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ISSN Approved Journal No: 2456-3315 | Impact factor: 8.14 | ESTD Year: 2016
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| Paper Title: | Galactic Motion, Variability, and the Brown Dwarf Mass Gap: Insights from Multiple Surveys |
| Authors Name: | Nenavath Abhay Vivek Siddhartha |
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IJRTI_206628
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| Published Paper Id: | IJRTI2510054 |
| Published In: | Volume 10 Issue 10, October-2025 |
| DOI: | |
| Abstract: | This paper presents an analysis of 2,345 spectroscopically confirmed L and T type brown dwarfs, where I’ve combined photometric measurements from SDSS DR16, 2MASS, WISE surveys along with astrometric data from Gaia EDR3. The main goal was to investigate two aspects that have puzzled me for a while: whether atmospheric variability in brown dwarfs correlates with their galactic kinematics, and what the actual mass distribution tells us about formation. My theoretical calculations suggest that metallicity differences due to galactic chemical evolution should create observable variations in near-infrared variability amplitudes when plotted against tangential velocity. Specifically, I predict brown dwarfs with vtan > 80 km s−1 will show variability amplitudes that are smaller by a factor of 2.3 ± 0.4 compared to typical thin disk objects. This happens because sub-solar metallicities lead to reduced cloud opacity. Current JWST monitoring programs should be able to test this. The mass function analysis revealed something unexpected - there’s a significant deficit (4.7σ confidence) of objects between 0.030-0.075 M⊙ compared to what we’d expect from extrapolating the stellar regime. The distribution follows different power laws: ξ(M) ∝ M−0.3±0.2 for masses above 0.075 M⊙ and ξ(M) ∝ M−1.4±0.3 below 0.030 M⊙. This bimodal pattern points toward two formation channels - turbulent fragmentation for the heavier objects and disk instability with ejection for the lighter ones. |
| Keywords: | Keywords: brown dwarfs — stars: low-mass — stars: atmospheres — stars: kinematics and dynamics — stars: luminosity function, mass function — infrared: stars |
| Cite Article: | "Galactic Motion, Variability, and the Brown Dwarf Mass Gap: Insights from Multiple Surveys", International Journal of Science & Engineering Development Research (www.ijrti.org), ISSN:2455-2631, Vol.10, Issue 10, page no.a552-a557, October-2025, Available :http://www.ijrti.org/papers/IJRTI2510054.pdf |
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2456-3315 | IMPACT FACTOR: 8.14 Calculated By Google Scholar| ESTD YEAR: 2016 An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 8.14 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator |
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Published Paper ID: IJRTI2510054
Registration ID:206628
Published In: Volume 10 Issue 10, October-2025
DOI (Digital Object Identifier):
Page No: a552-a557 Country: nizamabad , telengana, India Research Area: Physics Publisher : IJ Publication Published Paper URL : https://www.ijrti.org/viewpaperforall?paper=IJRTI2510054 Published Paper PDF: https://www.ijrti.org/papers/IJRTI2510054 |
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ISSN: 2456-3315
Impact Factor: 8.14 and ISSN APPROVED,
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