SN 2017egm

SN 2017egm
SN 2017egm imaged by the Nordic Optical Telescope
Event typeSuperluminous supernova
SLSN-I
Date23 May 2017
08:27:12[1]
InstrumentGaia
ConstellationUrsa Major
Right ascension10h 19m 5.62s[2]
Declination+46° 27′ 14.1″[2]
EpochJ2000
Distance411 Mly (126 Mpc)[3]
Redshift0.030721[1]
HostNGC 3191
Peak apparent magnitude+16.72[1]
Other designationsSN 2017egm, Gaia17biu, iPTF17egm, PS18cn[1]
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SN 2017egm (also known as Gaia17biu) is a hydrogen-poor superluminous supernova (SLSN-I) discovered in 2017.[4] It is notable as the closest known SLSN-I at the time of discovery, occurring in the massive spiral galaxy NGC 3191.[5][6]

Discovery

SN 2017egm was discovered on 23 May 2017 by the Gaia telescope at an apparent magnitude of 16.72 in the G-Gaia filter.[4][1] Spectroscopic observations shortly after discovery classified it as a Type I superluminous supernova (SLSN-I).[4] Later studies identified helium features, including strong He Iλ10830 emission and four He I absorption lines, thus reclassifying it within an emerging population of helium-rich SLSNe-I (SLSNe-Ib).[7]

Observation

SN 2017egm exhibits one of the most complex light curves among SLSNe-I.[8] It shows a nearly linear rise to maximum followed by multiple post-peak bumps between 100–350 days after peak.[8] The light curve with multiple post-peak bumps indicates strong indications of interaction with circumstellar material (CSM) and thus may have formed a pulsational pair-instability progenitor two years before the explosion.[8]

References

  1. 1 2 3 4 5 "2017egm | Transient Name Server". www.wis-tns.org. Retrieved 2026-05-11.
  2. 1 2 "SN 2017egm". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-05-11.
  3. ↑ "NGC 3191". NASA/IPAC Extragalactic Database. Retrieved 2026-07-24.
  4. 1 2 3 Bose, Subhash; Dong, Subo; Pastorello, A.; Filippenko, Alexei V.; Kochanek, C. S.; Mauerhan, Jon; Romero-Cañizales, C.; Brink, Thomas G.; Chen, Ping; Prieto, J. L.; Post, R.; Ashall, Christopher; Grupe, Dirk; Tomasella, L.; Benetti, Stefano (2018-01-20). "Gaia17biu/SN 2017egm in NGC 3191: The Closest Hydrogen-poor Superluminous Supernova to Date Is in a "Normal," Massive, Metal-rich Spiral Galaxy". The Astrophysical Journal. 853 (1): 57. arXiv:1708.00864. Bibcode:2018ApJ...853...57B. doi:10.3847/1538-4357/aaa298. ISSN 0004-637X.
  5. ↑ Nicholl, Matt; Berger, Edo; Margutti, Raffaella; Blanchard, Peter K.; Guillochon, James; Leja, Joel; Chornock, Ryan (2017-08-10). "The Superluminous Supernova SN 2017egm in the Nearby Galaxy NGC 3191: A Metal-rich Environment Can Support a Typical SLSN Evolution". The Astrophysical Journal Letters. 845 (1): L8. arXiv:1706.08517. Bibcode:2017ApJ...845L...8N. doi:10.3847/2041-8213/aa82b1. ISSN 2041-8205.
  6. ↑ "NASA's Fermi Glimpses Power Source of Supercharged Supernovae - NASA Science". 2026-05-20. Retrieved 2026-07-26.
  7. ↑ Zhu, Jiazheng; Jiang, Ning; Dong, Subo; Filippenko, Alexei V.; Rudy, Richard J.; Pastorello, A.; Ashall, Christopher; Bose, Subhash; Post, R. S.; Bersier, D.; Benetti, Stefano; Brink, Thomas G.; Chen, Ping; Dou, Liming; Elias-Rosa, N. (2023-05-01). "SN 2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves". The Astrophysical Journal. 949 (1): 23. arXiv:2303.03424. Bibcode:2023ApJ...949...23Z. doi:10.3847/1538-4357/acc2c3. ISSN 0004-637X.
  8. 1 2 3 Lin, Weili; Wang, Xiaofeng; Yan, Lin; Gal-Yam, Avishay; Mo, Jun; Brink, Thomas G.; Filippenko, Alexei V.; Xiang, Danfeng; Lunnan, Ragnhild; Zheng, Weikang; Brown, Peter; Kasliwal, Mansi; Fremling, Christoffer; Blagorodnova, Nadejda; Mirzaqulov, Davron (2023). "A superluminous supernova lightened by collisions with pulsational pair-instability shells". Nature Astronomy. 7 (7): 779–789. arXiv:2304.10416. Bibcode:2023NatAs...7..779L. doi:10.1038/s41550-023-01957-3. ISSN 2397-3366.

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