SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion

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dc.creatorMaeda, Keiichi
dc.creatorKawabata, Koji
dc.creatorTanaka, Masaomi
dc.creatorNomoto, Ken'ichi
dc.creatorTominaga, Nozomu
dc.creatorHattori, Takashi
dc.creatorMinezaki, Takeo
dc.creatorKuroda, Takami
dc.creatorSuzuki, Tomoharu
dc.creatorDeng, Jinsong
dc.creatorMazzali, Paolo A.
dc.creatorPian, Elena
dc.date2007-03-06
dc.date2007-03-08
dc.date.accessioned2026-07-07T12:31:18Z
dc.date.available2026-07-07T12:31:18Z
dc.descriptionOptical spectroscopy and photometry of SN 2006aj have been performed with the Subaru telescope at t > 200 days after GRB060218, the X-ray Flash with which it was associated. Strong nebular emission-lines with an expansion velocity of v ~ 7,300 km/s were detected. The peaked but relatively broad [OI]6300,6363 suggests the existence of ~ 2 Msun of materials in which ~1.3 Msun is oxygen. The core might be produced by a mildly asymmetric explosion. The spectra are unique among SNe Ic in (1) the absence of [CaII]7291,7324 emission, and (2) a strong emission feature at ~ 7400A, which requires ~ 0.05 Msun of newly-synthesized 58Ni. 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 Msun < Mms < 22 Msun and E ~ (1 - 3) 10^{51} erg, respectively.
dc.descriptionAccepted for Publication in the Astrophysical Journal Letters (2007, ApJ, 658, L5). 8 pages, including 1 table and 3 figures. Typos corrected
dc.identifierhttps://arxiv.org/abs/astro-ph/0703107
dc.identifierhttp://arxiv.org/abs/astro-ph/0703107
dc.identifierAstrophys.J.658:L5-L8,2007
dc.identifierdoi:10.1086/513564
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216400
dc.subjectAstrophysics
dc.titleSN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
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