Habitable Zones for 1 Earth mass planet Habitable Zones for multi-mass planets

** Calculation of Habitable Zones **
Enter stellar effective temperature and luminosity (Default is Sun).

If you don't know the luminosity, just enter T_{eff} and keep luminosity = 0.

That will give you just Habitable stellar flux boundaries.

(If you want to calculate HZs for a number of stars, download this fortran code) . Table of Coefficients can also be downloaded.

(A python version of the code (courtesy John Armstrong at Weber State, is also available).

After entering the values in each box, just click inside each box to obtain the results.

T_{eff} (K)
Stellar Luminosity (solar units)

The following limits are for 5 Earth mass and 0.1 Earth mass planets. The
inner edge of the HZ (in the units of stellar fluxes) moves closer to the star by about +7%
for a 5 Earth mass planet, compared to
the inner edge for an Earth mass planet (see above table). For a 0.1 Earth mass planet, the inner
edge moves * away * from the star by
- 10%, compared to the inner edge flux for an Earth mass planet. The outer edge of the HZ does not
change in any appreciable way. So for the outer edge, use the 1 Earth mass (conservative and optimistic) limits.

CAVEAT:
We assume that for these planets, the background Nitrogen gas pressure scales according
to the planetary gravity. We should caution that volatile delivery to a planet is stochastic in nature, and may be a weak
function of planetary mass. Still, this is the best assumption we can make in the absence of a
rigorous theory of how planetary volatile content varies with planet mass.
So, please keep this in mind when using the following limits.
See Kopparapu et al.(2014) for more details.

If you use this calculator or the FORTRAN code, please cite the following publications:

"Habitable Zones Around Main-Sequence Stars: New Estimates" by Kopparapu et al.(2013), *Astrophysical Journal, 765, 131* arXiv link

"Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass" by Kopparapu et al.(2014), *Astrophysical Journal Letters, 787, L29* arXiv link