Broad-band characteristics of seven new hard X-ray selected cataclysmic variables

F. Bernardini, D. de Martino, K. Mukai, Dave Russell, M. Falanga, N. Masetti, C. Ferrigno, G. Israel

    Research output: Contribution to journalArticle

    Abstract

    We present timing and spectral analysis of a sample of seven hard X-ray selected cataclysmic variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton, complemented with Swift/BAT and INTEGRAL /IBIS hard X-ray data and ground-based optical photometry. For six sources, X-ray pulsations are detected for the first time in the range of ∼296-6098 s, identifying them as members of the magnetic class. Swift J0927.7-6945, Swift J0958.0-4208, Swift J1701.3-4304, Swift J2113.5+5422 and ossibly PBC J0801.2-4625 are intermediate polars (IPs), while Swift J0706.8+0325 is a short (1.7 h) orbital period polar, the 11th hard X-ray-selected identified so far. X-ray orbital modulation is also observed in Swift J0927.7-6945 (5.2 h) and Swift J2113.5+5422 (4.1 h). Swift J1701.3-4304 is discovered as the longest orbital period (12.8 h) deep eclipsing IP. The spectra of the magnetic systems reveal optically thin multitemperature emission between 0.2 and 60 keV. Energy-dependent spin pulses and the orbital modulation in Swift J0927.7-6945 and Swift J2113.5+5422 are due to intervening local high-density absorbing material (NH ∼ 1022 - 23 cm-2). In Swift J0958.0-4208 and Swift J1701.3-4304, a soft X-ray blackbody (kT ∼ 50 and ∼80 eV) is detected, adding them to the growing group of 'soft' IPs. White dwarf masses are determined in the range of ∼0.58-1.18M⊙, indicating massive accreting primaries in five of them. Most sources accrete at rates lower than the expected secular value for their orbital period. Formerly proposed as a long-period (9.4 h) nova-like CV, Swift J0746.3-1608 shows peculiar spectrum and light curves suggesting either an atypical low-luminosity CV or a low-mass X-ray binary.

    Original languageEnglish (US)
    Pages (from-to)4815-4837
    Number of pages23
    JournalMonthly Notices of the Royal Astronomical Society
    Volume470
    Issue number4
    DOIs
    StatePublished - Oct 1 2017

    Fingerprint

    cataclysmic variables
    broadband
    x rays
    orbitals
    modulation
    XMM-Newton telescope
    spectral analysis
    newton
    light curve
    spectrum analysis
    photometry
    luminosity
    time measurement
    curves
    pulses

    Keywords

    • 1608 (aka 1RXS J074616.8-161127)
    • 4304 (aka IGR J17014-4306)
    • 462324)
    • 4625 (aka 1RXS J080114.6
    • 6945
    • Novae, Cataclysmic variables
    • White dwarfs
    • X-rays: binaries
    • X-rays: individual: PBC J0801.2
    • X-rays: individual: Swift J0706.8+0325
    • X-rays: individual: Swift J0746.3
    • X-rays: individual: Swift J0927.7
    • X-rays: individual: Swift J0958.0-4208
    • X-rays: individual: Swift J1701.3
    • X-rays: individual: Swift J2113.5+5422

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Bernardini, F., de Martino, D., Mukai, K., Russell, D., Falanga, M., Masetti, N., ... Israel, G. (2017). Broad-band characteristics of seven new hard X-ray selected cataclysmic variables. Monthly Notices of the Royal Astronomical Society, 470(4), 4815-4837. https://doi.org/10.1093/mnras/stx1494

    Broad-band characteristics of seven new hard X-ray selected cataclysmic variables. / Bernardini, F.; de Martino, D.; Mukai, K.; Russell, Dave; Falanga, M.; Masetti, N.; Ferrigno, C.; Israel, G.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 470, No. 4, 01.10.2017, p. 4815-4837.

    Research output: Contribution to journalArticle

    Bernardini, F, de Martino, D, Mukai, K, Russell, D, Falanga, M, Masetti, N, Ferrigno, C & Israel, G 2017, 'Broad-band characteristics of seven new hard X-ray selected cataclysmic variables', Monthly Notices of the Royal Astronomical Society, vol. 470, no. 4, pp. 4815-4837. https://doi.org/10.1093/mnras/stx1494
    Bernardini, F. ; de Martino, D. ; Mukai, K. ; Russell, Dave ; Falanga, M. ; Masetti, N. ; Ferrigno, C. ; Israel, G. / Broad-band characteristics of seven new hard X-ray selected cataclysmic variables. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 470, No. 4. pp. 4815-4837.
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    author = "F. Bernardini and {de Martino}, D. and K. Mukai and Dave Russell and M. Falanga and N. Masetti and C. Ferrigno and G. Israel",
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    T1 - Broad-band characteristics of seven new hard X-ray selected cataclysmic variables

    AU - Bernardini, F.

