Pulse Timing Discovery of a Three-day Companion to the Hot Subdwarf BPM 36430
- 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.
Verfasserangaben: | Bryce A. SmithORCiD, Brad N. BarlowORCiD, Benjamin RosenthalORCiD, J. J. HermesORCiD, Veronika SchaffenrothORCiDGND |
---|---|
DOI: | https://doi.org/10.3847/1538-4357/ac9384 |
ISSN: | 0004-637X |
ISSN: | 1538-4357 |
Titel des übergeordneten Werks (Englisch): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
Verlag: | IOP Publ. Ltd. |
Verlagsort: | Bristol |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 02.11.2022 |
Erscheinungsjahr: | 2022 |
Datum der Freischaltung: | 22.01.2024 |
Band: | 939 |
Ausgabe: | 1 |
Aufsatznummer: | 57 |
Seitenanzahl: | 6 |
Fördernde Institution: | NASA [80NSSC21K0364]; TESS Guest Investigator Programs [80NSSC20K0592,; 80NSSC22K0737]; Deutsche Forschungsgemeinschaft [GE2506/9-1]; NASA's; Science Mission directorate |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer Review: | Referiert |
Publikationsweg: | Open Access / Hybrid Open-Access |
Lizenz (Deutsch): | CC-BY - Namensnennung 4.0 International |