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Alpha Centauri is, as you know, currently the closest star system to the Solar System. It is a triple star system, comprising Alpha Centauri A (a G2 V star slightly brighter and slightly more massive than the Sun), Alpha Centauri B (a K1 V slightly dimmer and slightly less massive than the Sun), and Alpha Centauri C (a low-mass, dim red dwarf which is also known as Proxima Centauri).
Proxima is strongly believed to be orbited by a world in the habitable zone. According to Wagner, K., Boehle, A., Pathak, P. et al in
To quote:
In other words, C1 is not a known systematic artifact, and is consistent with being either a Neptune-to-Saturn-sized planet or an exozodiacal dust disk.