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The THU-NAOC Transient Survey: the Performance and the First-year Result

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arxiv 1411.3431 v1 pith:SP5SZ6NQ submitted 2014-11-13 astro-ph.IM astro-ph.HE

The THU-NAOC Transient Survey: the Performance and the First-year Result

Tianmeng Zhang , Xiaofeng Wang , Junchen Chen , Jujia Zhang , Li Zhou , Wenxiong Li , Qing Liu , Jun Mo
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Kaicheng Zhang Xinyu Yao Xulin Zhao Xu Zhou Jundan Nie Fang Huang Zhaoji Jiang Jun Ma Lingzhi Wang Chao Wu Zhimin Zhou Hu Zou Lifan Wang
This is my paper
classification astro-ph.IM astro-ph.HE
keywords surveynaocperformancetransientastronomicalautomaticcadencechina
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The Tsinghua University-National Astronomical Observatories of China (NAOC) Transient Survey (TNTS) is an automatic survey for a systematic exploration of optical transients (OTs), conducted with a 60/90 cm Schmidt telescope at Xinglong station of NAOC. This survey repeatedly covers ~ 1000 square degrees of the north sky with a cadence of 3-4 days. With an exposure of 60 s, the survey reaches a limited unfiltered magnitude of about 19.5 mag. This enables us to discover supernovae at their relatively young stages. In this paper, we describe the overall performance of our survey during the first year and present some preliminary results.

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    In SN 2021fxy, the high-velocity Si II λ6355 absorption declines as roughly t^−0.1, much shallower than the t^−0.22 expected from standard outer ejecta, pointing to detached density structures.