The Chandra Observatory has discovered a white dwarf star emitting supersoft X-rays, calling into question conventional wisdom about how X-rays are produced by dying stars. The star ASASSN-16oh is producing supersoft X-rays that are not due to fusion, but instead due to hot gasses in the accretion disk.
Source: White Dwarf Star Unexpectedly Emitting Supersoft X-Rays | Digital Trends
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