TY - JOUR
T1 - A study of the Type II-P supernova 2003gd in M74
AU - Hendry, M.A.
AU - Smartt, Stephen
AU - Maund, J.R.
AU - Pastorello, A.
AU - Zampieri, L.
AU - Benetti, S.
AU - Turatto, M.
AU - Capellaro, E.
AU - Meikle, W.P.S.
AU - Kotak, R.
AU - Irwin, M.
AU - Jonker, P.
AU - Vermaas, L.
AU - Peletier, R.
AU - Van Woerden, H.
AU - Exter, K.
AU - Pollacco, D.
AU - Leon, L.
AU - Verley, S.
AU - Benn, C.R.
AU - Pignata, G.
PY - 2005/5/21
Y1 - 2005/5/21
N2 - We present photometric and spectroscopic data of the Type II-P supernova (SN II-P) 2003gd, which was discovered in M74 close to the end of its plateau phase. SN 2003gd is the first Type II supernova ( SN) to have a directly confirmed red supergiant ( RSG) progenitor. We compare SN 2003gd to SN 1999 em, a similar SN II-P, and estimate an explosion date of 2003 March 18. We determine a reddening towards the SN of E(B-V) = 0.14 +/- 0.06, using three different methods. We also calculate three new distances to M74 of 9.6 +/- 2.8, 7.7 +/- 1.7 and 9.6 +/- 2.2 Mpc. The former was estimated using the standard candle method (SCM), for Type II supernovae (SNe II), and the latter two using the brightest supergiants method (BSM). When combined with existing kinematic and BSM distance estimates, we derive a mean value of 9.3 +/- 1.8 Mpc. SN 2003gd was found to have a lower tail luminosity compared with other normal Type II-P supernovae ( SNe II-P) bringing into question the nature of this SN. We present a discussion concluding that this is a normal SN II-P, which is consistent with the observed progenitor mass of 8(-2)(+4) M-circle dot.
AB - We present photometric and spectroscopic data of the Type II-P supernova (SN II-P) 2003gd, which was discovered in M74 close to the end of its plateau phase. SN 2003gd is the first Type II supernova ( SN) to have a directly confirmed red supergiant ( RSG) progenitor. We compare SN 2003gd to SN 1999 em, a similar SN II-P, and estimate an explosion date of 2003 March 18. We determine a reddening towards the SN of E(B-V) = 0.14 +/- 0.06, using three different methods. We also calculate three new distances to M74 of 9.6 +/- 2.8, 7.7 +/- 1.7 and 9.6 +/- 2.2 Mpc. The former was estimated using the standard candle method (SCM), for Type II supernovae (SNe II), and the latter two using the brightest supergiants method (BSM). When combined with existing kinematic and BSM distance estimates, we derive a mean value of 9.3 +/- 1.8 Mpc. SN 2003gd was found to have a lower tail luminosity compared with other normal Type II-P supernovae ( SNe II-P) bringing into question the nature of this SN. We present a discussion concluding that this is a normal SN II-P, which is consistent with the observed progenitor mass of 8(-2)(+4) M-circle dot.
UR - http://www.scopus.com/inward/record.url?scp=19844364476&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2005.08928.x
DO - 10.1111/j.1365-2966.2005.08928.x
M3 - Article
SN - 0035-8711
VL - 359
SP - 906
EP - 926
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -