004-637X/743/2/184

英文摘要：

We introduce the Pan-Pacific Planet Search, a survey of 170 metal-rich Southern hemisphere subgiants using the 3.9m Anglo-Australian Telescope. We report the first discovery from this program, a giant planet orbiting 7 CMa (HD 47205) with a period of 763+/-17 days, eccentricity e=0.14+/-0.06, and m sin i=2.6+/-0.6 M_jup. The host star is a K giant with a mass of 1.5+/-0.3 M_sun and metallicity [Fe/H]=0.21+/-0.10. The mass and period of 7 CMa b are typical of planets which have been found to orbit intermediate-mass stars (M*>1.3 M_sun). Hipparcos photometry shows this star to be stable to 0.0004 mag on the radial-velocity period, giving confidence that this signal can be attributed to reflex motion caused by an orbiting planet.

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