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- W3136384758 abstract "Thanks to the Gaia archived data, we find a correlation between the stellar types (with different average mass) and the scale parameters of the Maxwell-Boltzmann (MB) distribution of their dispersion velocities, by averaging over their age range. As expected, the late-type stars and brown dwarfs have wider velocity (MB) distributions with larger scale parameters than early-type ones. According to this correlation, we conclude that the dispersion velocities of brown dwarfs should have an MB profile with the scale parameter $asimeq 111.9~rm{km/s}$. This mass-velocity dispersion relation confirms the known age-velocity relation and additionally reveals the dependence of the stellar dispersion velocity to mass in the given average age. By considering this correlation as well as a brown dwarf population, we simulate microlensing events detectable by MOA-II toward the Galactic bulge fields gb5 and gb9 which were intensively observed during that observation. From this simulation, the average values of the events' duration are $18.72$ and $18.68~$days, which are close to the observational amounts, i.e., $17.4$ and $22.2~$days. In the simulation, we do not consider any extra free-floating exoplanet population. A population of speedy brown dwarfs with the corrected dispersion velocity profile generates the observational results of MOA-II and there is no need to include free-floating exoplanets." @default.
- W3136384758 created "2021-03-29" @default.
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- W3136384758 date "2021-03-19" @default.
- W3136384758 modified "2023-09-27" @default.
- W3136384758 title "Mass-velocity dispersion relation using Gaia data and its effect on interpreting short-duration microlensing events" @default.
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