LeHavreV1, France, Analysis, bibRecord, 000054

Hints of a rotating spiral structure in the innermost regions around IRC +10216

Identifieur interne : 000054 ( France/Analysis ); précédent : 000053; suivant : 000055

Hints of a rotating spiral structure in the innermost regions around IRC +10216

Auteurs : G. Quintana-Lacaci [Espagne] ; J. Cernicharo [Espagne] ; M. Agúndez [Espagne] ; L. Velilla Prieto [Espagne] ; A. Castro-Carrizo [France] ; N. Marcelino [Italie] ; C. Cabezas [Espagne] ; I. Pe A [Espagne] ; J. L. Alonso [Espagne] ; J. Zú Iga [Espagne] ; A. Requena [Espagne] ; A. Bastida [Espagne] ; Y. Kalugina [France, Russie] ; F. Lique [France] ; M. Guélin [France]

Source :

The Astrophysical journal [ 0004-637X ] ; 2016.

RBID : PMC:4797422

Abstract

The Atacama Large Millimeter/submillimeter Array (ALMA) is allowing us to study the innermost regions of the circumstellar envelopes of evolved stars with un-precedented precision and sensitivity. Key processes in the ejection of matter and dust from these objects occur in their inner zones. In this work, we present sub-arcsecond interferometric maps of transitions of metal-bearing molecules towards the prototypical C-rich evolved star IRC +10216. While Al-bearing molecules seem to be present as a roughly spherical shell, the molecular emission from the salts NaCl and KCl presents an elongation in the inner regions, with a central minimum. In order to accurately analyze the emission from the NaCl rotational lines, we present new calculations of the collisional rates for this molecule based on new spectroscopic constants. The most plausible interpretation for the spatial distribution of the salts is a spiral with a NaCl mass of 0.08M_☉. Alternatively, a torus of gas and dust would result in similar structures as those observed. From the torus scenario we derive a mass of ~ 1.1 × 10⁻⁴M_☉. In both cases, the spiral and the torus, the NaCl structure presents an inner minimum of 27 AU. In the case of the torus, the outer radius is 73 AU. The kinematics of both the spiral and the torus suggests that they are slowly expanding and rotating. Alternative explanations for the presence of the elongation are explored. The presence of these features only in KCl and NaCl might be a result of their comparatively high dipole moment with respect to the Al-bearing species.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4797422

DOI: 10.3847/0004-637X/818/2/192
PubMed: 26997665
PubMed Central: 4797422

Affiliations:

