收藏本站
收藏 | 投稿 | 手机打开
二维码
手机客户端打开本文

Nucleosynthesis in the accretion disks of Type Ⅱ collapsars

Indrani Banerjee  Banibrata Mukhopadhyay  
【摘要】:We investigate nucleosynthesis inside the gamma-ray burst(GRB) accretion disks formed by the Type II collapsars. In these collapsars, the core collapse of massive stars first leads to the formation of a proto-neutron star. After that, an outward moving shock triggers a successful supernova. However, the supernova ejecta lacks momentum and within a few seconds the newly formed neutron star gets transformed to a stellar mass black hole via massive fallback. The hydrodynamics of such an accretion disk formed from the fallback material of the supernova ejecta has been studied extensively in the past. We use these well-established hydrodynamic models for our accretion disk in order to understand nucleosynthesis, which is mainly advection dominated in the outer regions. Neutrino cooling becomes important in the inner disk where the temperature and density are higher. The higher the accretion rate(˙M) is, the higher the density and temperature are in the disks. We deal with accretion disks with relatively low accretion rates: 0.001 M ⊙ s 1~˙M ~0.01 M ⊙ s 1and hence these disks are predominantly advection dominated. We use He-rich and Sirich abundances as the initial condition of nucleosynthesis at the outer disk, and being equipped with the disk hydrodynamics and the nuclear network code, we study the abundance evolution as matter inflows and falls into the central object. We investigate the variation in the nucleosynthesis products in the disk with the change in the initial abundance at the outer disk and also with the change in the mass accretion rate. We report the synthesis of several unusual nuclei like31P,39K,43Sc,35Cl and various isotopes of titanium, vanadium, chromium, manganese and copper. We also confirm that isotopes of iron, cobalt, nickel, argon, calcium, sulphur and silicon get synthesized in the disk, as shown by previous authors. Much of these heavy elements thus synthesized are ejected from the disk via outflows and hence they should leave their signature in observed data.

