Discovery of Two New Eruptions of the Ultrashort Recurrence Time Nova M31N 2017-01e
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, 2 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 R17.9 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 Trec = 924.07.0 days (2.530.02 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 20.5 mag evolved B star displaying an 14.3 d photometric modulation.
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