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SN 1998S was a type IIn supernova that was observed in NGC 3877 in March 1998. SN 1998S was the brightest type IIn event observed .[2]
 R-band image of SN 1998S in NGC 3877 obtained on 1998 March 16.1 ut at t he Jacobus Kapteyn Telescope (JKT), La Palma (north is up and east is to the left).[1] | |
| Event type | Supernova  |
|---|---|
| IIn | |
| Date | March 2, 1998 by Z. Wan. |
| Constellation | Ursa Major |
| Right ascension | 11h 46m 06.25s |
| Declination | +47° 28' 55.5 |
| Epoch | J2000.0 |
| Galactic coordinates | 150.7467 +65.9637 |
| Distance | 17 Mpc |
| Host | NGC 3877 |
| Progenitor | Unknown |
| Progenitor type | maybe Red supergiant |
| Colour (B-V) | ~ 0.2 mag |
| Notable features | SN 1998S, AAVSO 1140+48 |
| Peak apparent magnitude | 12 mag |
| Other designations | SN 1998S, 2MASS J11460613+4728553, AAVSO 1140+48 |
It was discovered on 1998 March 2.68 UT in NGC 3877 by Z. Wan at a broadband (unfiltered) optical magnitude of +15.2.
Its spectrum showed prominent H and He emission lines with narrow peaks and broad wings, superimposed on a blue continuum. These narrow lines indicate the presence of a dense circumstellar medium (CSM) in the vicinity of the supernova. The high luminosity of SN1998S is due to the interaction of fast material (ejecta) with previously-expelled slowly-expanding material (CSM), which can more effectively convert kinetic energy of ejecta into radiation energy.[3]
References
- Fassia, A.; Meikle, W. P. S.; Vacca, W. D.; Kemp, S. N.; Walton, N. A.; Pollacco, D. L.; Smartt, S.; Oscoz, A.; Aragon-Salamanca, A.; Bennett, S.; Hawarden, T. G.; Alonso, A.; Alcalde, D.; Pedrosa, A.; Telting, J.; Arevalo, M. J.; Deeg, H. J.; Garzon, F.; Gomez-Roldan, A.; Gomez, G.; Gutierrez, C.; Lopez, S.; Rozas, M.; Serra-Ricart, M.; Zapatero-Osorio, M. R. (11 November 2000). "Optical and infrared photometry of the Type IIn SN 1998S: days 11-146". Monthly Notices of the Royal Astronomical Society. 318 (4): 1093–1104. arXiv:astro-ph/0006080. Bibcode:2000MNRAS.318.1093F. doi:10.1046/j.1365-8711.2000.03797.x. S2CID 3073301.
- Fassia, A.; Meikle, W. P. S.; Chugai, N.; Geballe, T. R.; Lundqvist, P.; Walton, N. A.; Pollacco, D.; Veilleux, S.; Wright, G. S.; Pettini, M.; Kerr, T.; Puchnarewicz, E.; Puxley, P.; Irwin, M.; Packham, C.; Smartt, S. J.; Harmer, D. (11 August 2001). "Optical and infrared spectroscopy of the type IIn SN 1998S: days 3-127". Monthly Notices of the Royal Astronomical Society. 325 (3): 907–930. arXiv:astro-ph/0011340. Bibcode:2001MNRAS.325..907F. doi:10.1046/j.1365-8711.2001.04282.x. S2CID 119514186.
- Dessart, Luc (2015). "Numerical simulations of super-luminous supernovae of type IIn". MNRAS. 449 (4): 4304–4325. arXiv:1503.05463. Bibcode:2015MNRAS.449.4304D. doi:10.1093/mnras/stv609. S2CID 54221511.
External links
- Light curves and spectra on the Open Supernova Catalog
- Simbad
- http://www.astro.utoronto.ca/DDO/research/DDOSNe.html
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