$ζ^2\,\mathrm{Reticuli}$周围真的有一个碎片盘吗？
Is there really a debris disc around $ζ^2\,\mathrm{Reticuli}$ ?
摘要：
$\mathit{Spitzer}$红外过量探测表明，在Gyr-old太阳型恒星$ζ^2\,\mathrm{Reticuli}$周围存在着一个碎片盘。使用$\mathit{Herschel}$ /PACS进行的随访观察显示了双叶特征，显示亮度和位置不对称。因此，认为椎间盘边缘朝上且明显偏心。在这里，我们提出的ALMA/ACA的观察波段6和7，明确地表明，这些叶没有共同的自行与$ζ^2\,\mathrm{Reticuli}$。在这些观测中，在$ζ^2\,\mathrm{Reticuli}$周围未检测到超过$3σ$水平的通量。我们得出结论，表面亮度上限的碎片盘周围的$ζ^2\,\mathrm{Reticuli}$是$5.7\,\mathrm{μJy/arcsec^2}$在1.3毫米，和$26\,\mathrm{μJy/arcsec^2}$在870微米。我们的研究结果总体上证明了ALMA/ACA跟踪碎片盘的$\mathit{Herschel}$观测并澄清背景混淆的影响的能力。
英文摘要：
The presence of a debris disc around the Gyr-old solar-type star $ζ^2\,\mathrm{Reticuli}$ was suggested by the $\mathit{Spitzer}$ infrared excess detection. Follow-up observations with $\mathit{Herschel}$/PACS revealed a double-lobed feature, that displayed asymmetries both in brightness and position. Therefore, the disc was thought to be edge-on and significantly eccentric. Here we present ALMA/ACA observations in Band 6 and 7 which unambiguously reveal that these lobes show no common proper motion with $ζ^2\,\mathrm{Reticuli}$. In these observations, no flux has been detected around $ζ^2\,\mathrm{Reticuli}$ that exceeds the $3σ$ levels. We conclude that surface brightness upper limits of a debris disc around $ζ^2\,\mathrm{Reticuli}$ are $5.7\,\mathrm{μJy/arcsec^2}$ at 1.3 mm, and $26\,\mathrm{μJy/arcsec^2}$ at 870 microns. Our results overall demonstrate the capability of the ALMA/ACA to follow-up $\mathit{Herschel}$ observations of debris discs and clarify the effects of background confusion.
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