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Pulsating in Unison at Optical and X-Ray Energies: Simultaneous High Time Resolution Observations of the Transitional Millisecond Pulsar PSR J1023+0038
INAF Osservatorio Astron Roma, Via Frascati 33, I-00076 Monte Porzio Catone, RM, Italy..
INAF IAPS, Via Fosso Cavaliere 100, I-00133 Rome, Italy..
INAF Osservatorio Astron Roma, Via Frascati 33, I-00076 Monte Porzio Catone, RM, Italy..
CSIC, ICE, Inst Space Sci, Campus UAB, E-08193 Barcelona, Spain.;IEEC, E-08034 Barcelona, Spain.;ICREA, E-08010 Barcelona, Spain..
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2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 882, no 2, article id 104Article in journal (Refereed) Published
Abstract [en]

PSR J1023+0038 is the first millisecond pulsar discovered to pulsate in the visible band; such a detection took place when the pulsar was surrounded by an accretion disk and also showed X-ray pulsations. We report on the first high time resolution observational campaign of this transitional pulsar in the disk state, using simultaneous observations in the optical (Telescopio Nazionale Galileo, Nordic Optical Telescope, Telescopi Joan Oro), X-ray (XMM-Newton, NuSTAR, NICER), infrared (Gran Telescopio Canarias), and UV (Swift) bands. Optical and X-ray pulsations were detected simultaneously in the X-ray high-intensity mode in which the source spends similar to 70% of the time, and both disappeared in the low mode, indicating a common underlying physical mechanism. In addition, optical and X-ray pulses were emitted within a few kilometers and had similar pulse shapes and distributions of the pulsed flux density compatible with a power-law relation F-nu proportional to nu(-0.7) connecting the optical and the 0.3-45 keV X-ray band. Optical pulses were also detected during flares with a pulsed flux reduced by one-third with respect to the high mode; the lack of a simultaneous detection of X-ray pulses is compatible with the lower photon statistics. We show that magnetically channeled accretion of plasma onto the surface of the neutron star cannot account for the optical pulsed luminosity (similar to 10(31) erg s(-1)). On the other hand, magnetospheric rotation-powered pulsar emission would require an extremely efficient conversion of spin-down power into pulsed optical and X-ray emission. We then propose that optical and X-ray pulses are instead produced by synchrotron emission from the intrabinary shock that forms where a striped pulsar wind meets the accretion disk, within a few light cylinder radii away, similar to 100 km, from the pulsar.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 882, no 2, article id 104
Keywords [en]
accretion, accretion disks, pulsars: individual (PSR J1023+0038), stars: neutron, X-rays: binaries
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-261315DOI: 10.3847/1538-4357/ab2fdfISI: 000485673200001OAI: oai:DiVA.org:kth-261315DiVA, id: diva2:1358308
Note

QC 20191007

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-07Bibliographically approved

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Veledina, Alexandra

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