2026-04-17T18:37:32Zivo://CDS.VizieR/J/A+A/707/A3122026-03-19T00:38:57ZJ.A_AIVOAThe fate of MS-BD binariesUnderstanding the survival and orbital evolution of brown dwarf (BD) companions during the post-main-sequence (MS) evolution of their host stars is increasingly important, especially with recent discoveries of many substellar companions around white dwarfs (WDs). We investigate the long-term evolution and final outcomes of BDs orbiting low-mass MS stars as these evolve into WDs. By comparing forward-modeling populations with observed WD-BD binaries, we test evolutionary models and predict the existence of yet-undetected systems. We employ the COMPAS binary population synthesis code to evolve observed MS-BD systems through the post-MS phases of their host stars into the WD stage, tracking orbital changes driven by mass loss, tides, and common-envelope (CE) evolution. Our simulations reproduce a period gap in the distribution of detached WD-BD binaries, consistent with observations. We also identify a boundary separating detached and semi-detached systems on the period-mass diagram, located at orbital periods of ~1-2 hours depending on the BD mass. We predict that a subset of currently known MS-BD binaries will survive post-MS evolution and emerge as detached WD-BD systems, while others will undergo CE evolution and potentially form cataclysmic variables with BD donors. Our results reproduce the observed period gap in WD-BD binaries and provide quantitative predictions for the role of CE efficiency in shaping their distribution. This work predicts that many WD-BD systems remain undetected, motivating targeted searches with microlensing and high-contrast imaging techniques using next-generation large telescopes.eclipsing-binary-starsbrown-dwarfsstandard-starsstellar-massesorbitsmetallicityastronomical-reference-materialsinterdisciplinary-astronomyastrophysical-processesstellar-astronomyobservational-astronomyhttps://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/707/A312https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A3122026A&A...707A.312Chttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A312Cone search capability for table J/A+A/707/A312/msbd (Main-sequence-Brown dwarf catalog)Chen Z.Jin H.Ge H.Yu C.Wang K.Chen D.Ma B.CDS2026https://cds.unistra.fr/vizier-org/licences_vizier.htmlCDS support team <cds-question@unistra.fr>DatasetAstroObjectsastronomy