We present the detections of three multiple systems within the HARPS volume-limited sample. Among the six planets discussed in this paper, we have identified a “super-Earth” planet with a minimum mass of 6.6 MEarth and a “Neptune” planet with minimum mass of 18 MEarth, both orbiting their parent stars within a distance of 0.05 AU and a period of approximately four days. These detections strengthen the argument that low-mass planets are primarily found in multiple-planetary systems.
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Curto et al. (2010) studied this question.
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