Clumpy wind studies and the non-detection of cyclotron line in OAO 1657-415
arXiv:2302.10939 · doi:10.3847/1538-4357/acb2cb
Abstract
Winds of massive stars are suspected to be inhomogeneous (or clumpy), which biases the measures of their mass loss rates. In High Mass X-ray Binaries (HMXBs), the compact object can be used as an orbiting X-ray point source to probe the wind and constrain its clumpiness. We perform spectro-timing analysis of the HMXB OAO 1657-415 with non-simultaneous NuSTAR and NICER observations. We compute the hardness ratio from the energy-resolved light curves, and using an adaptive rebinning technique, we thus select appropriate time segments to search for rapid spectral variations on timescales of a few hundreds to thousands of seconds. Column density and intensity of Iron K line were strongly correlated, and the recorded spectral variations were consistent with accretion from a clumpy wind. We also illustrate a novel framework to measure clump sizes, masses in HMXBs more accurately based on absorption measurements and orbital parameters of the source. We then discuss the limitations posed by current X-ray spacecrafts in such measurements and present prospects with future X-ray missions. We find that the source pulse profiles show a moderate dependence on energy. We identify a previously undetected dip in the pulse profile visible throughout the NuSTAR observation near spin phase 0.15 possibly caused by intrinsic changes in accretion geometry close to the neutron star. We do not find any evidence for the debated cyclotron line at 36\,keV in the time-averaged or the phase-resolved spectra with NuSTAR.
arXiv comment32 pages, 11 figures in main text, 7 figures in Appendix, Accepted for publication in ApJ
References in corpus (65)
- On the Absorption of X-rays in the Interstellar Medium
- The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
- A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
- An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
- Mass loss from hot massive stars
- Studies in Astronomical Time Series Analysis. VI. Bayesian Block Representations
- Optimal binning of X-ray spectra and response matrix design
- An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
- Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13
- Discovery of coherent pulsations from the Ultraluminous X-ray Source NGC 7793 P13
- Thermal and Bulk Comptonization in Accretion-Powered X-Ray Pulsars
- Discovery of pulsations from NGC 300 ULX1 and its fast period evolution
- Cyclotron lines in highly magnetized neutron stars
- High-Mass X-ray Binaries in the Milky Way: A closer look with INTEGRAL
- Are There Magnetars in High Mass X-ray Binaries? The Case of SuperGiant Fast X-Ray Transients
- An Empirical Background Model for the NICER X-ray Timing Instrument
- The ephemeris, orbital decay, and masses of 10 eclipsing HMXBs
- Propeller effect in action in the ultraluminous accreting magnetar M82 X-2
- Chandra observation of the fast X-ray transient IGR J17544-2619: evidence for a neutron star?
- Towards a unified view of inhomogeneous stellar winds in isolated supergiant stars and supergiant high mass X-ray binaries
- Corona, Jet, and Relativistic Line Models for Suzaku/RXTE/Chandra-HETG Observations of the Cygnus X-1 Hard State
- Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray variability and photoionization
- 2D wind clumping in hot, massive stars from hydrodynamical line-driven instability simulations using a pseudo-planar approach
- The structure of blue supergiant winds and the accretion in supergiant High Mass X-ray Binaries
- Observatory science with eXTP
- Orbital Decay and Evidence of Disk Formation in the X-ray Binary Pulsar OAO 1657-415
- Accretion form a clumpy massive-star wind in Supergiant X-ray binaries
- A detailed X-ray investigation of zeta Puppis - The variability on short and long timescales
- Formation of wind-captured discs in Supergiant X-ray binaries : consequences for Vela X-1 and Cygnus X-1
- Long term variability of Cygnus X-1: VII. Orbital variability of the focussed wind in Cyg X-1 / HDE 226868 system
- The clumpy absorber in the high-mass X-ray binary Vela X-1
- X-ray emission from magnetized neutron star atmospheres at low mass accretion rates. I. Phase-averaged spectrum
- INTEGRAL observations of the variability of OAO 1657-415
- The evolution and masses of the neutron star and donor star in the high mass X-ray binary OAO 1657-415
- Spectral classification of the mass donors in the high-mass X-ray binaries EXO 1722-363 and OAO 1657-415
- CIR Modulation of the X-ray Flux from the O7.5 III(n)((f)) Star xi Persei?
- Chandra X-ray spectroscopy of the focused wind in the Cygnus X-1 system III. Dipping in the low/hard state
- ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo
- Numerical simulations of axisymmetric hydrodynamical Bondi-Hoyle accretion onto a compact object
- Cyclotron lines: from magnetic field strength estimators to geometry tracers in neutron stars
- Variations in the pulsation and spectral characteristics of OAO 1657-415
- SFXTs versus classical SgXBs: Does the difference lie in the companion wind?
- High-resolution X-ray spectroscopy of the stellar wind in Vela X-1 during a flare
- NuSTAR observations of the wind-fed X-ray pulsar GX 301--2 during an unusual spin-up event
- On the possibility of disk-fed formation in supergiant high-mass X-ray binaries
- The accretion environment of Supergiant Fast X-ray Transients probed with XMM-Newton
- Observing the transient pulsations of SMC X-1 with NuSTAR
- Is superorbital modulation in SMC X-1 caused by absorption in warped precessing accretion disc?
- Multi-wavelength observations of IGR J17544-2619 from quiescence to outburst
- Glancing through the accretion column of EXO 2030+375
- Supergiant Fast X-ray Transients uncovered by the EXTraS project: flares reveal the development of magnetospheric instability in accreting neutron stars
- Looking through the photoionisation wake: Vela X-1 at with Chandra/HETG
- X-ray Polarization from High Mass X-ray Binaries
- Theoretical wind clumping predictions from 2D LDI models of O-star winds at different metallicities
- Accretion of a clumped wind from a red supergiant donor onto a magnetar is suggested by the analysis of the XMM-Newton and NuSTAR observations of the X-ray binary 3A 1954+319
- Discovery of pulsation dropout and turn-on during the high state of the accreting X-ray pulsar LMC X-4
- Color-color diagrams as tools for assessment of the variable absorption in high mass X-ray binaries
- Is 4U 0114+65 an eclipsing HMXB?
- Revisiting SWJ2000.6+3210 : A persistent Be X-ray pulsar ?
- Probing clumpy wind accretion in IGR J18027-2016 with XMM-Newton
- Timing and Spectral Analysis of HMXB OAO 1657-415 with NuSTAR
- Multitude of iron lines including a Compton scattered component in OAO 1657--415 detected with Chandra
- A NuSTAR observation of the eclipsing binary system OAO 1657-415: The revival of the cyclotron line
- Comprehensive broadband study of accreting neutron stars with Suzaku: Is there a bi-modality in the X-ray spectrum?
- AstroSat observations of eclipsing high mass X-ray binary pulsar OAO 1657-415