SN 1998S

SN 1998S
	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]
Other designations	SN 1998S, 2MASS J11460613+4728553, AAVSO 1140+48
Event type	Supernova
Spectral class	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

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]

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.
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.
Dessart, Luc. "Numerical simulations of super-luminous supernovae of type IIn". MNRAS. 449: 4304–4325. arXiv:1503.05463. Bibcode:2015MNRAS.449.4304D. doi:10.1093/mnras/stv609.

External links

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[1] 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.

[2] 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.

[3] Dessart, Luc. "Numerical simulations of super-luminous supernovae of type IIn". MNRAS. 449: 4304–4325. arXiv:1503.05463. Bibcode:2015MNRAS.449.4304D. doi:10.1093/mnras/stv609.