====== Analyzing Brown Dwarf Models with MESA Data in Python ====== === InvestigateMESABrownDwarfModel.ipynb === This file appears to be a Jupyter notebook (.ipynb) focused on analyzing brown dwarf models using data processed through the Modules for Experiments in Stellar Astrophysics (MESA). It includes Python code to import necessary libraries (matplotlib for plotting, numpy for numerical calculations, mesa_reader for reading MESA data, pandas for data manipulation), define a function to parse MESA model files, load and process data from a specific model file, and plot the results to visualize the properties (like radius and density) of brown dwarfs. The notebook likely serves as an educational or research tool to investigate the physical characteristics of brown dwarfs using computational astrophysics methods. ```python import matplotlib.pyplot as plt import numpy as np import mesa_reader as mr import pandas as pd from io import StringIO import re plt.style.use(pubStyle) ``` ```python def parse_mesa_MOD_file(filepath): with open(filepath, 'r') as f: content = f.read() metadataSection = '\n'.join(content.split('\n')[:23]) metadata = re.finditer(r"(([A-Za-z_\/]+)\s+(.+)\n)[^\n]", metadataSection) dataSection = '\n'.join(content.split('\n')[23:-9]) dataSection = dataSection.replace("D", "E") df = pd.read_fwf(StringIO(dataSection), colspecs='infer') return df ``` ```python df = parse_mesa_MOD_file("../../BrownDwarfMESA/BD_TEST.mod") print(df) ``` Unnamed: 0 lnd lnT lnR L dq \ 0 1 -12.054305 6.527047 22.453983 4.802104e+27 5.000000e-13 1 2 -11.980301 6.538191 22.453980 4.802104e+27 2.500000e-13 2 3 -11.934523 6.545397 22.453979 4.802104e+27 2.500000e-13 3 4 -11.899147 6.551094 22.453977 4.802104e+27 1.562500e-13 4 5 -11.872967 6.555398 22.453976 4.802104e+27 1.562500e-13 .. ... ... ... ... ... ... 784 85 6.282040 13.137382 17.382338 1.268326e+22 6.250582e-07 785 86 6.282077 13.137392 17.151280 6.341716e+21 3.125291e-07 786 87 6.282099 13.137398 16.920226 3.170886e+21 1.562646e-07 787 88 6.282114 13.137402 16.689173 1.585451e+21 7.813228e-08 788 89 6.282126 13.137405 16.458122 7.927282e+20 7.813228e-08 mlt_vc h1 he3 he4 c12 n14 o16 ne20 \ 0 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 1 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 2 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 3 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 4 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 .. ... ... ... ... ... ... ... ... 784 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 785 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 786 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 787 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 788 0.0 0.7 0.00003 0.27997 0.003447 0.00101 0.009381 0.002085 mg24 0 0.004077 1 0.004077 2 0.004077 3 0.004077 4 0.004077 .. ... 784 0.004077 785 0.004077 786 0.004077 787 0.004077 788 0.004077 [789 rows x 15 columns] ```python fig, ax = plt.subplots(1, 1, figsize=(10, 7)) ax.plot(np.exp(df.lnR.values), np.exp(df.lnd.values)) ``` [] ![png](media:4d33eb853cbc53f73a5c42363d4996e1ec5f987176a3564e984c31383a982e29:output_3_1.png) ```python df.lnd.values ``` array([-1.20543046e+01, -1.19803014e+01, -1.19345230e+01, -1.18991469e+01, -1.18729673e+01, -1.18352586e+01, -1.17875802e+01, -1.17425961e+01, -1.17104371e+01, -1.16795644e+01, -1.16498235e+01, -1.16211936e+01, -1.15845539e+01, -1.15495476e+01, -1.15160410e+01, -1.14839175e+01, -1.14530720e+01, -1.14234095e+01, -1.13948454e+01, -1.13673042e+01, -1.13407178e+01, -1.13150242e+01, -1.12901676e+01, -1.12543714e+01, 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5.97542004e+00, 5.98626952e+00, 5.99712202e+00, 6.00797748e+00, 6.01883589e+00, 6.02969718e+00, 6.04056133e+00, 6.04875266e+00, 6.05418720e+00, 6.06229645e+00, 6.07316893e+00, 6.08404411e+00, 6.09492193e+00, 6.10580234e+00, 6.11668529e+00, 6.12757070e+00, 6.13845850e+00, 6.14934859e+00, 6.16024086e+00, 6.17113515e+00, 6.18203126e+00, 6.19292888e+00, 6.20382757e+00, 6.21472661e+00, 6.23031266e+00, 6.24768301e+00, 6.25624005e+00, 6.26279731e+00, 6.26980947e+00, 6.27426257e+00, 6.27692630e+00, 6.27880361e+00, 6.27996892e+00, 6.28068411e+00, 6.28111445e+00, 6.28136574e+00, 6.28155411e+00, 6.28174442e+00, 6.28189030e+00, 6.28198218e+00, 6.28204006e+00, 6.28207652e+00, 6.28209949e+00, 6.28211396e+00, 6.28212611e+00]) ```python ```