DRAFT
2025-01-04 10:58:58
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN...2....1S
AT2022mop: a rapidly rising SN candidate with a long-lived and luminous precursor
Authors: S. Srivastav, H. Stevance (Oxford), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, A. Aamer, C. R. Angus, D. Magill (QUB), P. Ramsden (QUB/Birmingham), L. Shingles (GSI/QUB), J. Gillanders, A. J. Cooper, F. Stoppa (Oxford), L. Rhodes (TSI/McGill), T.-W. Chen (NCU), L. Denneau, J. Tonry, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), A. Rest (STScI), C. Stubbs (Harvard), J. Sommer (LMU), B. P. Schmidt (ANU), K. C. Chambers , M. E. Huber, A. S. B. Schultz, T. de Boer, J. Herman, J. Fairlamb, H. Gao, C. C. Lin, T. Lowe, E. Magnier, P. Minguez, I. A. Smith, R. J. Wainscoat (IfA, Univ. Hawaii)
Source Group: ATLAS
Keywords: Supernova, Transient, Optical, Photometry
Abstract:
We report the rapidly rising ATLAS light curve of the transient AT2022mop, initially discovered by Pan-STARRS2 in 2022. Forced photometry history in Pan-STARRS, ZTF and ATLAS shows evidence for multiple precursor outbursts at absolute magnitudes between ~ -12.5 to ~ -15, preceding the recent rapid re-brightening. AT2022mop is likely the terminal supernova explosion followed by multiple precursor outbursts, spectroscopic classification is encouraged.

We report the the re-emergence of the rapidly rising transient AT2022mop. The latest outburst was flagged by the ATLAS transient science server on MJD 60674.20 (2024-12-30.20) at o = 18.43 ± 0.13, and has since brightened to o = 16.84 ± 0.06 on MJD 60678.20, rising at a rate of 0.4 mag per day. The transient was initially discovered ~ 2.5 years ago on MJD 59741.58 (2022-06-11.58) by Pan-STARRS2 (PS2), at w = 20.45 ± 0.16 (TNS Astronomical Transient Report No. 150157). The host galaxy is IC 1496 at z = 0.017 (D = 73 Mpc), implying an absolute magnitude of M_w = -14.0 ± 0.2 at discovery.

Following the initial PS2 discovery, the forced photometry history in PS1 and PS2 shows evidence of multiple precursor outbursts, fluctuating between w = 21 and 22 mag, or absolute magnitudes of M_w ~ -12.5 to -13.5. Recent history in ZTF (through the Lasair alert broker, Williams et al. 2024) and ATLAS shows a more luminous precursor (M ~ -15) during the weeks leading up to the recent re-brightening. Given the current absolute magnitude of M_o ~ -17.5 and the rising light curve, ATLAS24saw is possibly the terminal explosion of a massive, restless progenitor with multiple mass-loss episodes during the years preceding explosion. Spectroscopic classification and further followup is encouraged.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2022mop [PS22fhf] 23:30:51.220 -02:56:33.90 0.017 IC 1496 0.016985 23:30:51.220 -02:56:33.90 SN IIn 0.017219

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