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A Dense Companion to the Short-period Millisecond Pulsar Binary PSR J0636+5128
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). California Institute of Technology, USA.
Vise andre og tillknytning
Rekke forfattare: 52018 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 864, nr 1, artikkel-id 15Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

PSR J0636+5128 is a millisecond pulsar in one of the most compact pulsar binaries known, with a 96 minute orbital period. The pulsar mass function suggests a very low mass companion, similar to that seen in so-called black widow binaries. Unlike in most of those, however, no radio eclipses by material driven off from the companion were seen leading to the possibility that the companion was a degenerate remnant of a carbon-oxygen white dwarf. We report the discovery of the optical counterpart of its companion in images taken with the Gemini North and Keck I telescopes. The companion varies between r' = 25 and r' = 23 on the 96 minute orbital period of the binary, caused by irradiation from the pulsar's energetic wind. We modeled the multicolor light curve using parallax constraints from pulsar timing and determine a companion mass of (1.71 +/- 0.23) x 10(-2) M-circle dot,M- a radius of (7.6 +/- 1.4) x 10(-2) R-circle dot, and a mean density of 54 +/- 26 g cm(-3), all for an assumed neutron star mass of 1.4 M-circle dot. This makes the companion to PSR J0636+5128 one of the densest of the black widow systems. Modeling suggests that the composition is not predominantly hydrogen, perhaps due to an origin in an ultracompact X-ray binary.

sted, utgiver, år, opplag, sider
2018. Vol. 864, nr 1, artikkel-id 15
Emneord [en]
binaries: general, pulsars: individual (PSR J0636+5128)
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-160234DOI: 10.3847/1538-4357/aad54cISI: 000443007700004OAI: oai:DiVA.org:su-160234DiVA, id: diva2:1249859
Tilgjengelig fra: 2018-09-20 Laget: 2018-09-20 Sist oppdatert: 2018-09-20bibliografisk kontrollert

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