Pa 13 contains a detached double-degenerate binary of two hot pre-white dwarfs with dynamical masses 0.41 and 0.39 solar masses, offering the strongest evidence yet for planetary nebulae around post-RGB stars via either double-core evolution or CE-induced rejuvenation.
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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.
citing papers explorer
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Two hot pre-white dwarfs inside the red-giant-branch planetary nebula Pa 13 -- Double core evolution or common envelope-induced rejuvenation?
Pa 13 contains a detached double-degenerate binary of two hot pre-white dwarfs with dynamical masses 0.41 and 0.39 solar masses, offering the strongest evidence yet for planetary nebulae around post-RGB stars via either double-core evolution or CE-induced rejuvenation.
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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.