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

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.
@article{d469b5b76bc84589b8de799619d3e3a9,
title = "Broad-band characteristics of seven new hard X-ray selected cataclysmic variables",
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.",
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",
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",
year = "2017",
month = "10",
day = "1",
doi = "10.1093/mnras/stx1494",
language = "English (US)",
volume = "470",
pages = "4815--4837",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=85026320425&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85026320425&partnerID=8YFLogxK

U2 - 10.1093/mnras/stx1494

DO - 10.1093/mnras/stx1494

M3 - Article

AN - SCOPUS:85026320425

VL - 470

SP - 4815

EP - 4837

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -