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We study formation of 9:7 mean motion resonance (MMR) as a result ofconvergent migration of two planets embedded in a disc. Depending on themigration parameters, initial orbits and planets' masses the system may passthrough the resonance or enter it (permanently or temporarily). We illustratethat a stable equilibrium of the averaged system (a periodic orbit of theN-body model) is surrounded by the region of permanent resonance capture, whosesize depends on the migration parameters and the planets mass ratio. A systemlocated inside this region tends towards the equilibrium (the capture ispermanent), while a system located outside the region evolves away from theequilibrium and leaves the resonance. We verify recent results of Delisle etal. and Xu & Lai where they show that for $m_1 \lesssim m_2$ ($m_1, m_2$ arethe inner and outer planets' masses) the equilibrium is unstable when themigration is added, so the capture cannot be permanent. We show that forparticular migration parameters the situation may be reversed (the equilibriaare unstable for $m_1 \gtrsim m_2$). We illustrate that 9:7 MMR consists of twomodes separated with a separatrix. The inner one is centred at the equilibriumand the outer one has no equilibrium in its centre. A system located outsidethe region of stable capture evolves from the inner into the outer mode. Theevolution occurs along families of periodic orbits of the averaged system, thatplay a crucial role in the dynamics after the resonance capture.

On the migration-induced formation of the 9:7 mean motion resonance