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Aims: The hard and soft spectral states of black hole accretion areunderstood as connected with ADAF accretion (truncated disk) and standard diskaccretion, respectively. However, observations indicate the existence of coolgas in the inner region at times when the disk is already truncated outside. Wetry to shed light on these not yet understood intermediate states. Methods: Thedisk-corona model allows to understand the spectral state transitions as causedby changes of the mass flow rate in the disk and provides a picture for theaccretion geometry when disk truncation starts at the time of the soft/hardtransition, the formation of a gap in the disk filled by an advection-dominatedflow (ADAF) at the distance where the evaporation is maximal. We study theinteraction of such an ADAF with an inner thin disk below. Results: We showthat, when the accretion rate is not far below the transition rate, an innerdisk could exist below an ADAF, leading to an intermediate state of black holeaccretion.Comment: 4 pages, 1 figure. Accepted for publication in A&A Letter

An inner disk below the ADAF: the intermediate spectral state of black hole accretion