Researchers at the Yunnan Astronomical Observatory of the Chinese Academy of Sciences have discovered anomalous changes in the light curve of the continuous Transiting Exoplanet Exploration Satellite (TESS) of the super-soft X-ray source VSge. This is the first evidence to reveal that there may be non-uniform stellar material around the super soft X-ray source.
This work was published in Monthly Notification of the Royal Astronomical Society February 2.
V Sge is a unique eclipse binary, a recognized ultra-soft X-ray source consisting of the main components of a compact white dwarf and a companion of main sequence stars.White dwarf from the companion Accretion disk.
To further study their mass exchange and the resulting orbital evolution, researchers monitored them at the Yunnan Astronomical Observatory using a 1-meter telescope, and then obtained the minimum timing of the solar eclipse.
Combined with a more continuous TESS light curve, researchers have analyzed VSge’s orbital period variability in detail. This result means that the revolving cycle is continuously decreasing, that the heavier companion is moving matter to the white dwarf during its evolution on the thermal timescale, and from the accretion disk. A system that shows that the possibility of mass loss is depriving this angular momentum.
Based on the results of the orbital period analysis, researchers have derived the latest velocities. Orbital period Modifying this system, in the case of the resulting angular momentum loss (CAML) caused by the wind on the accretion disk, they estimated the range of mass transfer and mass transfer. In addition, it can be estimated that VSge can reach the Chandrasekhar limit at least 1 Myr and then explode as a Type Ia supernova.
In addition, researchers have found evidence of the existence of non-uniform star-circumferential material surrounding the super-soft X-ray source. They found that there was a peculiar and irregular change in the more continuous TESS light curve of V Sge. This is the effect of the disappearance of non-uniform Hase Seishū and Accretion disk edge.
These variations provide researchers with an opportunity to understand Mass transfer When mass The emission process has been improved. However, the laws of these fluctuations and the mechanisms that bring them about need to be further investigated.
Lei Zang et al, Photometric study of super soft X-ray source VSge based on TESS data, Monthly Notification of the Royal Astronomical Society (2022). DOI: 10.1093 / mnras / stac047
Chinese Academy of Sciences
Quote: Found based on TESS data (February 15, 2022) obtained from //phys.org/news/2022-02-uneven-circumstellar-based-tess.html on February 15, 2022 Presence of non-uniform stellar material
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Existence of non-uniform Hase Seishū discovered based on TESS data
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