Brown Dwarf Cooling Tracks: Luminosity and Effective Temperature from 0.1 to 10 Gigayears

This paper computes brown dwarf cooling, the steady fading of a substellar object that has no sustained fusion source to replace the heat it radiates. Because cooling is monotonic, a luminosity alone never gives a mass; it gives a curve in the mass-age plane. The headline computed values are: L_30Mjup_5Gyr = 1.92e-06; Teff_30Mjup_5Gyr = 717; L_75Mjup_5Gyr = 1.32e-05; Teff_75Mjup_5Gyr = 1160; fading_factor_30 = 133.0. All values were obtained from the stated scalings and normalisations in the deposited code; this study is simulated and computed, not measured, and no new observations are reported. Where the framework supplies no value for a quantity the question requires, that absence is reported plainly as a negative result.