{"paper":{"title":"Early phase observations of extremely luminous Type Ia Supernova 2009dc","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Arai, A. Imada, D. Kuroda, H. Miyamoto, H. Nakaya, H. Taguchi, H. Takahashi, H. Tanaka, K. Kinugasa, K. Maeda, K. Nomoto, K. S. Kawabata, K. Yanagisawa, M. Sasada, M. Suzuki, M. Tanaka, M. Uemura, M. Yamanaka, M. Yoshida, N. Kawai, N. Sakai, O. Hashimoto, O. Nagae, R. Itoh, S. Chiyonobu, S. Honda, S. Miyazaki, T. Komatsu, T. Ohsugi, T. Omodaka, T. Yamashita, Y. Fukazawa, Y. Ikejiri, Y. Kamata","submitted_at":"2009-08-14T15:55:20Z","abstract_excerpt":"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 $\\Delta m_{15}(B)=0.65\\pm 0.03$, which is one of the slowest among SNe Ia. The peak $V$-band absolute magnitude is $M_{V}=-19.90\\pm 0.15$ mag even if the host extinction is $A_{V}=0$ mag. It reaches $M_{V}=-20.19\\pm 0.19$ mag for the host extinction of $A_{V}=0.29$ mag as inferred from the observed Na {\\sc i} D line absorption in the host. Our $JHK_{s}$-band photometry shows that the SN is one of the most luminous SNe I"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.2059","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}