Novel application to estimate the mass-loss and the dust-formation rates in O-type gamma-ray binaries using near-infrared photometry

Abstract

We have performed the near-infrared photometric monitoring observations of two TeV gamma-ray binaries with O-stars (LS 5039 and 1FGL J1018.6-5856), using IRSF/SIRIUS at SAAO, in order to study the stellar parameters and their perturbations caused by the binary interactions. The whole orbital phase was observed multiple times and no significant variabilities including orbital modulations are detected for both targets. Assuming that the two systems are colliding wind binaries, we estimate the amplitude of flux variation caused by the difference in the optical depth of O-star wind at inferior conjunction, where the star is seen through the cavity created by pulsar wind, and other orbital phases without pulsar-wind intervention. The derived amplitude is <0.001 mag, which is about two orders of magnitude smaller than the observed upper limit. Also using the upper limits of the near-infrared variability, we for the first time obtain the upper limit of the dust formation rate resulting from wind-wind collision in O-star gamma-ray binaries.

7 figures, 2 tables, Accepted to publications in PASJ

References in corpus (16)

• Gamma-ray binaries: pulsars in disguise ?
• Accurate determination of the free-free Gaunt factor; I - non-relativistic Gaunt factors
• Orbital X-Ray Variability of the Microquasar LS 5039
• Confirmation of persistent radio jets in the microquasar LS 5039
• New predictions for radiation-driven, steady-state mass-loss and wind-momentum from hot, massive stars. I. Method and first results
• Orbital evolution of colliding star and pulsar winds in 2D and 3D; effects of: dimensionality, EoS, resolution, and grid size
• Sign of hard X-ray pulsation from the gamma-ray binary system LS 5039
• Pulsar model of the high energy phenomenology of LS 5039
• NuSTAR observation of LS 5039
• Relativistic fluid modelling of gamma-ray binaries. II. Application to LS 5039
• Theoretical wind clumping predictions from 2D LDI models of O-star winds at different metallicities
• Stagnant Shells in the Vicinity of the Dusty Wolf-Rayet-OB Binary WR 112
• The orbit of the gamma-ray binary 1FGL J1018.6-5856
• Improved binary solution for the gamma-ray binary 1FGL J1018.6-5856
• Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars
• Near-infrared Brightening around the Periastron Passages of the Gamma-ray Binary PSR B1259$-$63 /LS 2883