2008A&A...487...19N

Query : 2008A&A...487...19N

2008A&A...487...19N - Astronomy and Astrophysics, volume 48719-31 (2008/8-3)

The colour-lightcurve shape relation of type Ia supernovae and the reddening law.

NOBILI S. and GOOBAR A.

Abstract (from CDS):

We present a study of the time sequence of optical colours of a large sample of nearby type Ia supernovae (SNe Ia). We study the dependence of the colour time-evolution on the lightcurve shape, parametrized by the stretch factor. We determine the spectral template that minimizes the dispersion in the colours of SNe Ia, measured by UBVRI photometry of nearby supernovae. A clear colour dependence upon lightcurve shape is found, such that the narrower lightcurves are redder up to about one month past lightcurve maximum. After correcting for lightcurve-shape differences in intrinsic colour, we derive an average reddening law, that is well described by a Cardelli, Clayton & Mathis (1989ApJ...345..245C) law with RV=1.75±0.27 for 80 type Ia supernovae with E(B-V)≤0.7mag. A subset of 69 SNe that have modest reddening, E(B-V)<0.25 mag, gives a significantly smaller value, RV∼1, which suggests that the observed reddening of type Ia supernovae may have a more complex origin, perhaps associated with other processes besides extinction by interstellar dust inside the host galaxy.

Abstract Copyright: ∼

Journal keyword(s): stars: supernovae: general - ISM: dust, extinction - methods: statistical