    AU - de Martino, D.

    AU - Mukai, K.

    AU - Russell, Dave

    AU - Falanga, M.

    AU - Masetti, N.

    AU - Ferrigno, C.

    AU - Israel, G.

    PY - 2017/10/1

    Y1 - 2017/10/1

    N2 - We present timing and spectral analysis of a sample of seven hard X-ray selected cataclysmic variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton, complemented with Swift/BAT and INTEGRAL /IBIS hard X-ray data and ground-based optical photometry. For six sources, X-ray pulsations are detected for the first time in the range of ∼296-6098 s, identifying them as members of the magnetic class. Swift J0927.7-6945, Swift J0958.0-4208, Swift J1701.3-4304, Swift J2113.5+5422 and ossibly PBC J0801.2-4625 are intermediate polars (IPs), while Swift J0706.8+0325 is a short (1.7 h) orbital period polar, the 11th hard X-ray-selected identified so far. X-ray orbital modulation is also observed in Swift J0927.7-6945 (5.2 h) and Swift J2113.5+5422 (4.1 h). Swift J1701.3-4304 is discovered as the longest orbital period (12.8 h) deep eclipsing IP. The spectra of the magnetic systems reveal optically thin multitemperature emission between 0.2 and 60 keV. Energy-dependent spin pulses and the orbital modulation in Swift J0927.7-6945 and Swift J2113.5+5422 are due to intervening local high-density absorbing material (NH ∼ 1022 - 23 cm-2). In Swift J0958.0-4208 and Swift J1701.3-4304, a soft X-ray blackbody (kT ∼ 50 and ∼80 eV) is detected, adding them to the growing group of 'soft' IPs. White dwarf masses are determined in the range of ∼0.58-1.18M⊙, indicating massive accreting primaries in five of them. Most sources accrete at rates lower than the expected secular value for their orbital period. Formerly proposed as a long-period (9.4 h) nova-like CV, Swift J0746.3-1608 shows peculiar spectrum and light curves suggesting either an atypical low-luminosity CV or a low-mass X-ray binary.

    AB - We present timing and spectral analysis of a sample of seven hard X-ray selected cataclysmic variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton, complemented with Swift/BAT and INTEGRAL /IBIS hard X-ray data and ground-based optical photometry. For six sources, X-ray pulsations are detected for the first time in the range of ∼296-6098 s, identifying them as members of the magnetic class. Swift J0927.7-6945, Swift J0958.0-4208, Swift J1701.3-4304, Swift J2113.5+5422 and ossibly PBC J0801.2-4625 are intermediate polars (IPs), while Swift J0706.8+0325 is a short (1.7 h) orbital period polar, the 11th hard X-ray-selected identified so far. X-ray orbital modulation is also observed in Swift J0927.7-6945 (5.2 h) and Swift J2113.5+5422 (4.1 h). Swift J1701.3-4304 is discovered as the longest orbital period (12.8 h) deep eclipsing IP. The spectra of the magnetic systems reveal optically thin multitemperature emission between 0.2 and 60 keV. Energy-dependent spin pulses and the orbital modulation in Swift J0927.7-6945 and Swift J2113.5+5422 are due to intervening local high-density absorbing material (NH ∼ 1022 - 23 cm-2). In Swift J0958.0-4208 and Swift J1701.3-4304, a soft X-ray blackbody (kT ∼ 50 and ∼80 eV) is detected, adding them to the growing group of 'soft' IPs. White dwarf masses are determined in the range of ∼0.58-1.18M⊙, indicating massive accreting primaries in five of them. Most sources accrete at rates lower than the expected secular value for their orbital period. Formerly proposed as a long-period (9.4 h) nova-like CV, Swift J0746.3-1608 shows peculiar spectrum and light curves suggesting either an atypical low-luminosity CV or a low-mass X-ray binary.

    KW - 1608 (aka 1RXS J074616.8-161127)

    KW - 4304 (aka IGR J17014-4306)

    KW - 462324)

    KW - 4625 (aka 1RXS J080114.6

    KW - 6945

    KW - Novae, Cataclysmic variables

    KW - White dwarfs

    KW - X-rays: binaries

    KW - X-rays: individual: PBC J0801.2

    KW - X-rays: individual: Swift J0706.8+0325

    KW - X-rays: individual: Swift J0746.3

    KW - X-rays: individual: Swift J0927.7

    KW - X-rays: individual: Swift J0958.0-4208

    KW - X-rays: individual: Swift J1701.3

    KW - X-rays: individual: Swift J2113.5+5422

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