11:00 AM - 11:15 AM
[PEM11-07] Investigation of the dependence of close-in giant planet formation on stellar mass by deriving the occurrence rate.
Keywords:Giant planet, Low-mass star, Occurrence rate
Among eleven M dwarfs with close-in giant planets, all but TOI-519 are early-M dwarfs, and nine of them are massive M dwarfs with Ms > 0.5 Msun. This dependence on the stellar mass appears to be consistent with the prediction of the core accretion model. However, in order to confirm the stellar mass dependence of close-in giant planet formation, it is necessary to consider not only the number of discoveries but also the occurrence rate. In Gan et al, 2022, the occurrence rate of close-in giant planets around early-M dwarfs discovered by TESS is derived. They suggest that the occurrence rate of close-in giant planets around early-M dwarfs tends to be smaller than that around solar-type stars.
We derive the occurrence rate of close-in giant planets around mid-M dwarfs using the completeness of Gan et al. 2022. The only close-in giant planet around a mid-M dwarf discovered so far is TOI-519b, but several planet candidates have been discovered by TESS, so we also derive the occurrence rate including them.
In this talk, we discuss the dependence of the formation of close-in giant planets on the stellar mass by comparing the occurrence rate of close-in giant planets around early-M dwarfs with that around mid-M dwarfs.