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HS0705+6700 (also identified as V470 Cam) is a short period (2.3 h) postcommon envelope detached eclipsing sdB binary system which exhibits transittime variations (TTVs) of a cyclical nature. We report a further 25 timings oflight minima and show that our new TTVs support and extend this cyclicalpattern to 1.6 periods. We examine possible causes of the observed TTVs andconfirm that the presence of a third, and possibly a fourth, body could providean elegant explanation of these cyclical variations. However othernon-circumbinary mechanisms, e.g. Applegate magnetic dynamo effects, willremain possible contenders until sufficient data has been accumulated todemonstrate that the periodicity of the TTVs is time independent.

The eclipsing binary HS0705+6700 and the search for circumbinary objects