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ALMA observations o...
ALMA observations of TiO2 around VY Canis Majoris
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- De Beck, Elvire, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Vlemmings, Wouter, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- O Gorman, Eamon, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Richards, A. M. S. (author)
- University of Manchester
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- Baudry, A. (author)
- Centre national de la recherche scientifique (CNRS),Laboratoire d'Astrophysique de Bordeaux
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- Maercker, Matthias, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Decin, L. (author)
- Universiteit Van Amsterdam,University of Amsterdam,Katholieke Universiteit Leuven
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- Humphreys, E. M. (author)
- European Southern Observatory (ESO)
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(creator_code:org_t)
- 2015-07-23
- 2015
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 580
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Abstract
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- Context. Titanium dioxide, TiO2, is a refractory species that could play a crucial role in the dust-condensation sequence around oxygen-rich evolved stars. To date, gas phase TiO2 has been detected only in the complex environment of the red supergiant VY CMa. Aims. We aim to constrain the distribution and excitation of TiO2 around VY CMa in order to clarify its role in dust formation. Methods. We analyse spectra and channel maps for TiO2 extracted from ALMA science verification data. Results. We detect 15 transitions of TiO2, and spatially resolve the emission for the first time. The maps demonstrate a highly clumpy, anisotropic outflow in which the TiO2 emission likely traces gas exposed to the stellar radiation field. An accelerating bipolar-like structure is found, oriented roughly east-west, of which the blue component runs into and breaks up around a solid continuum component. A distinct tail to the south-west is seen for some transitions, consistent with features seen in the optical and near-infrared. Conclusions. 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Stars: mass-loss
- Submillimeter: stars
- Supergiants
- Circumstellar matter
- Stars: individual: VY Canis Majoris
Publication and Content Type
- art (subject category)
- ref (subject category)
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De Beck, Elvire, ...
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Vlemmings, Woute ...
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Muller, Sebastie ...
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Black, John H, 1 ...
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O Gorman, Eamon, ...
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Richards, A. M. ...
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Baudry, A.
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Maercker, Matthi ...
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Decin, L.
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Humphreys, E. M.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Chalmers University of Technology