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I am making a hypothetical solar system. I want to know where the star's habitable zone would be located (in AU). Here are the characteristics:

  • Star name: Undecided
  • Star designation (preliminary): TOI-3173 b
  • Star Type: M
  • Spectral Type: M2.5Ve(m)(v). (This star emits emission lines, is rich in metals, and is a variable star.)
  • Mass: 0.393 Suns
  • Radius: 0.42 x Sun
  • Temperature: 3,455°K
  • Luminosity: 0.02255 Suns
  • Age: 1.6 Gyr
  • Variable type: Flare star

The habitable zone parameters are realistic and are in this universe.

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    $\begingroup$ To really answer this, information about the planet is also needed (a least size and approx. desired revolving time, if this is fixated). Also: what does the variabel star imply? Is it in a strength that its heat/light emitting characteristics are influenced? -- In general you can say that if your planet system is based on our solarsystem but scaled smaller, the habitable zone also scales linearly with that factor. $\endgroup$
    – Antares
    Commented Sep 29 at 15:08
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    $\begingroup$ Also check this question to maybe compute/approximate yourself: worldbuilding.stackexchange.com/questions/246738/… $\endgroup$
    – Antares
    Commented Sep 29 at 15:11
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    $\begingroup$ Thank you for the extra forums! $\endgroup$
    – Anonymous
    Commented Sep 29 at 15:12
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    $\begingroup$ I think, I cannot really tell, because your are inventing the world. I/we try to give it "scientific plausibility". But I don't know what are the fix points your story needs. You should maybe add that to the question text. $\endgroup$
    – Antares
    Commented Sep 29 at 15:13
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    $\begingroup$ Thanks. I will add that to the question. $\endgroup$
    – Anonymous
    Commented Sep 29 at 15:15

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Assuming an earthlike world, you haven't said anything different, this handy calculator gives us 0.14-0.21 AU as a theoretical habitable zone. I would like to note though that for a world orbiting a flare star there is likely no such thing as a habitable zone for surface life, the radiation flux is far too high, even Radiodurans has it's limits, not to mention the longterm effects of frequent, powerful, flares on the atmosphere. So while your world may have shielded ecosystems in deep caves etc... complex surface life is almost certainly a no.

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