ZTF J0007+4804 is the first known hot subdwarf-white dwarf binary that exhibits SU UMa-type dwarf nova outbursts with a 108.72-minute orbital period.
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Direct O-C timing analysis yields an orbital decay rate of (-1.97 ± 0.05) × 10^{-12} s s^{-1} in ZTFJ2130, from which a chirp mass of 0.408 ± 0.006 solar masses is derived assuming pure GW emission.
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Discovery of the first outbursting hot subdwarf binary: ZTF J0007+4804
ZTF J0007+4804 is the first known hot subdwarf-white dwarf binary that exhibits SU UMa-type dwarf nova outbursts with a 108.72-minute orbital period.
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Observing Orbital Decay in the Ultracompact Hot Subdwarf Binary System ZTFJ213056.71+442046.5
Direct O-C timing analysis yields an orbital decay rate of (-1.97 ± 0.05) × 10^{-12} s s^{-1} in ZTFJ2130, from which a chirp mass of 0.408 ± 0.006 solar masses is derived assuming pure GW emission.