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arXiv · 1907.01633

HSC16aayt: Slowly evolving interacting transient rising for more than 100 days

Takashi J. Moriya·Masaomi Tanaka·Tomoki Morokuma·Yen-Chen Pan·Robert M. Quimby·Ji-an Jiang·Kojiro Kawana·Keiichi Maeda·Ken'ichi Nomoto·Nao Suzuki·Ichiro Takahashi·Masayuki Tanaka·Nozomu Tominaga·Masaki Yamaguchi·Naoki Yasuda·Jeff Cooke·Chris Curtin·Lluis Galbany·Santiago Gonzalez-Gaitan·Chien-Hsiu Lee·Giuliano Pignata·Tyler Pritchard
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Abstract

We report our observations of HSC16aayt (SN 2016jiu), which was discovered by the Subaru/Hyper Suprime-Cam (HSC) transient survey conducted as part of Subaru Strategic Program (SSP). It shows very slow photometric evolution and its rise time is more than 100 days. The optical magnitude change in 400 days remains within 0.6 mag. Spectra of HSC16aayt show a strong narrow emission line and we classify it as a Type IIn supernova. The redshift of HSC16aayt is 0.6814 +/- 0.0002 from the spectra. Its host galaxy center is at 5 kpc from the supernova location and HSC16aayt might be another example of isolated Type IIn supernovae, although the possible existence of underlying star forming activity of the host galaxy at the supernova location is not excluded.

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Takashi J. Moriya, Masaomi Tanaka, Tomoki Morokuma, Yen-Chen Pan, Robert M. Quimby, Ji-an Jiang, Kojiro Kawana, Keiichi Maeda, Ken'ichi Nomoto, Nao Suzuki, Ichiro Takahashi, Masayuki Tanaka, Nozomu Tominaga, Masaki Yamaguchi, Naoki Yasuda, Jeff Cooke, Chris Curtin, Lluis Galbany, Santiago Gonzalez-Gaitan, Chien-Hsiu Lee, Giuliano Pignata, Tyler Pritchard. 2019-07-02. HSC16aayt: Slowly evolving interacting transient rising for more than 100 days. https://doi.org/10.3847/1538-4357%2Fab2f80

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