Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
| Autor: | Junqiang Zhang, Jozsef Vinko, Paul S. Smith, Daniel E. Reichart, Saurabh Jha, Hanna Sai, Iair Arcavi, Griffin Hosseinzadeh, Peter Milne, X. Zhang, Sheng Yang, M. Lundquist, D. K. Sahu, Eiichi Egami, G. C. Anupama, Y. Dong, Dan Milisavljevic, S. D. Van Dyk, Curtis McCully, K. A. Bostroem, D. A. Howell, Alexei V. Filippenko, Nathan Smith, Peter J. Brown, Steve Ertel, E. Baron, R. Cartier, X. F. Wang, David Pooley, J. M. Derkacy, Avinash Singh, S. Wyatt, D. J. Sand, Vladimir Kouprianov, O. D. Fox, John C Wheeler, J. B. Haislip, Raya Dastidar, Yun Wang, Jennifer E. Andrews, Daichi Hiramatsu, G. Grant Williams, Kuntal Misra, Renata Cecília Amaro, S. Valenti, Lluís Galbany, Brajesh Kumar, Anjasha Gangopadhyay, Jamison Burke |
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| Rok vydání: | 2019 |
| Předmět: |
H II region
010504 meteorology & atmospheric sciences FOS: Physical sciences Astrophysics 01 natural sciences Spectral line Circumstellar gas 0103 physical sciences Core-collapse supernovae Emission spectrum Ejecta 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Physics Type II supernovae High Energy Astrophysical Phenomena (astro-ph.HE) COSMIC cancer database Astronomy and Astrophysics Animation Light curve Machine-readable table Supernova Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics - High Energy Astrophysical Phenomena Equivalent width |
| Zdroj: | The Astrophysical Journal Digibug: Repositorio Institucional de la Universidad de Granada Universidad de Granada (UGR) Digibug. Repositorio Institucional de la Universidad de Granada instname |
| ISSN: | 0004-637X 0004-6361 1538-3873 0067-0049 1538-3881 1286-4846 0944-9833 |
| DOI: | 10.48550/arxiv.1909.07304 |
| Popis: | We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual Type II supernova that exploded in NGC 1068 (D=10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope frequently, with four clear slope changes in the first 30 days of evolution. This rapidly changing light curve indicates that interaction between the circumstellar material and ejecta plays a significant role in the evolution. Circumstellar interaction is further supported by a strong X-ray detection. The spectra are rapidly evolving and dominated by hydrogen, helium, and calcium emission lines. We identify a rare high-velocity emission-line feature blueshifted at ~7800 km/s (in Ha, Hb, Pb, Pg, HeI, CaII), which is visible from day 18 until at least day 78 and could be evidence of an asymmetric progenitor or explosion. From the overall similarity between SN 2018ivc and SN 1996al, the \Ha{} equivalent width of its parent HII region, and constraints from pre-explosion archival Hubble Space Telescope images, we find that the progenitor of SN 2018ivc could be as massive as 52 Msun but is more likely Accepted by ApJ. Revised version includes more extensive progenitor analysis |
| Databáze: | OpenAIRE |
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