Light Curve of an Eclipsing Millisecond Pulsar Companion

Computer Science

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Hst Proposal Id #6836 Binaries And Star Formation

Scientific paper

PSR J2051--0827 is an exciting new millisecond pulsar which is in a 2.38 hour circular orbit about a 0.03 solar mass companion which eclipses the pulsed radiation from the pulsar for 20 minutes each orbit. The companion is only the second eclipsing millisecond pulsar companion identified optically. It provides an excellent opportunity to test the evolutionary scenarios implied for eclipsing and solitary millisecond pulsar systems. An accurate measurement of the magnitude and colour temperature of the companion as it passes through minimum light will allow us to distinguish whether the companion is tidally powered, or bloated due to impinging radiation, or has a radius which is consistent with a low mass white dwarf. The nature and radius of the companion are vital discriminants in determining the source of the eclipsing material and whether the companion will eventually be ablated. The companion may also be the coldest object known providing a unique opportunity to study the emergent spectrum with a combined HST optical and ground based infrared program.

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