A Search for Multi-Planet Systems

Details A Search for Multi-Planet Systems A Search for Multi-Planet Systems

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115004w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #150.04; Bulletin of the American Astronomical Society, Vol. 39, p.1002

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Scientific paper

I report the results of a three-year intensive radial-velocity survey of 22 planet-host stars in search of the low-amplitude (K 5-10 m/s) signals from additional planets which may be "hiding" in the residuals of the known planet orbital solution. On average, more than 40 radial-velocity observations were obtained for each target using the High-Resolution Spectrograph at the 9.2m Hobby-Eberly Telescope (HET). These high-precision data can be used to rule out additional short-period planets in these systems to a detection limit of 10 Earth masses. For one target, our data cannot confirm the existence of the known planet.
In another system, we find evidence for a possible resonance with a second undetected planet. Test particle simulations of these systems with the SWIFT N-body integrator reveal the regions where additional planets could reside in stable orbits. Further simulations with Neptune-mass bodies in these regions are also
performed. We note a lack of short-period "hot Neptune" planets in any of these 22 systems, despite dynamical feasibility. The frequency of low-mass inner planets may be much lower than what was expected based on early discoveries of such objects in systems containing jovian-mass planets. These results lend support to the prediction by Ida & Lin (2004a) that in core-accretion, close-in Neptune-mass planets are rare due to rapid accretion of gas. Planets with masses below the critical gas-accretion mass may be present but as yet undetectable.

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