---
res:
  bibo_abstract:
  - We study the interaction of a supermassive black hole (SMBH) binary and a standard
    radiatively efficient thin accretion disk. We examine steady-state configurations
    of the disk and migrating SMBH system, self-consistently accounting for tidal
    and viscous torques and heating, radiative diffusion limited cooling, gas and
    radiation pressure, and the decay of the binary's orbit. We obtain a "phase diagram"
    of the system as a function of binary parameters, showing regimes in which both
    the disk structure and migration have a different character. Although massive
    binaries can create a central gap in the disk at large radii, the tidal barrier
    of the secondary causes a significant pile-up of gas outside of its orbit, which
    can lead to the closing of the gap. We find that this spillover occurs at an orbital
    separation as large as ~200 M_7^{-1/2} gravitational radii, where M = 10^7 M_7
    Msun is the total binary mass. If the secondary is less massive than ~10^6 Msun,
    then the gap is closed before gravitational waves (GWs) start dominating the orbital
    decay. In this regime, the disk is still strongly perturbed, but the piled-up
    gas continuously overflows as in a porous dam, and crosses inside the secondary's
    orbit. The corresponding migration rate, which we label Type 1.5, is slower than
    the usual limiting cases known as Type I and II migration. Compared to an unperturbed
    disk, the steady-state disk in the overflowing regime is up to several hundred
    times brighter in the optical bands. Surveys such as PanSTARRS or LSST may discover
    the periodic variability of this population of binaries. Our results imply that
    the circumbinary disks around SMBHs can extend to small radii during the last
    stages of their merger, when they are detectable by LISA, and may produce coincident
    electromagnetic (EM) emission similar to active galactic nuclei (AGN).@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Bence
      foaf_name: Kocsis, Bence
      foaf_surname: Kocsis
  - foaf_Person:
      foaf_givenName: Zoltán
      foaf_name: Haiman, Zoltán
      foaf_surname: Haiman
      foaf_workInfoHomepage: http://www.librecat.org/personId=7c006e8c-cc0d-11ee-8322-cb904ef76f36
  - foaf_Person:
      foaf_givenName: Abraham
      foaf_name: Loeb, Abraham
      foaf_surname: Loeb
  bibo_doi: 10.1111/j.1365-2966.2012.22118.x
  bibo_issue: '3'
  bibo_volume: 427
  dct_date: 2012^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0035-8711
  - http://id.crossref.org/issn/1365-2966
  dct_language: eng
  dct_publisher: Oxford University Press@
  dct_title: 'Gas pile-up, gap overflow and Type 1.5 migration in circumbinary discs:
    Application to supermassive black hole binaries@'
...