SN 2003gd

Supernova
name = SN 2003gd


caption = Image of SN 2003gd at 6 months after the explosion, taken with the Isaac Newton Telescope
epoch = J2000.0
type = SN II-P
SNRtype =
host = Messier 74 (NGC 628)
constellation = Pisces
ra =01^h 36^m 42.65^s
dec =+15° 44' 20.9"
gal = 138.6379 -45.7477
discovery = 12 June 2003
iauc = [http://www.cfa.harvard.edu/iauc/08100/08150.html]
mag_v = 13.2
distance = 30 ± 6 Mly
progenitor = ?
progenitor_type = Red supergiant
b-v = Unknown
notes = N/A

SN 2003gd was a type II-P supernova occurring in the spiral galaxy Messier 74 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. [ [http://www.cfa.harvard.edu/iauc/08100/08150.html IAU Circular No. 8150] , accessed April 10, 2008]

Progenitor

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, 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. [cite web
url = http://www.ing.iac.es/PR/SH/SH2004/sn.html | title = First Detection of a Progenitor Star from a Normal Type II-P Supernova | access-date = 2008-04-10] [cite article | author = S.J. Smartt et al | title = Detection of a Red Supergiant Progenitor Star of a Type II-Plateau Supernova | journal = Science | year = 2004 | issue = 5657 | pages = 499-503 | url = http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004Sci...303..499S&db_key=AST&high=41d9aae83d25700]

References

External links

* [http://gallery.spitzer.caltech.edu/Imagegallery/image.php?
]
* [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=SN+2003gd&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Entry for SN 2003gd in the SIMBAD database]