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Precursor Activity Preceding Interacting Supernovae I: Bridging the Gap with SN 2022mop

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Title: Precursor Activity Preceding Interacting Supernovae I: Bridging the Gap with SN 2022mop
Authors: Brennan, S. J., Bartmentloo, S., Schulze, S., Smith, K. W., Hirai, R., Eldridge, J. J., Fraser, M., Stevance, H. F., Smartt, S. J., Anand, S., Aryan, A., Chen, T. -W., Das, K. K., Drake, A. J., Fransson, C., Gangopadhyay, A., Gkini, A., Jacobson-Galán, W. V., Jerkstrand, A., Johansson, J., Nicholl, M., Pignata, G., Sarin, N., Singh, A., Sollerman, J., Srivastav, S., van Baal, B. F. A., Chambers, K. C., Coughlin, M. W., Gao, H., Graham, M. J., Huber, M. E., Lin, C. -C., Lowe, T. B., Magnier, E. A., Masci, F. J., Purdum, J., Rest, A., Rusholme, B., Smith, R., Smith, I. A., Tweddle, J. W., Wainscoat, R. J., de Boer, T.
Publication Year: 2025
Collection: Astrophysics
Subject Terms: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
More Details: Over the past two decades, an increasing number of transients have shown luminous activity at their explosion sites weeks to years before an interacting supernova (SN) is observed. For some objects, this pre-SN activity is typically linked to large-scale mass-loss events preceding core collapse, yet its triggering mechanism and the underlying explosion process remain uncertain. We present SN 2022mop, which was initially observed in August 2022, exhibiting nebular emission, including [O I], Mg I], and [Ca II], resembling the late-time (~200 days post-explosion) spectrum of a stripped-envelope SN (SESN) from a progenitor with M[ZAMS] < 18 Msun. SN 2022mop shows strong (~ 1 mag) repeating undulations in its light curve, suggesting late-time interaction. In mid-2024, the transient re-brightened for several months before a Type IIn SN (r[peak] = -18.2 mag) was observed in December 2024, closely resembling the evolution of SN 2009ip. By triangulating both transients using Pan-STARRS images, we determine that both transients are coincident within approximately 3 parsecs. Given the environment, the chance alignment of two isolated SNe is unlikely. We propose a merger-burst scenario: a compact object formed in 2022, is kicked into an eccentric orbit, interacts with its hydrogen-rich companion over subsequent months, and ultimately merges, triggering a Type IIn SN-like transient.
Comment: Submitted to A&A. 17 pages, 16 figures, and 3 tables. Data will be uploaded to WISeREP upon acceptance
Document Type: Working Paper
Access URL: http://arxiv.org/abs/2503.08768
Accession Number: edsarx.2503.08768
Database: arXiv
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  Data: Over the past two decades, an increasing number of transients have shown luminous activity at their explosion sites weeks to years before an interacting supernova (SN) is observed. For some objects, this pre-SN activity is typically linked to large-scale mass-loss events preceding core collapse, yet its triggering mechanism and the underlying explosion process remain uncertain. We present SN 2022mop, which was initially observed in August 2022, exhibiting nebular emission, including [O I], Mg I], and [Ca II], resembling the late-time (~200 days post-explosion) spectrum of a stripped-envelope SN (SESN) from a progenitor with M[ZAMS] &lt; 18 Msun. SN 2022mop shows strong (~ 1 mag) repeating undulations in its light curve, suggesting late-time interaction. In mid-2024, the transient re-brightened for several months before a Type IIn SN (r[peak] = -18.2 mag) was observed in December 2024, closely resembling the evolution of SN 2009ip. By triangulating both transients using Pan-STARRS images, we determine that both transients are coincident within approximately 3 parsecs. Given the environment, the chance alignment of two isolated SNe is unlikely. We propose a merger-burst scenario: a compact object formed in 2022, is kicked into an eccentric orbit, interacts with its hydrogen-rich companion over subsequent months, and ultimately merges, triggering a Type IIn SN-like transient.&lt;br /&gt;Comment: Submitted to A&amp;A. 17 pages, 16 figures, and 3 tables. Data will be uploaded to WISeREP upon acceptance
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