Binary Star Habitable Zone Calculator
☀ Updated to Account for New Planetary Climate Models ☀
BinHab allows for the calculation of S-type and P-type habitable regions in
stellar binary systems. P-type orbits occur when the planet orbits
both binary components, whereas in the case of S-type orbits the planet
orbits only one of the binary components, with the second component
considered a perturbator. The selected approach considers a variety of aspects, which include:
In principle, five different cases of habitability are
identified, which are: S-type and P-type habitability provided by the
full extent of the RHZs; habitability, where the RHZs are truncated by
the additional constraint of planetary orbital stability (referred to
as ST and PT-type, respectively, for Truncated); and cases of no habitability at all.
Regarding the treatment of planetary orbital stability, the formulae
of Holman & Wiegert (1999) [AJ 117, 621] are utilized.
- Besides simple cases, the treatment of nonequal-mass systems
and systems in elliptical orbits.
- The consideration of a joint
constraint, including orbital stability and a habitable region for
a putative system planet through the stellar radiative energy fluxes
("radiative habitable zone"; RHZ), needs to be met.
- The provision
of a combined formalism for the assessment of both S-type and P-type
habitability; in particular, through the solution of a fourth-order
polynomial, mathematical criteria are employed for the kind of system
in which S-type and P-type habitability is realized.
- The consideration of classical or revised planetary climate models;
in the latter case, the stellar RHZ may also depend on the planetary
- The user-friendly option to choose different inner and outer limits
for stellar RHZs. According to existing literature, those can be
readily related to the conservative (CHZ), general (GHZ), or
extended zone (EHZ) of habitability for the various systems as
defined for the Solar System and beyond.
2. Calculating the Habitable Zone - Enter Binary System Parameters