Details

Autor(en) / Beteiligte

• Maeda, K
• Kawabata, K
• Tanaka, M
• Nomoto, K
• Tominaga, N
• Hattori, T
• Minezaki, T
• Kuroda, T
• Suzuki, T
• Deng, J
• Mazzali, P. A
• Pian, E

Titel

SN 2006aj Associated with XRF 060218 at Late Phases: Nucleosynthesis Signature of a Neutron Star-driven Explosion

Ist Teil von

• The Astrophysical journal, 2007-03, Vol.658 (1), p.L5-L8

Ort / Verlag

Chicago, IL: IOP Publishing

Erscheinungsjahr

2007

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Optical spectroscopy and photometry of SN 2006aj have been performed with the Subaru telescope at t > 200 days after GRB 060218, the X-ray flash with which it was associated. Strong nebular emission lines with an expansion velocity of u 6 7300 km s super(-1) were detected. The peaked but relatively broad [O I] l l6300,6363 suggests the existence of 62 M of materials in which 61.3 M is oxygen. The core might be produced by a mildly asymmetric explosion. The spectra are unique among SNe Ic in (1) the absence of [Ca II] ll7291,7324 emission and (2) a strong emission feature at 67400 AA, which requires 60.05 M of newly synthesized super(58)Ni. Such a large amount of stable neutron-rich Ni strongly indicates the formation of a neutron star. The progenitor and the explosion energy are constrained to 18 M M sub(ms) 22 M and E6 (1-3) x 10 super(51) ergs, respectively.