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A 2 day orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397

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arxiv 2103.03989 v1 pith:INTGZZRM submitted 2021-03-06 astro-ph.HE

A 2 day orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397

Manuel Pichardo Marcano , L.E. Rivera Sandoval , Thomas J. Maccarone , Yue Zhao , Craig O. Heinke This is my paper
classification astro-ph.HE
keywords periodclusterglobularorbitalredbackcandidateopticalpulsar
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We report optical modulation of the companion to the X-ray source U18 in the globular cluster NGC 6397. U18, with combined evidence from radio and X-ray measurements, is a strong candidate as the second redback in this cluster, initially missed in pulsar searches. This object is a bright variable star with an anomalous red color and optical variability (\sim 0.2 mag in amplitude) with a periodicity \sim 1.96 days that can be interpreted as the orbital period. This value corresponds to the longest orbital period for known redback candidates and confirmed systems in Galactic globular clusters and one of the few with a period longer than 1 day.

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