2024/04/10 by Chen, Zhangliang, Chen, Yizhi, Chen, Chen +2
#FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR)
paper · doi:10.48550/arxiv.2404.06845
Brown dwarfs (BDs) possessing masses within the range 40-60 M\rm Jup are rare around solar-type main-sequence (MS) stars, which gives rise to the brown dwarf desert (BDD). One caveat associated with previous studies of BDD is the relatively limited sample size of MS-BD binaries with accurately determined BD masses. We aim to produce a large sample of brown dwarf companions with precisely determined mass around main-sequence A-F-G type stars using observations of post common-envelope white dwarf (WD)-BD binaries. We employ the rapid binary evolution code COMPAS to deduce the properties of MS-BD binary progenitors from post common-envelope WD-BD binaries. This method supplements the directly observed MS-BD binary sample, enriching the data available for analyzing BDD around main-sequence A-F-G type stars. Our study opens a new window for studying the shape of BDD around A-F-G type main-sequence stars in the short period regime. We find tentative evidence that the `driest' part of BDD around A-F-G type stars may extend into an orbital period of several hundred days, albeit with a small sample size. More post common-envelope WD-BD binaries detected in the future will advance our understanding of the BDD around A-F-G type stars.