TY - JOUR
T1 - The Common Envelope Evolution Outcome. II. Short-orbital-period Hot Subdwarf B Binaries Reveal a Clear Picture
AU - Ge, Hongwei
AU - Tout, Christopher A.
AU - Webbink, Ronald F.
AU - Chen, Xuefei
AU - Sarkar, Arnab
AU - Li, Jiao
AU - Li, Zhenwei
AU - Zhang, Lifu
AU - Han, Zhanwen
N1 - We wish to thank the referee for the valuable comments and suggestions, which have helped us further improve this work. This project is supported by the National Natural Science Foundation of China (NSFC; grant Nos. 12288102, 12125303, 12090040/3, and 12173081), the National Key R&D Program of China (2021YFA1600403 and 2021YFA1600401), the Yunnan Fundamental Research Projects (grant No. 202101AV070001), the Yunnan Revitalization Talent Support Program—Science & Technology Champion Project (No. 202305AB350003), the International Centre of Supernovae, Yunnan Key Laboratory (No. 202302AN360001), the Key Research Program of Frontier Sciences, CAS (No. ZDBS-LY-7005), and the Light of West China Program. C.A.T. thanks Churchill College for his fellowship. A.S. thanks the Gates Cambridge Trust for his scholarship.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - Common envelope evolution (CEE) is vital for forming short-orbital-period compact binaries. It covers many objects, such as double compact merging binaries, Type Ia supernovae progenitors, binary pulsars, and X-ray binaries. Knowledge of the common envelope (CE) ejection efficiency still needs to be improved, though progress has been made recently. Short-orbital-period hot subdwarf B star (sdB) plus white dwarf (WD) binaries are the most straightforward samples with which to constrain CEE physics. We apply the known orbital period-WD mass relation to constrain the sdB progenitors of seven sdB+WD binaries with a known inclination angle. The average CE efficiency parameter is 0.32. This is consistent with previous studies. However, the CE efficiency need not be constant, but a function of the initial mass ratio, based on well-constrained sdB progenitor mass and evolutionary stage. Our results can be used as physical inputs for binary population synthesis simulations of related objects. A similar method can also be applied to study other short-orbital-period WD binaries.
AB - Common envelope evolution (CEE) is vital for forming short-orbital-period compact binaries. It covers many objects, such as double compact merging binaries, Type Ia supernovae progenitors, binary pulsars, and X-ray binaries. Knowledge of the common envelope (CE) ejection efficiency still needs to be improved, though progress has been made recently. Short-orbital-period hot subdwarf B star (sdB) plus white dwarf (WD) binaries are the most straightforward samples with which to constrain CEE physics. We apply the known orbital period-WD mass relation to constrain the sdB progenitors of seven sdB+WD binaries with a known inclination angle. The average CE efficiency parameter is 0.32. This is consistent with previous studies. However, the CE efficiency need not be constant, but a function of the initial mass ratio, based on well-constrained sdB progenitor mass and evolutionary stage. Our results can be used as physical inputs for binary population synthesis simulations of related objects. A similar method can also be applied to study other short-orbital-period WD binaries.
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U2 - 10.3847/1538-4357/ad158e
DO - 10.3847/1538-4357/ad158e
M3 - Article
AN - SCOPUS:85183480508
SN - 0004-637X
VL - 961
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 202
ER -