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arXiv 1901.01940astro-ph.HEastro-ph.SR
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超新星2017 eaw:来自红外观测的分子和尘埃形成

Supernova 2017eaw: molecule and dust formation from infrared observations

Samaporn Tinyanont, Mansi M Kasliwal, Kelsie Krafton, Ryan Lau, Jeonghee Rho, Douglas C Leonard, Kishalay De, Jacob Jencson, Dimitri Mawet, Maxwell Millar-Blanc… 展开作者

Samaporn Tinyanont, Mansi M Kasliwal, Kelsie Krafton, Ryan Lau, Jeonghee Rho, Douglas C Leonard, Kishalay De, Jacob Jencson, Dimitri Mawet, Maxwell Millar-Blanchaer, Ricky Nilsson, Lin Yan, Robert D Gehrz, George Helou, Schuyler D Van Dyk, Eugene Serabyn, Ori D Fox, Geoffrey Clayton

摘要:

我们介绍了II-P型SN 2017 eaw及其邻近星系NGC 6946中的祖先的红外(IR)光度学和光谱学。在爆炸前1年到1天的4个历元中,KS波段的祖星观测显示,祖星的变化不超过6%,持续时间不超过200天。SN 2017 eaw是一个典型的SN II-P,其近红外和中红外光度演化与SNe 2002 hh和2004 et相似,后者是同一星系中的其他正常SNe II-P。爆炸后389 ~ 480天的光谱监测显示,在389天有强烈的CO第一泛音发射,其谱线轮廓与SN 1987 A的谱线轮廓相匹配,表明CO在1,800 K时有$\sim 10^{-3} \, M_{\odot}$。从389天的历元,直到最近的观察在566天,第一泛音功能褪色,而4.5 $μ$ m的过剩,可能从CO的基本频带,仍然存在。这种行为表明CO没有被破坏,但是气体已经足够冷却,使得负责第一泛音发射的水平不再被填充。最后,斯皮策3.6 $μ$ m测光的演变显示了SN 2017 eaw中尘埃形成的证据,尘埃质量为$10^{-6}$或$10^{-4}\,M_{\odot}$,分别假设碳质或硅酸盐颗粒。

英文摘要:

We present infrared (IR) photometry and spectroscopy of the Type II-P SN 2017eaw and its progenitor in the nearby galaxy NGC 6946. Progenitor observations in the Ks band in 4 epochs from 1 year to 1 day before the explosion reveal no significant variability in the progenitor star greater than 6% that last longer than 200 days. SN 2017eaw is a typical SN II-P with near-IR and mid-IR photometric evolution similar to those of SNe 2002hh and 2004et, other normal SNe II-P in the same galaxy. Spectroscopic monitoring between 389 and 480 days post explosion reveals strong CO first overtone emission at 389 d, with a line profile matching that of SN 1987A from the same epoch, indicating $\sim 10^{-3} \, M_{\odot}$ of CO at 1,800 K. From the 389 d epoch until the most recent observation at 566 d, the first overtone feature fades while the 4.5 $μ$m excess, likely from the CO fundamental band, remains. This behavior indicates that the CO has not been destroyed, but that the gas has cooled enough that the levels responsible for first overtone emissions are no longer populated. Finally, the evolution of Spitzer 3.6 $μ$m photometry shows evidence for dust formation in SN 2017eaw, with a dust mass of $10^{-6}$ or $10^{-4}\,M_{\odot}$ assuming carbonaceous or silicate grains respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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