description TOI-178 d Overview
TOI-178 d is a transiting exoplanet orbiting the late K-type star TOI-178, whose system contains six known transiting planets. It has a radius of about 2.3 times Earth's and a low measured density, consistent with a substantial volatile or gaseous envelope rather than a purely rocky composition. With an orbital period of about 6.6 days, it is one of the outer planets in the system's Laplace-resonance chain.
help TOI-178 d FAQ
How long is TOI-178 d's orbit?
TOI-178 d takes roughly 6.6 days to orbit its late K-type star. It is larger than Earth and falls in the sub-Neptune size range. ([NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-178))
Why is TOI-178 d notable for its low density?
Its measured density is far lower than TOI-178 c's despite the planets being neighbors in the same compact system. That result is consistent with TOI-178 d retaining a substantial volatile or gaseous envelope.
Is TOI-178 d part of the Laplace-resonance chain?
Yes, TOI-178 d is one of the planets in the c-through-g resonance chain. The chain links the orbital periods of c, d, e, f, and g through repeated integer relationships.
How was TOI-178 d found?
TOI-178 d is a transiting exoplanet, so astronomers detect it from repeated dips in the light of TOI-178. The system contains six known transiting planets.
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