# SN 2020oi

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Extragalactic supernova in 2020

SN 2020oi 2020 light curves for SN 2020oi in four photometric bands, adapted from Rho et al. (2021)[1] Event type Supernova Type Ic[2] Discovered January 7, 2020[2] Instrument ZTF[3] Constellation Coma Berenices Right ascension 12h 22m 54.925s[3] Declination +15° 49′ 25.05″[3] Epoch J2000 Distance 46 Mly (14 Mpc)[2] Redshift 0.0052 Host Messier 100[2] Progenitor type Envelope-stripped massive star[1] Peak apparent magnitude 17.28[3] Total energy output ~1051 erg[1] [edit on Wikidata]

**SN 2020oi** was a [supernova](/source/Supernova) event in the [grand design spiral galaxy](/source/Grand_design_spiral_galaxy) known as [Messier 100](/source/Messier_100), or NGC 4321. It was discovered January 7, 2020 at an [apparent magnitude](/source/Apparent_magnitude) of 17.28 by F. Forster and associates using the [Zwicky Transient Facility](/source/Zwicky_Transient_Facility). The position places it ~4.67[″](/source/Second_of_arc) north of the [galactic nucleus](/source/Galactic_nucleus).[4] The supernova was not detected on an observation made three days before the discovery, and thus it must have begun during that brief period.[2] The [light curve](/source/Light_curve) peaked around January 13–18, depending on the [wavelength](/source/Wavelength), then declined rapidly over a period of 25 days before flattening into a more gradual decline.[1] Observations of the [spectrum](/source/Stellar_spectrum) made with the [SOAR telescope](/source/Southern_Astrophysical_Research_Telescope) showed this to be a [type Ic supernova](/source/Type_Ic_supernova), with the progenitor being a massive star that had its outer envelope stripped. The initial velocity of the expanding [photosphere](/source/Photosphere) was ~15,000 km/s.[2]

Models of the event give an initial ([zero age main sequence](/source/Zero_age_main_sequence)) estimated mass of 9.5±1.0 [*M*☉](/source/Solar_mass)[4] or 13 [*M*☉](/source/Solar_mass)[1] for the progenitor. It was a member of a [binary star](/source/Binary_star) system and lost its outer envelope of hydrogen and helium due to interaction with its companion. The resulting helium-poor star was primarily made of carbon and oxygen with a mass of about 2.16 *M*☉. The supernova explosion was the result of a collapse of an inert iron [core](/source/Stellar_core). The event ejected 0.71 *M*☉ of material and left behind a [neutron star](/source/Neutron_star) remnant with a presumed mass of 1.45 *M*☉. The explosion released about 1051 [erg](/source/Erg) of energy, of which 60% was expended on [kinetic energy](/source/Kinetic_energy).[1]

This is one of the few type Ic supernovae for which [radio](/source/Radio_astronomy) emission has been detected. Based on this data, the [shock wave](/source/Shock_wave) from the explosion advanced through the surrounding interstellar matter with a velocity of 3−4×104 km/s. In order to produce the observed emission, the progenitor star underwent mass loss at an average rate of 1.4×10−4 *M*☉·yr−1 at a typical wind velocity of ~1,000 km/s.[2] Images of the location taken prior to the event using the [Hubble Space Telescope](/source/Hubble_Space_Telescope) show a [stellar cluster](/source/Stellar_cluster) at that location.[4]

## References

1. ^ [***a***](#cite_ref-Rho_et_al_2021_1-0) [***b***](#cite_ref-Rho_et_al_2021_1-1) [***c***](#cite_ref-Rho_et_al_2021_1-2) [***d***](#cite_ref-Rho_et_al_2021_1-3) [***e***](#cite_ref-Rho_et_al_2021_1-4) [***f***](#cite_ref-Rho_et_al_2021_1-5) Rho, J.; et al. (February 2021), "Near-infrared and Optical Observations of Type Ic SN 2020oi and Broad-lined Type Ic SN 2020bvc: Carbon Monoxide, Dust, and High-velocity Supernova Ejecta", *The Astrophysical Journal*, **908** (2): 21, [arXiv](/source/ArXiv_(identifier)):[2010.00662](https://arxiv.org/abs/2010.00662), [Bibcode](/source/Bibcode_(identifier)):[2021ApJ...908..232R](https://ui.adsabs.harvard.edu/abs/2021ApJ...908..232R), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/abd850](https://doi.org/10.3847%2F1538-4357%2Fabd850), [S2CID](/source/S2CID_(identifier)) [222125057](https://api.semanticscholar.org/CorpusID:222125057), 232.

