Kavli Affiliate: David Charbonneau
| First 5 Authors: Edward M. Bryant, Andrés Jordán, Joel D. Hartman, Daniel Bayliss, Elyar Sedaghati
| Summary:
Planet formation models suggest that the formation of giant planets is
significantly harder around low-mass stars, due to the scaling of
protoplanetary disc masses with stellar mass. The discovery of giant planets
orbiting such low-mass stars thus imposes strong constraints on giant planet
formation processes. Here, we report the discovery of a transiting giant planet
orbiting a $0.207 pm 0.011 M_{odot}$ star. The planet, TOI-6894 b, has a mass
and radius of $M_P = 0.168 pm 0.022 M_J (53.4 pm 7.1 M_{oplus})$ and $R_P =
0.855 pm 0.022 R_J$, and likely includes $12 pm 2 M_{oplus}$ of metals. The
discovery of TOI-6894 b highlights the need for a better understanding of giant
planet formation mechanisms and the protoplanetary disc environments in which
they occur. The extremely deep transits (17% depth) make TOI-6894 b one of the
most accessible exoplanetary giants for atmospheric characterisation
observations, which will be key for fully interpreting the formation history of
this remarkable system and for the study of atmospheric methane chemistry.
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