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Kinematic Constraints On Brown Dwarf Atmospheric Variability And Evidence For Bimodal Formation From Multi-Survey Analysis

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  • N. Abhay Vivek Siddhartha

    (Bansal Junior College Nizamabad)

Abstract

We present a comprehensive analysis of 2,345 spectroscopically confirmed L and T dwarfs combining photometric data from SDSS DR16, 2MASS, WISE, and astrometric measurements from Gaia EDR3. Our investigation addresses two fundamental questions regarding brown dwarf populations: the relationship between atmospheric variability and galactic kinematics, and the underlying mass distribution revealing formation mechanisms. Through Monte Carlo simulations incorporating the BT-Settl atmospheric models, we demonstrate that metallicity variations arising from galactic chemical evolution should produce measurable dif- ferences in near-infrared variability amplitudes as a function of tangential velocity. We predict that brown dwarfs with vtan > 80 km s−1 will exhibit variability amplitudes reduced by a factor of 2.3 ± 0.4 compared to thin disk members, driven by decreased cloud opacity at sub-solar metallicities. This prediction is testable with current JWST monitoring programs. Analysis of the mass function reveals a statistically significant (4.7σ) deficit of objects in the 0.030 −0.075 M⊙ range relative to log-normal extrapolation from the stellar regime. The distribution exhibits a broken power law with ξ(M ) ∠M −0.3±0.2 for M > 0.075 M⊙ and ξ(M ) ∠M −1.4±0.3 for M

Suggested Citation

  • N. Abhay Vivek Siddhartha, 2025. "Kinematic Constraints On Brown Dwarf Atmospheric Variability And Evidence For Bimodal Formation From Multi-Survey Analysis," International Journal of Research and Scientific Innovation, International Journal of Research and Scientific Innovation (IJRSI), vol. 12(13), pages 3096-3104, August.
    • Handle: RePEc:bjc:journl:v:12:y:2025:i:13:p:3096-3104
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