Gliese 876多行星系统中存在碎片盘的进一步限制
Further Constraints on the Presence of a Debris Disk in the Multiplanet System Gliese 876
摘要：
我们用7毫米波段的甚大望远镜阵（VLA）和3毫米波段的澳大利亚望远镜紧凑阵（ATCA），对太阳系外行星系统Gliese 876（Gl 876）中冷尘埃的微波辐射进行了探测。由于没有检测到超过我们的3-sigma检测阈值135 microJy的发射，我们排除了任何质量大于0.0006地球质量或小于250 AU的尘埃盘。这一结果提高了以前的检测孔径阈值的数量级更大，它有一些影响系统的动态建模。这也与格里夫斯等人的假设相一致，该假设将碎片盘的存在与近距离行星联系起来。由于尘埃-微行星的关系，我们的零结果也可能对附近M矮星周围的尘埃和小天体的数量或组成提供限制。
英文摘要：
Using both the Very Large Array (VLA) at 7mm wavelength, and the Australia Telescope Compact Array (ATCA) at 3mm, we have searched for microwave emission from from cool dust in the extrasolar planetary system Gliese 876 (Gl 876). Having detected no emission above our 3-sigma detection threshold of 135 microJy, we rule out any dust disk with either a mass greater than 0.0006 Earth masses or less than ~250 AU across. This result improves on previous detection aperture thresholds an order of magnitude greater, and it has some implications for the dynamical modeling of the system. It also is consistent with the Greaves et al. hypothesis that relates the presence of a debris disk to close-in planets. Due to the dust-planetesimal relationship, our null result may also provide a constraint on the population or composition of the dust and small bodies around this nearby M dwarf.
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