1. ^ [***a***](#cite_ref-Horesh_et_al_2020_2-0) [***b***](#cite_ref-Horesh_et_al_2020_2-1) [***c***](#cite_ref-Horesh_et_al_2020_2-2) [***d***](#cite_ref-Horesh_et_al_2020_2-3) [***e***](#cite_ref-Horesh_et_al_2020_2-4) [***f***](#cite_ref-Horesh_et_al_2020_2-5) [***g***](#cite_ref-Horesh_et_al_2020_2-6) Horesh, Assaf; et al. (November 2020), "A Non-equipartition Shock Wave Traveling in a Dense Circumstellar Environment around SN 2020oi", *The Astrophysical Journal*, **903** (2): 15, [arXiv](/source/ArXiv_(identifier)):[2006.13952](https://arxiv.org/abs/2006.13952), [Bibcode](/source/Bibcode_(identifier)):[2020ApJ...903..132H](https://ui.adsabs.harvard.edu/abs/2020ApJ...903..132H), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/abbd38](https://doi.org/10.3847%2F1538-4357%2Fabbd38), [S2CID](/source/S2CID_(identifier)) [220055590](https://api.semanticscholar.org/CorpusID:220055590), 132.

1. ^ [***a***](#cite_ref-TNS_3-0) [***b***](#cite_ref-TNS_3-1) [***c***](#cite_ref-TNS_3-2) [***d***](#cite_ref-TNS_3-3) ["SN 2020oi"](https://www.wis-tns.org/object/2020oi), *Transient Name Server*, retrieved 2022-01-20.

1. ^ [***a***](#cite_ref-Gagliano_et_al_2022_4-0) [***b***](#cite_ref-Gagliano_et_al_2022_4-1) [***c***](#cite_ref-Gagliano_et_al_2022_4-2) Gagliano, Alexander; et al. (January 2022), "An Early-time Optical and Ultraviolet Excess in the Type-Ic SN 2020oi", *The Astrophysical Journal*, **924** (2): 29, [arXiv](/source/ArXiv_(identifier)):[2105.09963](https://arxiv.org/abs/2105.09963), [Bibcode](/source/Bibcode_(identifier)):[2022ApJ...924...55G](https://ui.adsabs.harvard.edu/abs/2022ApJ...924...55G), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ac35ec](https://doi.org/10.3847%2F1538-4357%2Fac35ec), [S2CID](/source/S2CID_(identifier)) [235125935](https://api.semanticscholar.org/CorpusID:235125935), 55.

## Further reading

- Dutta, Anirban; et al. (January 2020), "Optical spectrum of SN 2020oi (ZTF20aaelulu)", *The Astronomer's Telegram*, **13404** (13404): 1, [Bibcode](/source/Bibcode_(identifier)):[2020ATel13404....1D](https://ui.adsabs.harvard.edu/abs/2020ATel13404....1D).

- Horesh, A.; Sfaradi, I. (January 2020), "An Initial Analysis of the VLA Observation of the Nearby Supernova SN2020oi in M100", *The Astronomer's Telegram*, **13398** (13398): 1, [Bibcode](/source/Bibcode_(identifier)):[2020ATel13398....1H](https://ui.adsabs.harvard.edu/abs/2020ATel13398....1H).

- Sfaradi, Itai; et al. (January 2020), "AMI-LA 15.5 GHz Observations of the Nearby Supernova SN2020oi", *The Astronomer's Telegram*, **13401** (13401): 1, [Bibcode](/source/Bibcode_(identifier)):[2020ATel13401....1S](https://ui.adsabs.harvard.edu/abs/2020ATel13401....1S).

- Moldon, J.; et al. (February 2020), "e-MERLIN radio detection of SN 2020oi at 5 GHz", *The Astronomer's Telegram*, **13448** (13448): 1, [Bibcode](/source/Bibcode_(identifier)):[2020ATel13448....1M](https://ui.adsabs.harvard.edu/abs/2020ATel13448....1M).

- Maeda, Keiichi; et al. (June 22, 2021), ["The Final Months of Massive Star Evolution from the Circumstellar Environment around SN Ic 2020oi"](https://doi.org/10.3847%2F1538-4357%2Fac0dbc), *The Astrophysical Journal*, **918** (1): 34, [arXiv](/source/ArXiv_(identifier)):[2106.11618](https://arxiv.org/abs/2106.11618), [Bibcode](/source/Bibcode_(identifier)):[2021ApJ...918...34M](https://ui.adsabs.harvard.edu/abs/2021ApJ...918...34M), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ac0dbc](https://doi.org/10.3847%2F1538-4357%2Fac0dbc), [S2CID](/source/S2CID_(identifier)) [235592953](https://api.semanticscholar.org/CorpusID:235592953)

- Tinyanont, Samaporn; et al. (2021), "Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova", *Nature Astronomy*, **5** (6): 544–551, [arXiv](/source/ArXiv_(identifier)):[2102.02075](https://arxiv.org/abs/2102.02075), [Bibcode](/source/Bibcode_(identifier)):[2021NatAs...5..544T](https://ui.adsabs.harvard.edu/abs/2021NatAs...5..544T), [doi](/source/Doi_(identifier)):[10.1038/s41550-021-01320-4](https://doi.org/10.1038%2Fs41550-021-01320-4), [S2CID](/source/S2CID_(identifier)) [231786458](https://api.semanticscholar.org/CorpusID:231786458).

