Is Sirius, 8.6 light years away from the Earth, really a livable planet?

Sirius is a star near the solar system, about 8.6 light years away. Sirius is a binary star system with two stars, of which Sirius A is the main sequence star visible to the naked eye and Sirius B is a white dwarf, which has reached the final stage of the star. So far, astronomers have discovered more than 4,000 exoplanets, some of which may be located in the habitable areas of their star systems. For example, our nearest neighbor b(4.2 light years) is such a potentially livable planet.

In addition, according to the situation of the earth, if there are planets around Sirius B, then they must be uninhabitable. Because Sirius B expanded into a red giant and then evolved into a white dwarf about 6,543.8 billion years ago, this process would destroy any livable planet. In addition, according to the situation of the earth, if there are planets around Sirius B, then they must be uninhabitable. Because Sirius B expanded into a red giant about 6,543.8 billion years ago and then evolved into a white dwarf,

This process will destroy any livable planet. If there are planets around Sirius A, only planets about 5.04 astronomical units away from Sirius A are likely to have liquid water on their surfaces like the Earth. Because Sirius A's luminosity is 25.4 of the sun's, its livable zone is farther than the radius of the earth's orbit. Only in this way can the planet get proper heat to maintain liquid water on the surface.

However, the planets that may exist in Sirius A's livable zone are basically impossible to be livable. Sirius B's predecessor star has a mass of about 5 times that of the sun and a luminosity of about 420 times that of the sun (the greater the mass of the planet, the higher the luminosity and the shorter its life span), which means that its livable zone is about 20.5 astronomical units away from it. However, the closest distance between Sirius A and Sirius B is only 8 astronomical units. Sirius B will become very hot after expanding into a red giant in his later years, which will lead to the possible planets in Sirius A's livable zone becoming overheated, instead of being as livable as the earth.