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Based on TESS data, the existence of uneven stellar matter has been revealed

Credit: Pixabay / CC0 Public Domain

Researchers from the Yunnan Observatories of the Chinese Academy of Sciences have found unusual variations in successive luminosity curves of the transit satellite for the exoplanet survey (TESS) of the ultra-soft X-ray source V Sge. This is the first evidence that there may be uneven near-star matter around the ultra-soft source of X-rays.


This work has been published in Monthly reports of the Royal Astronomical Society February 2.

V Sge is a unique eclipse double cataclysm and recognized as a super-soft X-ray source, consisting of a compact main component of the white dwarf and a star of the main sequence star. The white dwarf is continuously gaining mass from the satellite through increase drive.

To further study their mass exchange and the final evolution of the orbit, the researchers tracked them with a one-meter telescope at the Yunnan Observatories and then obtained minimal eclipse times.

Combined with a more continuous TESS light curve, the researchers analyzed in detail the variation of the V Sge orbit period. As a result, the orbital period is continuously decreasing, suggesting that a more massive satellite transmits material to the white dwarf during its evolution in the thermal time scale, and possible mass loss from the accretion disk takes away the angular momentum of this system.

Based on the results of the orbital period analysis, the researchers derived the latest velocity orbital period changes for this system and then, in the case of subsequent angular momentum loss (CAML) caused by wind accretion disk, they estimated the range of mass transfer rate and mass build-up rate. Moreover, it can be roughly estimated that V Sge could reach the Chandrasekhar limit in at least 1 million years and then explode as a supernova type Ia.

In addition, researchers have found evidence of the existence of uneven stellar matter surrounding an ultra-soft X-ray source. They found that there are peculiar and irregular changes in the more continuous light curve TESS V Sge, which may be caused by the effect of extinction of non-uniform stellar matter and dynamic changes in shape accretion disk edge.

These options give researchers the opportunity to understand mass transfer and wt the ejection process is better. However, the law of these variations and the mechanism that leads to them have yet to be confirmed.


Researchers obtain special photometric behavior of a system similar to the new one, and confirm evidence of wind in the disk


Additional information:
Lei Zang et al., Photometric study of the ultra-soft X-ray source V Sge based on TESS data, Monthly reports of the Royal Astronomical Society (2022). DOI: 10.1093 / mnras / stac047

Citation: Based on TESS data (2022, February 15), the existence of uneven near-star matter was obtained, obtained on February 15, 2022 from https://phys.org/news/2022-02-uneven-circumstellar-based-tess.html

This document is subject to copyright. Except for any honest transaction for the purpose of private study or research, no part may be reproduced without written permission. The content is provided for informational purposes only.



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Based on TESS data, the existence of uneven stellar matter has been revealed

Credit: Pixabay / CC0 Public Domain

Researchers from the Yunnan Observatories of the Chinese Academy of Sciences have found unusual variations in successive luminosity curves of the transit satellite for the exoplanet survey (TESS) of the ultra-soft X-ray source V Sge. This is the first evidence that there may be uneven near-star matter around the ultra-soft source of X-rays.


This work has been published in Monthly reports of the Royal Astronomical Society February 2.

V Sge is a unique eclipse double cataclysm and recognized as a super-soft X-ray source, consisting of a compact main component of the white dwarf and a star of the main sequence star. The white dwarf is continuously gaining mass from the satellite through increase drive.

To further study their mass exchange and the final evolution of the orbit, the researchers tracked them with a one-meter telescope at the Yunnan Observatories and then obtained minimal eclipse times.

Combined with a more continuous TESS light curve, the researchers analyzed in detail the variation of the V Sge orbit period. As a result, the orbital period is continuously decreasing, suggesting that a more massive satellite transmits material to the white dwarf during its evolution in the thermal time scale, and possible mass loss from the accretion disk takes away the angular momentum of this system.

Based on the results of the orbital period analysis, the researchers derived the latest velocity orbital period changes for this system and then, in the case of subsequent angular momentum loss (CAML) caused by wind accretion disk, they estimated the range of mass transfer rate and mass build-up rate. Moreover, it can be roughly estimated that V Sge could reach the Chandrasekhar limit in at least 1 million years and then explode as a supernova type Ia.

In addition, researchers have found evidence of the existence of uneven stellar matter surrounding an ultra-soft X-ray source. They found that there are peculiar and irregular changes in the more continuous light curve TESS V Sge, which may be caused by the effect of extinction of non-uniform stellar matter and dynamic changes in shape accretion disk edge.

These options give researchers the opportunity to understand mass transfer and wt the ejection process is better. However, the law of these variations and the mechanism that leads to them have yet to be confirmed.


Researchers obtain special photometric behavior of a system similar to the new one, and confirm evidence of wind in the disk


Additional information:
Lei Zang et al., Photometric study of the ultra-soft X-ray source V Sge based on TESS data, Monthly reports of the Royal Astronomical Society (2022). DOI: 10.1093 / mnras / stac047

Citation: Based on TESS data (2022, February 15), the existence of uneven near-star matter was obtained, obtained on February 15, 2022 from https://phys.org/news/2022-02-uneven-circumstellar-based-tess.html

This document is subject to copyright. Except for any honest transaction for the purpose of private study or research, no part may be reproduced without written permission. The content is provided for informational purposes only.



Reported by Source link

RELATED ARTICLES
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Most Popular