ALMA observations of TiO$_2$ around VY Canis Majoris
| dc.contributor.author | DE BECK, E., | |
| dc.contributor.author | VLEMMINGS, W., | |
| hal.structure.identifier | Laboratoire Interdisciplinaire des Environnements Continentaux [LIEC] | |
| dc.contributor.author | MULLER, S., | |
| dc.contributor.author | BLACK, J. H., | |
| hal.structure.identifier | Department of Biology | |
| dc.contributor.author | O'GORMAN, E., | |
| dc.contributor.author | RICHARDS, A. M. S., | |
| hal.structure.identifier | FORMATION STELLAIRE 2015 | |
| dc.contributor.author | BAUDRY, Alain | |
| dc.contributor.author | MAERCKER, M., | |
| dc.contributor.author | DECIN, L., | |
| dc.contributor.author | HUMPHREYS, E. M., | |
| dc.date.issued | 2015-06 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Titanium dioxide, TiO$_2$, is a refractory species that could play a crucial role in the dust-condensation sequence around oxygen-rich evolved stars. To date, gas phase TiO$_2$ has been detected only in the complex environment of the red supergiant VY CMa. We aim to constrain the distribution and excitation of TiO$_2$ around VY CMa in order to clarify its role in dust formation. We analyse spectra and channel maps for TiO$_2$ extracted from ALMA science verification data. We detect 15 transitions of TiO$_2$, and spatially resolve the emission for the first time. The maps demonstrate a highly clumpy, anisotropic outflow in which the TiO$_2$ emission likely traces gas exposed to the stellar radiation field. A roughly east-west oriented, accelerating bipolar-like structure is found, 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. We find that a significant fraction of TiO$_2$ 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. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.title.en | ALMA observations of TiO$_2$ around VY Canis Majoris | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201525990 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA] | |
| dc.identifier.arxiv | 1506.00818 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A36 | |
| bordeaux.volume | 580 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01159884 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01159884v1 | |
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