{
  "id": "1204.3173",
  "version": "v2",
  "published": "2012-04-14T13:45:45.000Z",
  "updated": "2012-05-05T13:25:07.000Z",
  "title": "Merger by Migration at the Final Phase of Common Envelope Evolution",
  "authors": [
    "Noam Soker"
  ],
  "comment": "New Astronomy, in press",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "I find the common envelope (CE) energy formalism, the CE \\alpha-prescription, to be inadequate to predict the final orbital separation of the CE evolution in massive envelopes. I find that when the orbital separation decreases to ~10 times the final orbital separation predicted by the CE \\alpha-prescription, the companion has not enough mass in its vicinity to carry away its angular momentum. The core-secondary binary system must get rid of its angular momentum by interacting with mass further out. The binary system interacts gravitationally with a rapidly-rotating flat envelope, in a situation that resembles planet-migration in protoplanetary disks. The envelope convection of the giant carries energy and angular momentum outward. The basic assumption of the CE \\alpha-prescription, that the binary system's gravitational energy goes to unbind the envelope, breaks down. Based on that, I claim that merger is a common outcome of the CE evolution of AGB and red super-giants stars with an envelope to secondary mass ratio of (M_env/M_2)>~5. I discuss some other puzzling observations that might be explained by the migration and merger processes.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-05-05T13:25:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "common envelope evolution",
      "final phase",
      "final orbital separation",
      "angular momentum",
      "ce evolution"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1016/j.newast.2012.05.001",
      "journal": "New Astronomy",
      "year": 2013,
      "month": "Jan",
      "volume": 18,
      "pages": 18
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1110927,
      "adsabs": "2013NewA...18...18S"
    }
  }
}