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arXiv · 2410.07105

Discovery of Two New Eruptions of the Ultrashort Recurrence Time Nova M31N 2017-01e

Allen W. Shafter·Jingyuan Zhao·Kamil Hornoch·Hana Kučáková·Kenta Taguchi·Jiashuo Zhang·Jia You·Binyu Wang·Runwei Xu·Weiye Wang·Yuqing Ren·Lanhe Ding·Xiaochang Yan·Mi Zhang·Wei-Hao Wang·Howard E. Bond·Robert Williams·Gregory R. Zeimann
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Abstract

We report the recent discovery of two new eruptions of the recurrent nova M31N 2017-01e in the Andromeda galaxy. The latest eruption, M31N 2024-08c, reached $R=17.8$ on 2024 August 06.85 UT, $\sim2$ months earlier than predicted. In addition to this recent eruption, a search of archival PTF data has revealed a previously unreported eruption on 2014 June 18.46 UT that reached a peak brightness of $R\sim17.9$ approximately a day later. The addition of these two eruption timings has allowed us to update the mean recurrence time of the nova. We find $\langle T_\mathrm{rec} \rangle = 924.0\pm7.0$ days ($2.53\pm0.02$ yr), which is slightly shorter than our previous determination. Thus, M31N 2017-01e remains the nova with the second shortest recurrence time known, with only M31N 2008-12a being shorter. We also present a low-resolution spectrum of the likely quiescent counterpart of the nova, a $\sim20.5$ mag evolved B star displaying an $\sim14.3$ d photometric modulation.

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Allen W. Shafter, Jingyuan Zhao, Kamil Hornoch, Hana Kučáková, Kenta Taguchi, Jiashuo Zhang, Jia You, Binyu Wang, Runwei Xu, Weiye Wang, Yuqing Ren, Lanhe Ding, Xiaochang Yan, Mi Zhang, Wei-Hao Wang, Howard E. Bond, Robert Williams, Gregory R. Zeimann. 2024-10-09. Discovery of Two New Eruptions of the Ultrashort Recurrence Time Nova M31N 2017-01e. https://arxiv.org/abs/2410.07105

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