Astronomy:SN 2003gd
 Spitzer Space Telescope image of a dust cloud at the position of the SN 2003gd explosion | |
| Event type | Supernova |
|---|---|
| Spectral class | Type II-P[1] |
| Date | 12 June 2003[1] |
| Constellation | Pisces |
| Right ascension | 01h 36m 42.65s[2] |
| Declination | +15° 44′ 20.9″[2] |
| Epoch | J2000.0 |
| Galactic coordinates | 138.6379° −45.7477°[1] |
| Distance | 30.3 ± 5.9 Mly (9.3 ± 1.8 Mpc)[3] |
| Host | Messier 74 (NGC 628)[1] |
| Progenitor type | Red supergiant[4] |
| Peak apparent magnitude | 13.2[1] |
SN 2003gd was a Type II-P supernova explosion in the spiral galaxy Messier 74, located in the constellation Pisces. SN 2003gd was discovered on 12 June 2003 by Robert Evans, using a 0.31m reflector, and its discovery was confirmed on 13 June 2003 by R. H. McNaught using the 1.0m telescope at the Siding Spring Observatory.[5]
This supernova was located along the outer edge of a spiral arm,[6] ~7.3 kpc from the galactic nucleus[3] at an angular offset 13.2″ east and 161.0″ south of the core.[1] It was discovered at the end of its "plateau phase", approximately 86 days after its estimated explosion date of 18 March 2003. Despite a lower tail luminosity in the light curve, this appears to be a normal Type II-p.[3] A light echo from nearby dust was detected in archival images from 2004.[7]
Messier 74 had been observed approximately 200 days before the explosion with the Hubble Space Telescope, and about 300 days before using the Gemini Telescope. Astronomers were able to identify an object in these pre-supernova images that was in the same position as SN 2003gd, and which is believed to be the supernova's progenitor star. This progenitor star was a red supergiant with a mass of ~8 M☉, consistent with the expectations of existing single-star stellar evolution models. It is the first progenitor of a normal type II-P supernova to have ever been detected.[8][9][4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Barbon, R. et al. (2008). Asiago Supernova Catalogue. Bibcode: 2008yCat....1.2024B.
- ↑ 2.0 2.1 McNaught, R. H. (June 2003). Green, D. W. E.. ed. "Supernova 2003gd in M74". IAU Circular 8152 (8152): 3. Bibcode: 2003IAUC.8152....3M.
- ↑ 3.0 3.1 3.2 Hendry, M. A. et al. (May 2005). "A study of the Type II-P supernova 2003gd in M74". Monthly Notices of the Royal Astronomical Society 359 (3): 906–926. doi:10.1111/j.1365-2966.2005.08928.x. Bibcode: 2005MNRAS.359..906H.
- ↑ 4.0 4.1 Maund, Justyn R.; Smartt, Stephen J. (April 2009). "The Disappearance of the Progenitors of Supernovae 1993J and 2003gd". Science 324 (5926): 486–488. doi:10.1126/science.1170198. PMID 19299586. Bibcode: 2009Sci...324..486M.
- ↑ Evans, R.; McNaught, R. H. (June 2003). Green, D. W. E.. ed. "Supernova 2003gd in M74". IAU Circular 8150 (8150): 2. Bibcode: 2003IAUC.8150....2E.
- ↑ Michałowski, Michał J. et al. (June 2020). "Connection of supernovae 2002ap, 2003gd, 2013ej, and 2019krl in M 74 with atomic gas accretion and spiral structure". Astronomy & Astrophysics 638: 7. doi:10.1051/0004-6361/202037692. A47. Bibcode: 2020A&A...638A..47M.
- ↑ Sugerman, Ben E. K. (October 2005). "Discovery of a Light Echo from SN 2003gd". The Astrophysical Journal 632 (1): L17–L20. doi:10.1086/497578. Bibcode: 2005ApJ...632L..17S.
- ↑ "First Detection of a Progenitor Star from a Normal Type II-P Supernova". http://www.ing.iac.es/PR/SH/SH2004/sn.html. Retrieved 2008-04-10.
- ↑ Smartt, Stephen J. et al. (2004). "Detection of a Red Supergiant Progenitor Star of a Type II-Plateau Supernova". Science 303 (5657): 499–503. doi:10.1126/science.1092967. PMID 14739452. Bibcode: 2004Sci...303..499S.
External links
- Light curves and spectra on the Open Supernova Catalog
- Image of SN 2003gd
- Entry for SN 2003gd in the SIMBAD database
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