Simbad objects: 71

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Number of rows : 71
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 1992au SN* 00 10 40.48 -49 56 45.3   18.17 18.11     SNIa 38 1
2 SN 1996bl SN* 00 36 17.97 +11 23 40.5   17.05 16.63     SNIa 69 1
3 SN 1999ef SN* 00 58 46.2 +12 44 45   15.72       SNIa 40 2
4 SN 1998ef SN* 01 03 26.87 +32 14 12.4   15.21       SNIa 75 1
5 SN 1999ej SN* 01 22 57.38 +33 27 58.0   15.65       SNIa 77 1
6 SN 1993ae SN* 01 29 48.91 -01 58 37.1   15.46 15.31     SNIa 62 1
7 SN 1999dk SN* 01 31 26.92 +14 17 05.7   15.06       SNIa 83 1
8 SN 1998es SN* 01 37 17.60 +05 52 50.6   13.99       SNIapec 128 1
9 SN 1996bo SN* 01 48 22.86 +11 31 15.1           SNIa 78 1
10 SN 1999dq SN* 02 33 59.68 +20 58 30.4   14.68       SNIapec 126 1
11 SN 1995ak SN* 02 45 48.83 +03 13 50.1   16.23 16.07     SNIa 69 1
12 SN 1992bc SN* 03 05 16.05 -39 33 34.6   15.15 15.17     SNIa 130 1
13 SN 1992bs SN* 03 29 27.20 -37 16 18.9     18.28     SNIa 58 1
14 SN 1992A SN* 03 36 27.41 -34 57 31.4   12.56 12.50     SNIa 409 1
15 SN 1992bp SN* 03 36 37.95 -18 21 13.7   18.53 18.37     SNIa 66 1
16 SN 1990Y SN* 03 37 22.630 -33 02 33.11           SNIa 51 1
17 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 281 1
18 SN 1992bh SN* 04 59 27.55 -58 49 44.2   17.68 17.55     SNIa 67 1
19 SN 1993ac SN* 05 46 23.58 +63 22 07.1   18.36 17.71     SNIa 63 1
20 SN 1997E SN* 06 47 38.10 +74 29 51.0   15.59       SNIa 64 1
21 SN 1997do SN* 07 26 42.50 +47 05 36.0   14.27       SNIa 74 1
22 SN 1992bg SN* 07 41 56.55 -62 31 10.0   17.39 16.66     SNIa 60 2
23 SN 1999aa SN* 08 27 42.03 +21 29 14.8           SNIap 274 1
24 SN 1996Z SN* 09 36 44.82 -21 08 51.7   14.63 14.2     SNIa 49 1
25 SN 1995D SN* 09 40 54.753 +05 08 26.16   13.42 13.22     SNIa 158 1
26 SN 1995al SN* 09 50 55.97 +33 33 09.4   13.36 13.22     SNIa 115 1
27 SN 1993ag SN* 10 03 35.00 -35 27 47.6   18.30 17.78     SNIa 71 1
28 SN 1992J SN* 10 09 00.30 -26 38 24.4   17.88 17.54     SNIa 50 1
29 SN 1991S SN* 10 29 27.7 +22 00 43   17.78 17.69     SNIa 62 1
30 SN 1993B SN* 10 34 51.38 -34 26 30.0   18.81 18.39     SNIa 57 1
31 SN 1998bu SN* 10 46 46.01 +11 50 07.5   12.11       SNIa 328 1
32 SN 1994ae SN* 10 47 01.94 +17 16 30.8   13.20 12.99     SNIa 183 1
33 SN 1989B SN* 11 20 13.93 +13 00 18.9   12.25       SNIa 372 1
34 SN 2001ba SN* 11 38 01.76 -32 19 51.0   16.44       SNIa 74 1
35 SN 2001V SN* 11 57 24.910 +25 12 09.51   14.62       SNIa 115 1
36 SN 1994M SN* 12 31 08.61 +00 36 19.6   16.31 16.24     SNIa 102 1
37 SN 1994S SN* 12 31 21.85 +29 08 04.0   14.80 14.77     SNIa 120 1
38 SN 1994D SN* 12 34 02.395 +07 42 05.70   11.75 12.03     SNIa 559 1
39 SN 1992P SN* 12 42 48.93 +10 21 36.2   16.14 16.09     SNIa 78 1
40 SN 1997Y SN* 12 45 31.40 +54 44 17.0   15.28       SNIa 61 1
41 SN 1998ab SN* 12 48 47.24 +41 55 28.3   15.94       SNIapec 76 1
42 SN 1996X SN* 13 18 01.13 -26 50 45.3   12.99 13.00     SNIa 198 1
43 SN 1994T SN* 13 21 30.73 -02 08 56.5   17.31 17.15     SNIa 57 1
44 SN 1991U SN* 13 23 22.00 -26 06 30.0   16.67 16.35     SNIa 56 1
45 SN 1992ag SN* 13 24 09.85 -23 52 43.7   16.64 16.15     SNIa 68 1
46 SN 1993O SN* 13 31 07.87 -33 12 50.5   17.79 17.96     SNIa 71 1
47 SN 2000ca SN* 13 35 22.98 -34 09 37.0   15.90       SNIa 57 2
48 SN 1996bk SN* 13 46 57.98 +60 58 12.9   14.89       SNIa 40 1
49 SN 1996C SN* 13 50 48.60 +49 19 07.1   16.53 16.48     SNIa 84 1
50 SN 1993H SN* 13 52 50.34 -30 42 23.3   16.99       SNIa 91 1
51 SN 2003du SN* 14 34 35.80 +59 20 03.8   13.46       SNIa 374 1
52 SN 1996ab SN* 15 21 08.35 +27 55 36.8   19.47 19.55     SNIa 37 1
53 SN 2005cf SN* 15 21 33.12 -07 26 57.1   13.54       SNIa 301 1
54 SN 1999cc SN* 16 02 42.03 +37 21 34.4   16.78       SNIa 83 1
55 SN 1999ac SN* 16 07 15.01 +07 58 20.4   14.34       SNIap 144 1
56 SN 1994Q SN* 16 49 51.13 +40 25 55.8   16.35 16.31     SNIa 68 1
57 SN 2002er SN* 17 11 29.88 +07 59 44.8   14.25       SNIa 144 1
58 SN 1990O SN* 17 15 35.92 +16 19 25.8   16.59 16.22     SNIa 83 1
59 SN 1998dx SN* 18 11 11.89 +49 51 40.7   17.71       SNIa 52 1
60 SN 1998V SN* 18 22 37.40 +15 42 08.4   15.07       SNIa 72 1
61 SN 2001cn SN* 18 46 17.84 -65 45 41.8   15.40       SNIa 41 1
62 SN 1990T SN* 19 59 02.29 -56 15 30.1   17.27 17.03     SNIa 55 1
63 SN 1991ag SN* 20 00 08.61 -55 22 03.1   14.67 14.39     SNIa 61 1
64 SN 1992al SN* 20 45 56.49 -51 23 39.9   14.59 14.54     SNIa 87 2
65 SN 1992ae SN* 21 28 17.94 -61 33 01.4   18.64 18.45     SNIa 68 2
66 SN 1998eg SN* 22 39 30.29 +08 36 20.6   16.11       SNIa 68 1
67 SN 1995ac SN* 22 45 34.14 -08 45 04.7   17.23 17.10     SNIapec 87 2
68 SN 1993L SN* 22 57 52.86 -35 51 26.8     13.20     SNIa 37 1
69 SN 1998dh SN* 23 14 40.31 +04 32 14.1   13.85       SNIa 92 1
70 SN 1992bl SN* 23 15 13.09 -44 44 35.7   17.34 17.33     SNIa 65 1
71 SN 1997dg SN* 23 40 14.21 +26 12 11.8   17.20       SNIa 50 2

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