Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz-猫眼课题宝

DOI：

10.3847/1538-4357/ac74b9

发表时间：

2021-09

期刊：

The Astrophysical Journal

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通讯作者：

中科院分区：

其他

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作者：

T. Holoien;J. Neustadt;P. Vallely;K. Auchettl;J. Hinkle;C. Romero-Cañizales;B. Shappee;C. Kochanek;K. Stanek;Ping Chen;S. Dong;J. Prieto;T. Thompson;T. Brink;A. Filippenko;Wei Zheng;D. Bersier;S. Bose;A. Burgasser;S. Channa;T. de Jaeger;J. Hestenes;M. Im;Benjamin T. Jeffers;H. Jun;G. Lansbury;R. Post;Timothy Ross;D. Stern;Kevin Tang;M. Tucker;S. Valenti;Sameen Yunus;Keto D. Zhang

我们目前的观测非常明亮，但模糊的核瞬变（ANT）ASASSN-17 jz，跨越大约1200天的对象的演变。ASASSN-17 jz是由全天空超新星自动巡天（ASAS-SN）于UT 2017年7月27日在SDSS J171955.84+414049.4星系中发现的，红移为z = 0.1641。瞬变的峰值在B波段绝对星等M B，峰值= −22.81，对应的辐射热光度L bol，峰值= 8.3 × 1044 erg s−1，并显示出在我们最近的观测中仍在进行的晚期紫外辐射。对全光变曲线进行积分得到总发射能量E tot =（1.36 ±0.08）× 1052 erg，其中（0.80 ± 0.02）× 1052 erg是在峰值光的200天内发射的。这种后期紫外线发射伴随着X射线发射的增加，随着它变亮而变得更柔和。ASASSN-17 jz表现出大量的光谱发射线，这些线在活动星系核（AGN）中最常见，但几乎没有演化的证据。它还显示了短暂的巴耳末特征，随着时间的推移变得越来越模糊和广泛，并且在峰值亮度之后超过1000天仍然可以检测到。我们考虑各种物理场景的起源的瞬态，包括超新星（SNe），潮汐破坏事件，活动星系核爆发，和ANTs。我们发现，最可能的解释是，ASASSN-17 jz是一个SN IIn发生在或接近现有的活动星系核的磁盘，和后期的时间发射是由活动星系核过渡到一个更活跃的状态。

We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object’s evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0.1641. The transient peaked at an absolute B-band magnitude of M B,peak = −22.81, corresponding to a bolometric luminosity of L bol,peak = 8.3 × 1044 erg s−1, and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of E tot = (1.36 ±0.08) × 1052 erg, with (0.80 ± 0.02) × 1052 erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features, which became fainter and broader over time, and are still being detected >1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events, AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was a SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state.

Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz

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