知网文化
【相似文献】
中国期刊全文数据库 前20条
1 Philippe Prugniel;;Automatic determination of stellar atmospheric parameters and construction of stellar spectral templates of the Guoshoujing Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2011年08期
2 ;Exploration of SDSS stellar database by AutoClass[J];Science China(Physics,Mechanics & Astronomy);2011年09期
3 WANG FengFei;ZHANG HaoTong;LUO ALi;BAI ZhongRui;DU Bing;ZHAO YongHeng;;The effects of spectrograph slit modes on the accuracy of stellar radial velocity measurement and atmospheric parameter estimation[J];Science China(Physics,Mechanics & Astronomy);2013年10期
4 Chuan-Xing Liu;Pei-Ai Zhang;Yu Lu;;Estimating stellar atmospheric parameters based on Lasso features[J];Research in Astronomy and Astrophysics;2014年04期
5 ;Effects of α-Enhancement on Stellar Evolution[J];Chinese Journal of Astronomy and Astrophysics;2008年03期
6 刘晶晶;;The competition of neutrino energy loss due to the pair, photo-, plasma process at the late stages of stellar evolution[J];中国物理C;2009年01期
7 Kwing-Lam Chan;;Efficient turbulent compressible convection in the deep stellar atmosphere[J];Research in Astronomy and Astrophysics;2009年01期
8 ;Fitting formulae for the effects of binary interactions on lick indices and colors of stellar populations[J];Research in Astronomy and Astrophysics;2009年02期
9 Richard de Grijs;Soo-Chang Rey;Kyungsook Lee;Sangmo Tony Sohn;;Old stellar population synthesis:new age and mass estimates for Mayall II = G1[J];Research in Astronomy and Astrophysics;2009年06期
10 刘晶晶;;Plasma neutrino energy loss due to the axial-vector current at the late stages of stellar evolution[J];中国物理C;2009年10期
11 ;The Astrophysical S Factors of the ~(12)C(p,γ)~(13)N Reaction[J];Annual Report of China Institute of Atomic Energy;2009年00期
12 徐毅;徐望;马余刚;蔡翔舟;陈金根;范功涛;樊广伟;郭威;罗文;潘强岩;沈文庆;杨利峰;;Determination of the stellar reaction rate for ~(12)C(α, γ)~(16)O: using a new expression with the reaction mechanism[J];Chinese Physics B;2009年04期
13 Jarken Esimbek;;Characteristics of infrared point sources associated with OH masers[J];Research in Astronomy and Astrophysics;2010年02期
14 Jing-Jing Liu;;The neutrino energy loss by electron capture of nuclides ~(55)Co and ~(56)Ni in explosive stellar environments[J];Research in Astronomy and Astrophysics;2013年01期
15 Jiang-Hui Cai;Xu-Jun Zhao;Shi-Wei Sun;Ji-Fu Zhang;Hai-Feng Yang;;Stellar spectra association rule mining method based on the weighted frequent pattern tree[J];Research in Astronomy and Astrophysics;2013年03期
16 Keiko Moto'oka;Yoichi Itoh;;Measurements of the Ca II infrared triplet lines of young stellar objects[J];Research in Astronomy and Astrophysics;2013年10期
17 韩占文;Relations of core mass-stellar luminosity and core mass-stellar radius for AGB and FGB stars[J];Science in China,Ser.A;1998年08期
18 Sandeep Sahijpal;;Contributions of type II and Ib/c supernovae to Galactic chemical evolution[J];Research in Astronomy and Astrophysics;2014年06期
19 ;Infall and Outflow Activities in the Be star FY CMa[J];Chinese Journal of Astronomy and Astrophysics;2001年06期
20 Devarapalli Shanti Priya;Kandulapati Sriram;Pasagada Vivekananda Rao;;Photometric study of eclipsing binaries in the Large Magellanic Cloud--I.W UMa type binaries in the Large Magellanic Cloud[J];Research in Astronomy and Astrophysics;2011年02期
中国重要会议论文全文数据库 前10条
1 张余;;Testing three derivative methods of stellar population[A];中国天文学会2011年学术年会手册[C];2011年
2 张立云;;Chromospheric Activity of Late-type Stars of the Different Rotational Periods[A];中国天文学会2011年学术年会手册[C];2011年
3 江治波;;High resolution NIR polarimetric images of massive young stellar objects[A];中国天文学会2007年学术年会论文集[C];2007年
4 喻耐平;;The environment and star formation of the HII region Sh2-163:a multi-wavelength study[A];中国天文学会2011年学术年会手册[C];2011年
5 ;Influence of nuclear physics inputs on the Th/U chronometer[A];Book of Abstracts of the 13~(th) National Conference on Nuclear Structure and the 9~(th) Symposium on "Nuclear Structure and Quantum Mechanics"[C];2010年
6 LI Zhi-hong;SU Jun;GUO Bing;LI Zhi-chang;BAI Xi-xiang;LIU Jian-cheng;LI Yun-ju;YAN Sheng-quan;WANG Bao-xiang;WANG You-bao;LIAN Gang;ZENG Shen;LI Er-tao;FANG Xiao;LIU Wei-ping;CHEN Yong-shou;SHU Neng-chuan;FAN Qj-wen;;The Astrophysical S Factors of the ~(12)C(p,γ)~(13)N Reaction[A];Annual Report of China Institute of Atomic Energy 2009[C];2010年
7 郝伟;;The cumulative effect of distant stellar encounters on multi-planet systems in star clusters[A];中国天文学会2011年学术年会手册[C];2011年
8 ;Torque Reversals in Accreting Pulsars[A];中国天文学会高能分会2004年学术年会论文集[C];2004年
9 ;On the orbital evolution of multiple protoplanets embbeded in a proto-stellar disk[A];中国天文学会2007年学术年会论文集[C];2007年
10 颜景志;;Cyg X-1的光学分光观测(英文)[A];中国天文学会2007年学术年会论文集[C];2007年
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978