Poster Open Access

Probing the magnetospheric accretion region of the young system DoAr 44 using VLTI/GRAVITY

Bouvier Jerome; Perraut Karine; Alecian Evelyne


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.4563911", 
  "title": "Probing the magnetospheric accretion region of the young system DoAr 44 using VLTI/GRAVITY", 
  "issued": {
    "date-parts": [
      [
        2021, 
        2, 
        26
      ]
    ]
  }, 
  "abstract": "<p>Young stars accrete material from their circumstellar disk through magnetically-controlled funnel flows. This so-called magnetospheric accretion process is central to the properties of young systems and not yet fully deciphered. We report here on an attempt to directly probe the star-disk interaction region a scale of less than 0.1 au in the young system DoAr 44, using with VLTI/GRAVITY in the K-band. We computed interferometric visibilities and phases in the continuum and in the Br$\\gamma$ line in order to constrain the extent and geometry of the emitting regions. We resolve the continuum emission of the inner dusty disk and measure a half-flux radius of 0.14 au. We show that Br$\\gamma$ emission arises from an even more compact region than the inner disk, with an upper limit of 0.047 au (&sim;5 R$_\\star$). Differential phase measurements between the Br$\\gamma$ line and the continuum allow us to measure the astrometric displacement of the Br$\\gamma$ line-emitting region relative to the continuum on a scale of a few tens of microarcsec, corresponding to a fraction of the stellar radius. Our results can be accounted for by a simple geometric model where the Br$\\gamma$ line emission arises from a compact region interior to the inner disk edge, on a scale of a few stellar radii, fully consistent with the concept of magnetospheric accretion process in low-mass young stellar systems.</p>", 
  "author": [
    {
      "family": "Bouvier Jerome"
    }, 
    {
      "family": "Perraut Karine"
    }, 
    {
      "family": "Alecian Evelyne"
    }
  ], 
  "id": "4563911", 
  "event-place": "virtually anywhere", 
  "type": "graphic", 
  "event": "The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5)"
}
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