Zeta Ophiuchi is a runaway star, zipping through space at a ridiculous 160,000 km/hr. Scientists now believe that Zeta Ophiuchi was kicked across space by the supernova explosion of a binary companion star. 📷 NASA/CXC/Univ. of Cambridge et al
Because Zeta Ophiuchi is so well known, we do know a fair bit about it. For example, images show a colossal bow shock in the thick cloud through which the star is traveling. This is created by material blowing from the star and colliding with the gas.And X-ray emission around the star was detected in observations from Chandra in 2016 – thermal emission, created by shock-induced heating.
A new study led by computational astrophysicist Samuel Green from the Dublin Institute for Advanced Studies in Ireland has delved into the multi-wavelength data to see if bow shock dynamics can explain the observed cloud, as well as the thermal emission. That includes observations across optical, infrared, radio, and X-ray wavelengths.
They conducted simulations and found that their results don't match the observations. The brightest X-radiation in the Chandra data is emitted from a bubble that surrounds the star. In the simulations, the brightest X-rays were in the bow shock itself. This suggests that something is missing either in the simulations or our understanding of the strange star and its environment.
Future simulations will throw more physical processes into the mix or will be conducted at higher resolutions to better model the turbulence involved.
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