Links to Exploration step

PMC:4797422

Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Hints of a rotating spiral structure in the innermost regions around IRC +10216</title>
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<author><name sortKey="Zu Iga, J" sort="Zu Iga, J" uniqKey="Zu Iga J" first="J." last="Zú Iga">J. Zú Iga</name>
<affiliation wicri:level="1"><nlm:aff id="A6">Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain</nlm:aff>
<country xml:lang="fr">Espagne</country>
<wicri:regionArea>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia</wicri:regionArea>
<wicri:noRegion>Murcia</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Requena, A" sort="Requena, A" uniqKey="Requena A" first="A." last="Requena">A. Requena</name>
<affiliation wicri:level="1"><nlm:aff id="A6">Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain</nlm:aff>
<country xml:lang="fr">Espagne</country>
<wicri:regionArea>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia</wicri:regionArea>
<wicri:noRegion>Murcia</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A." last="Bastida">A. Bastida</name>
<affiliation wicri:level="1"><nlm:aff id="A6">Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain</nlm:aff>
<country xml:lang="fr">Espagne</country>
<wicri:regionArea>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia</wicri:regionArea>
<wicri:noRegion>Murcia</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Kalugina, Y" sort="Kalugina, Y" uniqKey="Kalugina Y" first="Y." last="Kalugina">Y. Kalugina</name>
<affiliation wicri:level="4"><nlm:aff id="A7">LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France</nlm:aff>
<country xml:lang="fr">France</country>
<wicri:regionArea>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex</wicri:regionArea>
<placeName><region type="region" nuts="2">Région Normandie</region>
<region type="old region" nuts="2">Haute-Normandie</region>
<settlement type="city">Le Havre</settlement>
</placeName>
<orgName type="university">Université du Havre</orgName>
</affiliation>
<affiliation wicri:level="1"><nlm:aff id="A8">Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk 634050, Russia</nlm:aff>
<country xml:lang="fr">Russie</country>
<wicri:regionArea>Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk 634050</wicri:regionArea>
<wicri:noRegion>Tomsk 634050</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F." last="Lique">F. Lique</name>
<affiliation wicri:level="4"><nlm:aff id="A7">LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France</nlm:aff>
<country xml:lang="fr">France</country>
<wicri:regionArea>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex</wicri:regionArea>
<placeName><region type="region" nuts="2">Région Normandie</region>
<region type="old region" nuts="2">Haute-Normandie</region>
<settlement type="city">Le Havre</settlement>
</placeName>
<orgName type="university">Université du Havre</orgName>
</affiliation>
</author>
<author><name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M." last="Guélin">M. Guélin</name>
<affiliation wicri:level="3"><nlm:aff id="A3">Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</nlm:aff>
<country xml:lang="fr">France</country>
<wicri:regionArea>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères</wicri:regionArea>
<placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region>
<region type="old region" nuts="2">Rhône-Alpes</region>
<settlement type="city">Saint Martin d’Hères</settlement>
</placeName>
</affiliation>
<affiliation wicri:level="3"><nlm:aff id="A9">LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France</nlm:aff>
<country xml:lang="fr">France</country>
<wicri:regionArea>LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris</wicri:regionArea>
<placeName><region type="region" nuts="2">Île-de-France</region>
<settlement type="city">Paris</settlement>
</placeName>
</affiliation>
</author>
</analytic>
<series><title level="j">The Astrophysical journal</title>
<idno type="ISSN">0004-637X</idno>
<imprint><date when="2016">2016</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><p id="P1">The Atacama Large Millimeter/submillimeter Array (ALMA) is allowing us to study the innermost regions of the circumstellar envelopes of evolved stars with <bold>un-precedented</bold>
 precision and sensitivity. Key processes in the ejection of matter and dust from these objects occur in their inner zones. In this work, we present sub-arcsecond interferometric maps of transitions of metal-bearing molecules towards the prototypical C-rich evolved star IRC +10216. While Al-bearing molecules seem to be present as a roughly spherical shell, the molecular emission from the salts NaCl and KCl presents an elongation in the inner regions, with a central minimum. In order to accurately analyze the emission <bold>from</bold>
 the NaCl rotational lines, we present new calculations of the collisional rates for this molecule based on new spectroscopic constants. The most plausible interpretation for the spatial distribution of the salts is a spiral with a NaCl mass of 0.08<italic>M</italic>
<sub>☉</sub>
. Alternatively, a torus of gas and dust would result in similar structures as those observed. <bold>From the torus scenario we derive a mass of</bold>
 ~ 1.1 × 10<sup>−4</sup>
<italic>M</italic>
<sub>☉</sub>
<bold>.</bold>
 In both cases, the spiral and the torus, the NaCl structure presents an inner minimum of 27 AU. In the case of the torus, the outer radius is 73 AU. The kinematics of both the spiral and the torus suggests that they are slowly expanding and rotating. Alternative explanations for the presence of the elongation are explored. The presence of <bold>these features</bold>
 only in KCl and NaCl might be a result of their comparatively high dipole moment with respect to the Al-bearing species.</p>
</div>
</front>
</TEI>
<affiliations><list><country><li>Espagne</li>
<li>France</li>
<li>Italie</li>
<li>Russie</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Communauté de Madrid</li>
<li>Haute-Normandie</li>
<li>Rhône-Alpes</li>
<li>Région Normandie</li>
<li>Île-de-France</li>
</region>
<settlement><li>Le Havre</li>
<li>Madrid</li>
<li>Paris</li>
<li>Saint Martin d’Hères</li>
</settlement>
<orgName><li>Université du Havre</li>
</orgName>
</list>
<tree><country name="Espagne"><region name="Communauté de Madrid"><name sortKey="Quintana Lacaci, G" sort="Quintana Lacaci, G" uniqKey="Quintana Lacaci G" first="G." last="Quintana-Lacaci">G. Quintana-Lacaci</name>
</region>
<name sortKey="Agundez, M" sort="Agundez, M" uniqKey="Agundez M" first="M." last="Agúndez">M. Agúndez</name>
<name sortKey="Alonso, J L" sort="Alonso, J L" uniqKey="Alonso J" first="J. L." last="Alonso">J. L. Alonso</name>
<name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A." last="Bastida">A. Bastida</name>
<name sortKey="Cabezas, C" sort="Cabezas, C" uniqKey="Cabezas C" first="C." last="Cabezas">C. Cabezas</name>
<name sortKey="Cernicharo, J" sort="Cernicharo, J" uniqKey="Cernicharo J" first="J." last="Cernicharo">J. Cernicharo</name>
<name sortKey="Pe A, I" sort="Pe A, I" uniqKey="Pe A I" first="I." last="Pe A">I. Pe A</name>
<name sortKey="Prieto, L Velilla" sort="Prieto, L Velilla" uniqKey="Prieto L" first="L. Velilla" last="Prieto">L. Velilla Prieto</name>
<name sortKey="Prieto, L Velilla" sort="Prieto, L Velilla" uniqKey="Prieto L" first="L. Velilla" last="Prieto">L. Velilla Prieto</name>
<name sortKey="Requena, A" sort="Requena, A" uniqKey="Requena A" first="A." last="Requena">A. Requena</name>
<name sortKey="Zu Iga, J" sort="Zu Iga, J" uniqKey="Zu Iga J" first="J." last="Zú Iga">J. Zú Iga</name>
</country>
<country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Castro Carrizo, A" sort="Castro Carrizo, A" uniqKey="Castro Carrizo A" first="A." last="Castro-Carrizo">A. Castro-Carrizo</name>
</region>
<name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M." last="Guélin">M. Guélin</name>
<name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M." last="Guélin">M. Guélin</name>
<name sortKey="Kalugina, Y" sort="Kalugina, Y" uniqKey="Kalugina Y" first="Y." last="Kalugina">Y. Kalugina</name>
<name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F." last="Lique">F. Lique</name>
</country>
<country name="Italie"><noRegion><name sortKey="Marcelino, N" sort="Marcelino, N" uniqKey="Marcelino N" first="N." last="Marcelino">N. Marcelino</name>
</noRegion>
</country>
<country name="Russie"><noRegion><name sortKey="Kalugina, Y" sort="Kalugina, Y" uniqKey="Kalugina Y" first="Y." last="Kalugina">Y. Kalugina</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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Hints of a rotating spiral structure in the innermost regions around IRC +10216

Hints of a rotating spiral structure in the innermost regions around IRC +10216

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