TY  - JOUR
A1  - Smith, Bryce A.
A1  - Barlow, Brad N.
A1  - Rosenthal, Benjamin
A1  - Hermes, J. J.
A1  - Schaffenroth, Veronika
T1  - Pulse Timing Discovery of a Three-day Companion to the Hot Subdwarf BPM 36430
T2  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - 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 days. Using the CHIRON echelle spectrograph on the CTIO 1.5 m telescope, we confirm the reflex motion by detecting a radial-velocity variation with semiamplitude, period, and phase in agreement with the pulse timings. We conclude that a white dwarf companion with minimum mass of approximate to 0.42 M (circle dot) 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.
Y1  - 2022
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/60948
SN  - 0004-637X
SN  - 1538-4357
VL  - 939
IS  - 1
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -