Wednesday, August 12, 2015

The Weihai Observatory's Observation of HD 62509b

The Weihai Observatory search for close-in planets orbiting giant stars


Wittenmyer et al


Planets are known to orbit giant stars, yet there is a shortage of planets orbiting within ~0.5 AU (P less than 100 days). First-ascent giants have not expanded enough to engulf such planets, but tidal forces can bring planets to the surface of the star far beyond the stellar radius. So the question remains: are tidal forces strong enough in these stars to engulf all the missing planets? We describe a high-cadence observational program to obtain precise radial velocities of bright giants from Weihai Observatory of Shandong University. We present data on the planet host Beta Gem (HD 62509), confirming our ability to derive accurate and precise velocities; our data achieve an rms of 7.3 m/s about the Keplerian orbit fit. This planet-search programme currently receives ~100 nights per year, allowing us to aggressively pursue short-period planets to determine whether they are truly absent.

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