EXOPLANETS

A six-planet system with resonant orbits

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Science  19 Feb 2021:
Vol. 371, Issue 6531, pp. 794-795
DOI: 10.1126/science.371.6531.794-e

Orbital migration during planet formation can produce resonant chains of orbits that are simple multiples of each other. Studying such multiplanet systems provides information on the formation process. Leleu et al. used transit and radial velocity data to investigate a candidate multiple-planet system, TOI-178. They found six planets there, which had looked like three in the initial observations because some of the orbits were simple multiples of each other. Analysis of the extended dataset showed that five of the six planets are in a resonant chain. The planets are all between Earth and Neptune size and are on short orbits with high surface temperatures.

Astron. Astrophys. 10.1051/0004-6361/202039767 (2021).

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