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Discovery Of A Very Highly Extinguished Supernova In A Luminous Infrared Galaxy

机译：在发光的红外星系中发现极高熄灭的超新星

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摘要

We report the discovery of a confirmed supernova (SN) and a supernova candidate in near-infrared images from the ALTAIR/NIRI adaptive optics system on the Gemini-North Telescope and NICMOS on the Hubble Space Telescope. The Gemini images were obtained as part of a near-infrared K-band search for highly obscured SNe in the nuclear regions of luminous infrared galaxies. SN 2008cs, apparent in the Gemini images, is the first SN discovered using laser guide star adaptive optics. It is located at 1500 pc projected distance from the nucleus of the luminous infrared galaxy IRAS 17138-1017. The SN luminosity, JHK colors, and light curve are consistent with a core-collapse event suffering from a very high host galaxy extinction of 15.7 ± 0.8 mag in the V-band, which is to our knowledge the highest yet measured for a SN. The core-collapse nature of SN 2008cs is confirmed by its radio detection at 22.4 GHz using our Very Large Array observations 28 days after the SN discovery, indicating a prominent interaction of the SN ejecta with the circumstellar medium. An unconfirmed SN apparent in the NICMOS images from 2004 is located in the same galaxy at 660 pc projected distance from the nucleus and has a lower extinction.
机译：我们报告了在双子北望远镜的ALTAIR / NIRI自适应光学系统和哈勃太空望远镜的NICMOS的近红外图像中发现了一个确认的超新星（SN）和超新星候选者。双子星图像是作为近红外K波段搜索的一部分获得的，该搜索是对发光红外星系核区域中高度遮盖的SNe进行的搜索。在双子星图像中显而易见的SN 2008cs是使用激光导星自适应光学技术发现的第一个SN。它距发光红外星系IRAS 17138-1017的原子核投影距离为1500 pc。 SN的光度，JHK颜色和光曲线与核心塌陷事件相一致，核心塌陷事件在V波段的15.7±0.8 mag极高的主星系消光，据我们所知，这是对SN的最高测量。 SN 2008cs的核心塌陷性质通过在发现SN后28天使用我们的超大型阵列观测结果在22.4 GHz进行的无线电探测得以证实，这表明SN射出与周星介质之间存在着显着的相互作用。 2004年NICMOS影像中出现的未经证实的SN位于同一星系中，距原子核的投影距离为660 pc，并且具有较低的消光性。

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