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Signature of the presence of a third body orbiting around XB 1916-053

Sanna, A.; Romano, P.; Di Salvo, T. +9 more

Context. The ultra-compact dipping source XB 1916-053 has an orbital period of close to 50 min and a companion star with a very low mass (less than 0.1 M_⊙). The orbital period derivative of the source was estimated to be 1.5(3) × 10^-11 s/s through analysing the delays associated with the dip arrival times o…