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Radio Emission from the Exoplanetary System ? Eridani

机译:系外系统的无线电发射?江谷

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As part of a wider search for radio emission from nearby systems known or suspected to contain extrasolar planets, Eridani was observed by the Jansky Very Large Array (VLA) in the 2–4 GHz and 4–8 GHz frequency bands. In addition, as part of a separate survey of thermal emission from solar-like stars, Eri?was observed in the 8–12 GHz and the 12–18 GHz bands of the VLA. Quasi-steady continuum radio emission from Eri?was detected in the three high-frequency bands at levels ranging from 67 to 83 μJy. No significant variability is seen in the quasi-steady emission. The emission in the 2–4 GHz emission, however, is shown to be the result of a circularly polarized (up to 50%) radio pulse or flare of a few minutes in duration that occurred at the beginning of the observation. We consider the astrometric position of the radio source in each frequency band relative to the expected position of the K2V star and the purported planet. The quasi-steady radio emission at frequencies ≥8 GHz is consistent with a stellar origin. The quality of the 4–8 GHz astrometry provides no meaningful constraint on the origin of the emission. The location of the 2–4 GHz radio pulse is >2.5σ from the star; however, based on the ephemeris of Benedict et al., it is not consistent with the expected location of the planet either. If the radio pulse has a planetary origin, then either the planetary ephemeris is incorrect or the emission originates from another planet.
机译:作为对附近已知或怀疑包含太阳系外行星的无线电发射进行更广泛搜索的一部分,Eridani在2–4 GHz和4–8 GHz频带被Jansky超大型阵列(VLA)观测到。此外,作为对太阳类恒星热辐射的单独调查的一部分,在VLA的8–12 GHz和12–18 GHz频带中观测到了Eri?。在三个高频频段中,从Eri?发出的准稳态连续无线电发射在67至83μJy范围内被检测到。在准稳态发射中没有发现明显的变化。但是,在2–4 GHz发射中的发射是观察到开始时发生的持续时间为几分钟的圆极化(高达50%)无线电脉冲或耀斑的结果。我们考虑相对于K2V恒星和声称的行星的预期位置,每个频段中无线电源的天文位置。频率≥8GHz的准稳定无线电发射与恒星起源一致。 4–8 GHz天文测量的质量对发射源没有任何有意义的限制。 2–4 GHz无线电脉冲的位置距恒星>2.5σ。然而,根据本尼迪克特等人的星历表,这也不符合行星的预期位置。如果无线电脉冲的起源是行星,则行星星历表不正确,或者发射源于另一个行星。

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