Anomalous extinction behaviour towards the type Ia SN 2003cg

被引：131

作者：

Elias-Rosa, N.

Benetti, S.

Cappellaro, E.

Turatto, M.

Mazzali, P. A.

Patat, F.

Meikle, W. P. S.

Stehle, M.

Pastorello, A.

Pignata, G.

Kotak, R.

Harutyunyan, A.

Altavilla, G.

Navasardyan, H.

Qiu, Y.

Salvo, M.

Hillebrandt, W.

机构：

[1] Astron Observ Padova, INAF, I-35122 Padua, Italy

[2] Univ La Laguna, E-38206 Tenerife, Spain

[3] Max Planck Inst Astrophys, D-85748 Garching, Germany

[4] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy

[5] European So Observ, D-85748 Garching, Germany

[6] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London SW7 2AZ, England

[7] Pontifica Univ Catolica, Dept Astron & Astrofis, Santiago, Chile

[8] Univ Barcelona, Dept Astron & Meteorol, E-08028 Barcelona, Spain

[9] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[10] Australian Natl Univ, Mt Stromlo Observ, Weston, ACT 2611, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2006年 / 369卷 / 04期

关键词：

supernovae : general; supernovae : individual : SN 2003cg; dust; extinction;

D O I：

10.1111/j.1365-2966.2006.10430.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present optical and near-infrared photometry and spectroscopy of the Type Ia SN 2003cg, which exploded in the nearby galaxy NGC 3169. The observations cover a period between -8.5 and +414 d post-maximum. SN 2003cg is a normal but highly reddened Type Ia event. Its B magnitude at maximum B-max = 15.94 +/- 0.04 and Delta m(15)(B)(obs) = 1.12 +/- 0.04 [Delta m(15)(B)(intrinsic) = 1.25 +/- 0.05]. Allowing R-V to become a free parameter within the Cardelli et al. extinction law, simultaneous matches to a range of colour curves of normal SNe Ia yielded E(B - V) = 1.33 +/- 0.11, and RV = 1.80 +/- 0.19. While the value obtained for R-V is small, such values have been invoked in the past, and may imply a grain size which is small compared with the average value for the local interstellar medium.

引用

页码：1880 / 1900

页数：21

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