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RADIO OBSERVATIONS OF THE TYPE Ia SUPERNOVA 1986G AS A TEST Of A SYMBIOTIC-STAR PROGENITOR

机译:Ia型超新星1986G的无线电观测作为象征星祖先的试验

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摘要

Searches for prompt radio emission from Type Ia supernovae (SNe Ia) have been proposed as a test of the symbiotic-star progenitor scenario, in which a white dwarf accretes mass from the wind of a companion red giant (Boffi & Branch 1995a). We report the results of a VLA search for radio emission from the Type Ia supernova 1986G in NGC 5128 (Centaurus A), 1 week before its optical maximum. These observations allow us to establish earlier and lower limits on SN Ia radio emission than previously available. Our 3 σ upper limits of 1.0 mJy at 6 cm and 0.7 mJy at 2 cm indicate that the progenitor of SN 1986G probably was not a symbiotic star. SN 1986G was a peculiar Type Ia supernova, and further searches for prompt radio emission from other SNe Ia are needed to more thoroughly test the symbiotic-star progenitor scenario.
机译:已经提出了寻找Ia型超新星(SNe Ia)的即时无线电发射的测试,以测试共生星祖先的情形,在这种情形中,白矮星从伴星红色巨星的风中积聚质量(Boffi&Branch 1995a)。我们报告了VLA搜索NGC 5128(半人马座A)中Ia型超新星1986G的无线电发射的结果,这是光学最大值之前的一周。这些观察结果使我们能够为SN 1a无线电发射建立比以前更早且更低的限制。我们在6 cm处1.0 mJy和2 cm处0.7 mJy的3σ上限表明SN 1986G的祖先可能不是共生星。 SN 1986G是一种奇特的Ia型超新星,需要进一步搜索其他SNe Ia的即时无线电发射,才能更彻底地测试共生星祖先的情况。

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