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- W4308117210 abstract "Hot subdwarf B stars are core-helium burning objects that have undergone envelope stripping, likely by a binary companion. Using high-speed photometry from the Transiting Exoplanet Survey Satellite, we have discovered the hot subdwarf BPM 36430 is a hybrid sdBV_rs pulsator exhibiting several low-amplitude g-modes and a strong p-mode pulsation. The latter shows a clear, periodic variation in its pulse arrival times. Fits to this phase oscillation imply BPM 36430 orbits a barycenter approximately 10 light-seconds away once every 3.1 d. Using the CHIRON echelle spectrograph on the CTIO 1.5-m telescope, we confirm the reflex motion by detecting a radial velocity variation with semi-amplitude, period, and phase in agreement with the pulse timings. We conclude that a white dwarf companion with minimum mass of 0.42 Msun orbits BPM 36430. Our study represents only the second time a companion orbiting a pulsating hot subdwarf or white dwarf has been detected from pulse timings and confirmed with radial velocities." @default.
- W4308117210 created "2022-11-08" @default.
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- W4308117210 date "2022-11-01" @default.
- W4308117210 modified "2023-10-18" @default.
- W4308117210 title "Pulse Timing Discovery of a Three-day Companion to the Hot Subdwarf BPM 36430" @default.
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- W4308117210 doi "https://doi.org/10.3847/1538-4357/ac9384" @default.
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