v t e Supernovae Classes Type Ia Iax Type Ib and Ic Type II Hypernova Superluminous Pair-instability Calcium-rich Common envelope jets Physics of Carbon detonation Foe/Bethe Near-Earth Phillips relationship Nucleosynthesis p-process r-process γ-process Neutrinos Related Failed Fast blue optical transient Fast radio burst Gamma-ray burst Gravitational wave Kilonova Luminous red nova Micronova Nova Pulsar kick Quark-nova Soft gamma repeater Imposter pulsational pair-instability Symbiotic nova Progenitors Hypergiant yellow Luminous blue variable Supergiant blue red yellow White dwarf Wolf–Rayet star Super-AGB star Population III star Remnants Supernova remnant Pulsar wind nebula Neutron star pulsar magnetar Stellar black hole Compact star electroweak exotic quark Zombie star Local Bubble Superbubble Orion–Eridanus Discovery Guest star History of supernova observation Timeline of white dwarfs, neutron stars, and supernovae Lists Candidates Notable Massive stars Most distant Remnants In fiction Notable Barnard's Loop Cassiopeia A SN 1054 Crab Nebula iPTF14hls SN 1000+0216 Tycho's Kepler's SN 1885A SN 1987A SN 1994D SN 185 SN 1006 SN 2003fg Remnant G1.9+0.3 SN 2007bi SN 2011fe SN 2014J SN Eos SN Refsdal Vela Remnant SN 2006gy ASASSN-15lh SN 2016aps SN 2018cow SN 2022jli SN H0pe Research ASAS-SN Calán/Tololo Survey High-Z Supernova Search Team Katzman Automatic Imaging Telescope Monte Agliale Supernovae and Asteroid Survey Nearby Supernova Factory Sloan Supernova Survey Supernova/Acceleration Probe Supernova Cosmology Project SuperNova Early Warning System Supernova Legacy Survey Texas Supernova Search Category:Supernovae Commons:Supernovae

v t e Constellation of Coma Berenices List of stars in Coma Berenices Coma Berenices in Chinese astronomy Stars Bayer α (Diadem) β γ Flamsteed 7 11 12 13 14 16 17 21 23 (Phyllon Kissinou) 24 31 35 36 37 41 Variable FK GP IN LW HR 4668 HD 107146 108863 108874 110067 114762 b 115404 116029 Other 2MASS J12195156+3128497 KELT-6 WASP-56 WISE 1217+1626 Exoplanets HD 108874 b c KELT-6b Star clusters Coma Star Cluster Messier 53 NGC 4147 NGC 5053 Nebulae LoTr 5 Galaxies Messier 64 (Black Eye Galaxy) 85 88 91 98 99 100 NGC 4014 4015 4017 4053 4056 4060 4061 4065 4066 4070 4072 4074 4076 4084 4086 4089 4090 4091 4092 4093 4095 4098 4136 4146 4150 4162 4185 4189 4203 4211 4212 4213 4222 4237 4245 4253 4262 4274 4278 4293 4298 4302 4308 4310 4312 4314 4323 4328 4340 4359 4375 4383 4393 4394 4414 4419 4448 4450 4455 4459 4468 4473 4474 4475 4477 4479 4489 4494 4495 4498 4502 4506 4515 4516 4523 4525 4540 4555 4556 4558 4559 4561 4565 4571 4585 4595 4611 4614 4615 4633 4634 4651 4659 4670 4673 4676 (Mice Galaxies) 4689 4692 4710 4712 4725 4747 4839 4848 4860 4869 4871 4872 4873 4874 4875 4876 4881 4883 4886 4889 4892 4895 4907 4911 4919 4921 4944 5000 5004 5012 5032 5056 5172 Other 3C 275.1 3C 287 Arp 60 Coma Berenices Dragonfly 44 IC 755 (NGC 4019) IC 831 IC 860 IC 3505 IC 3528 IC 4040 IC 4051 IOK-1 IRAS F12032+1707 LEDA 83677 M85-HCC1 Malin 1 PGC 44691 PKS 1155+251 PKS 1222+216 VIRGOHI21 ZwCl 1305.4+2941 BCG Galaxy clusters Abell 1413 Coma I Coma Cluster Coma Supercluster M94 Group NGC 4065 Group NGC 4631 Group Astronomical events GRB 050509B iPTF14atg SN 1940B SN 1979C SN 2005ap SN 2006X SN 2020oi Category

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Adapted from the Wikipedia article [SN 2020oi](https://en.wikipedia.org/wiki/SN_2020oi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/SN_2020oi?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.