論文・著書情報
| タイトル |
| 和文: | |
| 英文: | Early Phase Observations of Extremely Luminous Type Ia Supernova 2009dc |
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| 著者 |
| 和文: |
Yamanaka, M.,
Kawabata, K. S.,
Kinugasa, K.,
Tanaka, M.,
Imada, A.,
Maeda, K.,
Nomoto, K.,
Arai, A.,
Chiyonobu, S.,
Fukazawa, Y.,
Hashimoto, O.,
Honda, S.,
Ikejiri, Y.,
Itoh, R.,
Kamata, Y.,
河合 誠之,
Komatsu, T.,
Konishi, K.,
Kuroda, D.,
Miyamoto, H.,
Miyazaki, S.,
Nagae, O.,
Nakaya, H.,
Ohsugi, T.,
Omodaka, T.,
Sakai, N.,
Sasada, M.,
Suzuki, M.,
Taguchi, H.,
Takahashi, H.,
Tanaka, H.,
Uemura, M.,
Yamashita, T.,
Yanagisawa, K.,
Yoshida, M. ..
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| 英文: |
Yamanaka, M.,
Kawabata, K. S.,
Kinugasa, K.,
Tanaka, M.,
Imada, A.,
Maeda, K.,
Nomoto, K.,
Arai, A.,
Chiyonobu, S.,
Fukazawa, Y.,
Hashimoto, O.,
Honda, S.,
Ikejiri, Y.,
Itoh, R.,
Kamata, Y.,
Kawai, N.,
Komatsu, T.,
Konishi, K.,
Kuroda, D.,
Miyamoto, H.,
Miyazaki, S.,
Nagae, O.,
Nakaya, H.,
Ohsugi, T.,
Omodaka, T.,
Sakai, N.,
Sasada, M.,
Suzuki, M.,
Taguchi, H.,
Takahashi, H.,
Tanaka, H.,
Uemura, M.,
Yamashita, T.,
Yanagisawa, K.,
Yoshida, M. ..
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| 言語 |
English |
| 掲載誌/書名 |
| 和文: | |
| 英文: | The Astrophysical Journal |
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巻, 号, ページ
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Vol. 707
pp. L118-L122
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| 出版年月 |
2009年12月 |
| 出版者 |
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| 会議名称 |
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| 開催地 |
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| DOI |
https://doi.org/10.1088/0004-637X/707/2/L118 |
| アブストラクト |
We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of the light curve is Δm 15(B) = 0.65 ± 0.03, which is one of the slowest among SNe Ia. The peak V-band absolute magnitude is estimated to be MV = -19.90 ± 0.15 mag if no host extinction is assumed. It reaches MV = -20.19 ± 0.19 mag if we assume the host extinction of AV = 0.29 mag. SN 2009dc belongs to the most luminous class of SNe Ia, like SNe 2003fg and 2006gz. Our JHKs -band photometry shows that this SN is also one of the most luminous SNe Ia in near-infrared wavelengths. We estimate the ejected 56Ni mass of 1.2 ± 0.3 M sun for the no host extinction case (and of 1.6 ± 0.4 M sun for the host extinction of AV = 0.29 mag). The C II λ6580 absorption line remains visible until a week after the maximum brightness, in contrast to its early disappearance in SN 2006gz. The line velocity of Si II λ6355 is about 8000 km s-1 around the maximum, being considerably slower than that of SN 2006gz. The velocity of the C II line is similar to or slightly less than that of the Si II line around the maximum. The presence of the carbon line suggests that the thick unburned C+O layer remains after the explosion. Spectropolarimetric observations by Tanaka et al. indicate that the explosion is nearly spherical. These observational facts suggest that SN 2009dc is a super-Chandrasekhar mass SN Ia. |
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