论文标题
脉搏定时发现了热门subdwarf BPM 36430的三天伴侣
Pulse Timing Discovery of a Three-Day Companion to the Hot Subdwarf BPM 36430
论文作者
论文摘要
热的Subdwarf B恒星是核心燃烧物体，可能由二进制伴侣经过信封剥离。使用来自过渡系外行星调查卫星的高速光度法，我们发现热subdwarf bpm 36430是一种杂交SDBV_RS脉动器，表现出几种低振幅G模型和强p模式脉冲。后者在其脉冲到达时间中显示出明显的周期性变化。适合此相位振荡，暗示BPM 36430轨道每3.1 d左右一次左右一次。使用CTIO 1.5-m望远镜上的Chiron Echelle光谱仪，我们通过检测具有半振幅，周期和相位与脉冲时间一致的径向速度变化来确认反射运动。我们得出的结论是，最小质量为0.42 MSUN ORBITS BPM 36430的白色矮人伴侣。我们的研究仅代表第二次从脉冲时机中检测到旋转脉动热的细分或白矮星的伴侣，并用径向速度证实。
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.
