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Keck and European southern observatory very large telescope view of the symmetry of the ejecta of the XRF/SN 2006aj
Mazzali, Paolo A.; Foley, Ryan J.; Deng, Jinsong; Patat, Ferdinando; Pian, Elena; Baade, Dietrich; Bloom, Joshua S.; Filippenko, Alexei V.; Perley, Daniel A.; Valenti, Stefano; Wang, Lifan; Kawabata, Koji; Maeda, Keiichi; Nomoto, Ken-Ichi
2007-06-01
发表期刊ASTROPHYSICAL JOURNAL
卷号661期号:2页码:892-898
摘要Nebular-phase spectra of SN 2006aj, discovered in coincidence with XRF 060218, were obtained with Keck in 2006 July and VLT in 2006 September. At the latter epoch spectropolarimetry was also attempted, yielding a polarization upper limit of similar to 2%. The spectra show strong [O I] and Mg I] emission lines, as expected in Type Ic supernovae, but weak Ca ii lines. The [ Fe ii] lines that were strong in SN 1998bw are much weaker in SN 2006aj, consistent with its lower luminosity. The outer velocity of the line-emitting region is similar to 8000 km s(-1) in July and similar to 7400 km s(-1) in September, consistent with the relatively low expansion kinetic energy of SN 2006aj. All lines have similar width, and their profiles indicate that no major asymmetries are present in the ejecta at velocities below v < 8000 km s(-1), except perhaps in the innermost part. The spectra were modeled with a non-LTE code. The mass of (56)Ni required to power the emission is similar to 0: 20 M(circle dot), confirming earlier results based on the light curve. The oxygen mass is similar to 1: 5 M(circle dot), again much less than in SN 1998bw, but similar to 0: 7 M(circle dot) larger than the value derived from the early-time modeling. The ejected mass below 8000 km s(-1) is similar to 2 M(circle dot), confirming that SN 2006aj was only about twice as massive and energetic as the normal Type Ic SN 1994I. The presence of a dense inner core, containing similar to 1 M(circle dot) of mostly oxygen and carbon, is inferred, as in all broad-lined SNe Ic. This core, which may be disklike, is too deep to influence the early light curve and too small to affect the late polarization spectrum.
关键词Gamma Rays : Bursts Supernovae : General Nuclear Reactions Supernovae : Individual (Sn 2006aj) Nucleosynthesis Abundances
收录类别SCI
语种英语
WOS记录号WOS:000246947100022
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8317
专题星系宇宙学研究部
作者单位1.Max Planck Inst Astrophys, D-85748 Garching, Germany
2.Natl Inst Astrophys, OATs, I-34143 Trieste, Italy
3.Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
4.Univ Tokyo, Sch Sci, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan
5.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
7.European So Observ, D-85748 Garching, Germany
8.Univ Ferrara, Dept Phys, I-44100 Ferrara, Italy
9.Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
10.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
11.Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan
12.Univ Tokyo, Grad Sch Arts & Sci, Dept Earth Sci & Astron, Meguro Ku, Tokyo 1538892, Japan
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Mazzali, Paolo A.,Foley, Ryan J.,Deng, Jinsong,et al. Keck and European southern observatory very large telescope view of the symmetry of the ejecta of the XRF/SN 2006aj[J]. ASTROPHYSICAL JOURNAL,2007,661(2):892-898.
APA Mazzali, Paolo A..,Foley, Ryan J..,Deng, Jinsong.,Patat, Ferdinando.,Pian, Elena.,...&Nomoto, Ken-Ichi.(2007).Keck and European southern observatory very large telescope view of the symmetry of the ejecta of the XRF/SN 2006aj.ASTROPHYSICAL JOURNAL,661(2),892-898.
MLA Mazzali, Paolo A.,et al."Keck and European southern observatory very large telescope view of the symmetry of the ejecta of the XRF/SN 2006aj".ASTROPHYSICAL JOURNAL 661.2(2007):892-898.
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