wd_c_core_ignition

This test case the checks the onset of a thermonuclear runaway in an accreting Chandrasekhar mass carbon-oxygen white dwarf.

This test case has 2 parts. Click to see a larger version of a plot.

• Part 1 (inlist_relax_mass) loads make_co_wd_6M.mod, a 0.9577 Msun carbon-oxygen white dwarf model with a helium atmosphere, made from a 6 Msun ZAMS progenitor with make_co_wd. The outer helium layer is then removed to leave a 0.9497 Msun carbon-oxygen white dwarf and the run terminates:

• Part 2 (inlist_wd_c_core_ignition) continues the evolution by accreting a carbon-oxygen mixture with the same mass fractions as the surface at a rate of 1e-9 Msun/yr. As the white dwarf mass nears the Chandrasekhar mass, carbon burning causes the interior to become convective (the simmering phase of standard paradign Type Ia supernova). The run terminates when the power generated by nuclear reactions exceeds 1e8 Lsun:

Central density and temperature evolution:

Convective and burn history

pgstar commands used for the Part 1 plot above:

&pgstar
 file_white_on_black_flag = .true. ! white_on_black flags -- true means white foreground color on black background
 !file_device = 'png'            ! png
 !file_extension = 'png'

 file_device = 'vcps'          ! postscript
 file_extension = 'ps'

    Abundance_win_flag = .true.
    Abundance_win_width = 12
    Abundance_win_aspect_ratio = 1 ! aspect_ratio = height/width

    Abundance_xaxis_name = 'mass'
    Abundance_xmin = 0
    Abundance_xmin = -101d0

    Abundance_line_txt_scale_factor = 1.1 ! relative to other text
    Abundance_legend_txt_scale_factor = 1.1 ! relative to other text
    Abundance_legend_max_cnt = 0
    Abundance_log_mass_frac_min = -3 ! only used if < 0

    Abundance_file_flag = .true.
    Abundance_file_dir = 'pgstar_out'
    Abundance_file_prefix = 'abund_'
    Abundance_file_interval = 10000
    Abundance_file_width = -1
    Abundance_file_aspect_ratio = -1

/ ! end of pgstar namelist

pgstar commands used for the Part 2 plots above:

&pgstar

 file_white_on_black_flag = .true. ! white_on_black flags -- true means white foreground color on black background
 !file_device = 'png'            ! png
 !file_extension = 'png'

 file_device = 'vcps'          ! postscript
 file_extension = 'ps'

    TRho_win_flag = .true.
    TRho_win_width = 12
    TRho_win_aspect_ratio = 0.75 ! aspect_ratio = height/width
    TRho_title = 'wd_c_core_ignition'

    TRho_logT_min = 7.4
    TRho_logT_max = 8.7
    TRho_logRho_min = 7.0
    TRho_logRho_max = 10.5
    show_TRho_degeneracy_line = .true.

    TRho_file_flag = .true.
    TRho_file_dir = 'pgstar_out'
    TRho_file_prefix = 'trhoc_'
    TRho_file_interval = 10000
    TRho_file_width = -1
    TRho_file_aspect_ratio = -1


    History_Track1_win_flag = .true.
    History_Track1_win_width = 12
    History_Track1_win_aspect_ratio = 0.75
    History_Track1_title = 'wd_c_core_ignition'

    History_Track1_xname = 'log_center_T'
    History_Track1_yname = 'log_Lnuc'
    History_Track1_xaxis_label = 'log T\dcenter'
    History_Track1_yaxis_label = 'log Lnuc/L\d\(2281)'
    History_Track1_reverse_xaxis = .false.
    History_Track1_reverse_yaxis = .false.

    History_Track1_xmin = 7.7
    History_Track1_xmax = 8.7
    History_Track1_ymin = -5.0
    History_Track1_ymax = 9.0

    History_Track1_file_flag = .true.
    History_Track1_file_dir = 'pgstar_out'
    History_Track1_file_prefix = 'track1_'
    History_Track1_file_interval = 10000
    History_Track1_file_width = -1
    History_Track1_file_aspect_ratio = -1

    Kipp_win_flag = .true.
    Kipp_win_width = 12
    Kipp_title = 'wd_c_core_ignition'
    Kipp_mass_max = -101d0
    Kipp_show_mixing = .true.
    Kipp_show_burn = .true.
    Kipp_show_luminosities = .true.
    Kipp_lgL_max = 3.0
    Kipp_file_flag = .true.
    Kipp_file_dir = 'pgstar_out'
    Kipp_file_prefix = 'kipp_'
    Kipp_file_interval = 10000
    Kipp_file_width = -1
    Kipp_file_aspect_ratio = -1

/ ! end of pgstar namelist

Last-Updated: 04Jul2021 (MESA 094ff71) by fxt.