The longest-period M dwarf exoplanet found orbiting TOI 904

23. 10. 2023 (accepted)

The longest-period M dwarf exoplanet found orbiting TOI 904

Star system: TOI 904 | Distance from the Sun: 150 light years

Two new sub-Neptunes, TOI-904 b and c, have been discovered orbiting the early M dwarf TOI-904. The outer planet, TOI-904 c, is the longest-period M dwarf exoplanet found by TESS, with period 84 days and an estimated equilibrium temperature of 217 K. Future mass measurements and transmission spectroscopy of the similar-sized planets in this system could determine whether they are also similar in density and composition, suggesting a common formation pathway, or whether they have distinct origins.

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Separated twins or just siblings? A multi-planet system around an M dwarf including a cool sub-Neptune external link

Stars mentioned

TOI 904

Red dwarf

mass: 0.56 M☉

radius: 0.3 R☉

distance: 150 ly

stars in the system: 1

exoplanets: 2

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