Different twins in the millisecond pulsar recycling scenario

Optical polarimetry of PSR J1023+0038 and XSS J12270-4859

M. C. Baglio, P. D'Avanzo, S. Campana, F. Coti Zelati, S. Covino, Dave Russell

    Research output: Contribution to journalArticle

    Abstract

    We present the first optical polarimetric study of the two transitional pulsars PSR J1023+0038 and XSS J12270-4859. This work is focused on the search for intrinsically linearly polarised optical emission from the two systems. To this aim, we carried out multiband optical (BVRi) and near-infrared (NIR; JHK) photo-polarimetric observations of the two systems using the ESO New Technology Telescope (NTT) at La Silla (Chile), equipped with the EFOSC2 and the SOFI instruments. The system XSS J12270-4859 was observed during its radio-pulsar state; we did not detect a significant degree of polarisation in any of the bands, with 3σ upper limits, for example, of 1.4% in the R-band. We built the NIR-optical averaged spectral energy distribution (SED) of the system, which could be described well by an irradiated black body with radius R = 0.33 ± 0.03 R and albedo η = 0.32 ± 0.05, without the need for further components. Thus, we excluded the visible presence of an extended accretion disc and/or of relativistic jets. The case was different for PSR J1023+0038, which was in its accretion phase during our campaign. We measured a linear polarisation of 1.09 ± 0.27% and 0.90 ± 0.17% in the V and R bands, respectively. The phase-resolved polarimetric curve of the source in the R band reveals a hint of a sinusoidal modulation at the source 4.75 h orbital period, peaked at the same orbital phase as the light curve. The measured optical polarisation of PSR J1023+0038 could, in principle, be interpreted as electron scattering with free electrons, which can be found in the accretion disc of the system or even in the hot corona that sorrounds the disc itself, or as synchrotron emission from a jet of relativistic particles or an outflow. However, the NIR-optical SED of the system built from our dataset did not suggest the presence of a jet. We conclude that the optical linear polarisation observed for PSR J1023+0038 is possibly due to Thomson scattering with electrons in the disc, as is also suggested from the possible modulation of the R-band linear polarisation at the system orbital period.

    Original languageEnglish (US)
    Article numberA101
    JournalAstronomy and Astrophysics
    Volume591
    DOIs
    StatePublished - Jul 1 2016

    Fingerprint

    polarimetry
    recycling
    pulsars
    polarization
    linear polarization
    accretion
    spectral energy distribution
    accretion disks
    orbitals
    electron
    scattering
    modulation
    optical polarization
    Thomson scattering
    relativistic particles
    Chile
    extremely high frequencies
    European Southern Observatory
    albedo
    free electrons

    Keywords

    • Polarization
    • Stars: jets
    • Stars: neutron
    • X-rays: binaries

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Different twins in the millisecond pulsar recycling scenario : Optical polarimetry of PSR J1023+0038 and XSS J12270-4859. / Baglio, M. C.; D'Avanzo, P.; Campana, S.; Coti Zelati, F.; Covino, S.; Russell, Dave.

    In: Astronomy and Astrophysics, Vol. 591, A101, 01.07.2016.

    Research output: Contribution to journalArticle

    Baglio, M. C. ; D'Avanzo, P. ; Campana, S. ; Coti Zelati, F. ; Covino, S. ; Russell, Dave. / Different twins in the millisecond pulsar recycling scenario : Optical polarimetry of PSR J1023+0038 and XSS J12270-4859. In: Astronomy and Astrophysics. 2016 ; Vol. 591.
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    abstract = "We present the first optical polarimetric study of the two transitional pulsars PSR J1023+0038 and XSS J12270-4859. This work is focused on the search for intrinsically linearly polarised optical emission from the two systems. To this aim, we carried out multiband optical (BVRi) and near-infrared (NIR; JHK) photo-polarimetric observations of the two systems using the ESO New Technology Telescope (NTT) at La Silla (Chile), equipped with the EFOSC2 and the SOFI instruments. The system XSS J12270-4859 was observed during its radio-pulsar state; we did not detect a significant degree of polarisation in any of the bands, with 3σ upper limits, for example, of 1.4{\%} in the R-band. We built the NIR-optical averaged spectral energy distribution (SED) of the system, which could be described well by an irradiated black body with radius R∗ = 0.33 ± 0.03 R⊙ and albedo η = 0.32 ± 0.05, without the need for further components. Thus, we excluded the visible presence of an extended accretion disc and/or of relativistic jets. The case was different for PSR J1023+0038, which was in its accretion phase during our campaign. We measured a linear polarisation of 1.09 ± 0.27{\%} and 0.90 ± 0.17{\%} in the V and R bands, respectively. The phase-resolved polarimetric curve of the source in the R band reveals a hint of a sinusoidal modulation at the source 4.75 h orbital period, peaked at the same orbital phase as the light curve. The measured optical polarisation of PSR J1023+0038 could, in principle, be interpreted as electron scattering with free electrons, which can be found in the accretion disc of the system or even in the hot corona that sorrounds the disc itself, or as synchrotron emission from a jet of relativistic particles or an outflow. However, the NIR-optical SED of the system built from our dataset did not suggest the presence of a jet. We conclude that the optical linear polarisation observed for PSR J1023+0038 is possibly due to Thomson scattering with electrons in the disc, as is also suggested from the possible modulation of the R-band linear polarisation at the system orbital period.",
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    AU - Campana, S.

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    AU - Covino, S.

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