DE BECK, Elvire; VLEMMINGS, Wouter; MULLER, Sébastien; BLACK, John H.; O'GORMAN, Eamon; RICHARDS, Anita M. S.; BAUDRY, Alain; MAERCKER, Matthias; DECIN, Leen; HUMPHREYS, Elizabeth M.

doi:10.1088/1742-6596/728/2/022009

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DE BECK, Elvire

VLEMMINGS, Wouter

MULLER, Sébastien
Objets communicants pour l'Internet du futur [OCIF]
Département Réseaux, Sécurité et Multimédia [RSM]
Security, Reliability and Trust Interdisciplibary Research Centre [S'nT]

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Journal of Physics: Conference Series. 2016-07-01, vol. 728, n° 2, p. id. 022009

IOP Science

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Titanium dioxide, TiO2, is a refractory species that could play a crucial role in the dust-condensation sequence around oxygen-rich evolved stars. We present and discuss the detections of 15 emission lines of TiO2 with ALMA in the complex environment of the red supergiant VY CMa. The observations reveal a highly clumpy, anisotropic outflow in which the TiO2 emission likely traces gas exposed to the stellar radiation field. We find evidence for a roughly east-west oriented, accelerating bipolar-like structure, of which the blue component runs into and breaks up around a solid continuum component. We see a distinct tail to the south-west for some transitions, consistent with features seen in the optical and near-infrared. We find that a significant fraction of TiO2 remains in the gas phase outside the dust-formation zone and suggest that this species might play only a minor role in the dust-condensation process around extreme oxygen-rich evolved stars like VY CMa.< Réduire

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ALMA observations of TiO 2 around VY CMa

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