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Binary-Binary Interactions and the Formation of the PSR B1620-26 Triple System in M4

F. A. Rasio·S. McMillan·P. Hut
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Abstract

The hierarchical triple system containing the millisecond pulsar PSR B1620-26 in M4 is the first triple star system ever detected in a globular cluster. Such systems should form in globular clusters as a result of dynamical interactions between binaries. We propose that the triple system containing PSR B1620-26 formed through an exchange interaction between a wide primordial binary and a {\it pre-existing\/} binary millisecond pulsar. This scenario would have the advantage of reconciling the $\sim10^9\,$yr timing age of the pulsar with the much shorter lifetime of the triple system in the core of M4.

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F. A. Rasio, S. McMillan, P. Hut. 1994-09-22. Binary-Binary Interactions and the Formation of the PSR B1620-26 Triple System in M4. https://doi.org/10.1086/187708

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