Period and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP

Article, Preprint English OPEN
Lohr, ME ; Norton, AJ ; Anderson, DR ; Cameron, AC ; Faedi, F ; Haswell, CA ; Hellier, C ; Hodgkin, ST ; Horne, K ; Kolb, UC ; Maxted, PFL ; Pollacco, D ; Skillen, I ; Smalley, B ; West, RG ; Wheatley, PJ (2014)
  • Publisher: EDP Sciences
  • Related identifiers: doi: 10.1051/0004-6361/201424027
  • Subject: eclipsing [Binaries] | Astrophysics - Solar and Stellar Astrophysics | QB | binaries: eclipsing | stars: variables: general | binaries: close | QB Astronomy | close [Binaries] | variables: general [Stars]

The WASP project is currently funded and operated by Warwick University and Keele University, and was originally set up by Queen’s University Belfast, the Universities of Keele, St. Andrews and Leicester, the Open University, the Isaac Newton Group, the Instituto de Astrofisica de Canarias, the South African Astronomical Observatory and by STFC. This work was supported by the Science and Technology Funding Council and the Open University. Period or amplitude variations in eclipsing binaries may reveal the presence of additional massive bodies in the system, such as circumbinary planets. Here, we have studied twelve previously-known eclipsing post-common-envelope binaries for evidence of such light curve variations, on the basis of multi-year observations in the SuperWASP archive. The results for HW Vir provided strong evidence for period changes consistent with those measured by previous studies, and help support a two-planet model for the system. ASAS J102322-3737.0 exhibited plausible evidence for a period increase not previously suggested; while NY Vir, QS Vir and NSVS 14256825 afforded less significant support for period change, providing some confirmation to earlier claims. In other cases, period change was not convincingly observed; for AA Dor and NSVS 07826147, previous findings of constant period were confirmed. This study allows us to present hundreds of new primary eclipse timings for these systems, and further demonstrates the value of wide-field high-cadence surveys like SuperWASP for the investigation of variable stars. Publisher PDF Peer reviewed
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