On the Progenitors of AM CVn Stars as LISA Sources: The Evolved Donor Star Channel

Abstract The space gravitational wave (GW) detector Laser Interferometer Space Antenna (LISA) that is planned to be launched in the early 2030s will detect low-frequency GW signals Galaxy. AM CVn stars were generally thought important sources. Employing MESA code, this work we calculate evolution of a great number binary systems consisting white dwarf (WD) and main sequence (MS) star, diagnose whether their descendant-AM visible with LISA. simulated results show progenitors these LISA sources, within distance 1 kpc, are WD–MS binaries donor star 1.0–1.4 M ? (for initial WD mass 0.5 ) or 1.0–2.0 0.7 ), an orbital period slightly smaller than bifurcation period. Our simulations also indicate 10 verification sources can reproduced by standard magnetic braking model, potential Based on birth rate population synthesis, CVn-LISA evolving from evolved channel kpc estimated (0.6–1.4) × ?6 yr ?1 , predicted about 340–810. Therefore, plays role forming