Long-term stellar activity of M dwarfs - A combined K2 and TESS study of two early M-type stars

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Table 4.

Results of the determination of the differential rotation.

	EPIC 202059229				EPIC 245919787
	TIC 372611670				TIC 434101713

	K2		TESS		K2		TESS

	Spot 1	Spot 2	Spot 1	Spot 2	Spot 1	Spot 2	Spot 1	Spot 2
$P_{rot}^{'}$ $P^\prime_{\mathrm{rot}}$ [d]	5.047 ± 0.019	5.026 ± 0.017	4.984 ± 0.030	4.975 ± 0.047	5.686 ± 0.006	5.600 ± 0.007	5.724 ± 0.035	5.640 ± 0.033
Ω′ [rad/d]	1.245 ± 0.005	1.250 ± 0.004	1.261 ± 0.008	1.263 ± 0.012	1.105 ± 0.001	1.122 ± 0.001	1.098 ± 0.007	1.114 ± 0.007
$Δ Ω' = Ω'_{spot 1} - Ω'_{spot 2}$ $\Delta \Omega\prime=\Omega\prime_{\mathrm{spot1}}-\Omega\prime_{\mathrm{spot2}}$ [rad/d]	0.005 ± 0.006		0.002 ± 0.014		0.017 ± 0.002		0.016 ± 0.009
Average latitude [°]	64.9 ± 0.7	75.8 ± 2.6	68.3 ± 1.6	65.2 ± 2.5	66.6 ± 1.1	77.4 ± 3.9	68.6 ± 0.2	79.8 ± 0.3
$δ Ω'_{Sun}$ $\delta \Omega\prime_{\mathrm{Sun}}$ ^(a) [%]	16.0		4.9		14.4		13.8
ΔΩ_*, 100% [rad/d]	0.032 ± 0.039		0.051 ± 0.291		0.119 ± 0.012		0.118 ± 0.068

⟨ΔΩ⟩ ^(b) [rad/d]	0.032 ± 0.039				0.118 ± 0.012

Notes.

^(a)

$δ Ω'_{Sun}$ $\delta \Omega\prime_{\mathrm{Sun}}$ is the percentage of the full ΔΩ_Sun, 100% of the Sun from pole to equator the ΔΩ′ between the two different latitudes accounts for (see Sect. 6.1.3).

^(b)

⟨ΔΩ⟩ weighted average of ΔΩ_100%,K2 and ΔΩ_100%,TESS.

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