تقرير
Pulse Timing Discovery of a Three-Day Companion to the Hot Subdwarf BPM 36430
| العنوان: | Pulse Timing Discovery of a Three-Day Companion to the Hot Subdwarf BPM 36430 |
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| المؤلفون: | Smith, Bryce A., Barlow, Brad N., Rosenthal, Benjamin, Hermes, J. J., Schaffenroth, Veronika |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | 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. Comment: 7 pages, 5 figures, 4 tables. Accepted for publication in the Astrophysical Journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ac9384 |
| URL الوصول: | http://arxiv.org/abs/2209.09909 |
| رقم الأكسشن: | edsarx.2209.09909 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ac9384 |
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