VISIBILITY STACKING IN THE QUEST FOR TYPE Ia SUPERNOVA RADIO EMISSION
VISIBILITY STACKING IN THE QUEST FOR TYPE Ia SUPERNOVA RADIO EMISSION
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DOI：
10.1088/2041-8205/735/2/l35
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
P. P. Hancock-P.;B. Gaensler;T. Murphy
中科院分区：
文献类型：
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作者：
P. P. Hancock-P.;B. Gaensler;T. Murphy
我们描述了叠加无线电干涉测量可见性以形成深层合成图像的过程及其在瞬态现象观察中的应用。我们将“可见度叠加”应用于附近 Ia 型超新星 (SNeIa) 的 46 个档案甚大阵列观测。这种新方法为 5 GHz 下的 SNIa 系综峰值无线电光度提供了 1.2 × 1025 erg s−1 Hz−1 的上限，比之前测量的低 5-10 倍。这个光度意味着平均伴星风质量损失率的上限为 1.3 × 10−7 M☉ yr−1。这种质量损失率与 SNeIa 的双简并情景一致，并排除了单简并情景中的中质量和高质量伴星。在时域天文学时代，可见度叠加等技术对于从短暂事件群体的观测中提取最大量的信息非常重要。
We describe the process of stacking radio interferometry visibilities to form a deep composite image and its application to the observation of transient phenomena. We apply “visibility stacking” to 46 archival Very Large Array observations of nearby type Ia supernovae (SNeIa). This new approach provides an upper limit on the SNIa ensemble peak radio luminosity of 1.2 × 1025 erg s−1 Hz−1 at 5 GHz, which is 5–10 times lower than previously measured. This luminosity implies an upper limit on the average companion stellar wind mass-loss rate of 1.3 × 10−7 M☉ yr−1. This mass-loss rate is consistent with the double degenerate scenario for SNeIa and rules out intermediate- and high-mass companions in the single degenerate scenario. In the era of time domain astronomy, techniques such as visibility stacking will be important in extracting the maximum amount of information from observations of populations of short-lived events.