Hints of a rotating spiral structure in the innermost regions around IRC +10216.
Identifieur interne : 000053 ( PubMed/Corpus ); précédent : 000052; suivant : 000054Hints of a rotating spiral structure in the innermost regions around IRC +10216.
Auteurs : G. Quintana-Lacaci ; J. Cernicharo ; M. Agúndez ; L Velilla Prieto ; A. Castro-Carrizo ; N. Marcelino ; C. Cabezas ; I. Pe A ; J L Alonso ; J. Zú Iga ; A. Requena ; A. Bastida ; Y. Kalugina ; F. Lique ; M. GuélinSource :
- The Astrophysical journal [ 0004-637X ] ; 2016.
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(-4)M☉. 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.
DOI: 10.3847/0004-637X/818/2/192
PubMed: 26997665
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Requena</name><affiliation><nlm:affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A" last="Bastida">A. Bastida</name><affiliation><nlm:affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Kalugina, Y" sort="Kalugina, Y" uniqKey="Kalugina Y" first="Y" last="Kalugina">Y. Kalugina</name><affiliation><nlm:affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France ; Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk 634050, Russia.</nlm:affiliation></affiliation></author><author><name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F" last="Lique">F. Lique</name><affiliation><nlm:affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France.</nlm:affiliation></affiliation></author><author><name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M" last="Guélin">M. Guélin</name><affiliation><nlm:affiliation>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d'Hères, France ; LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France.</nlm:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2016">2016</date><idno type="RBID">pubmed:26997665</idno><idno type="pmid">26997665</idno><idno type="doi">10.3847/0004-637X/818/2/192</idno><idno type="wicri:Area/PubMed/Corpus">000053</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Hints of a rotating spiral structure in the innermost regions around IRC +10216.</title><author><name sortKey="Quintana Lacaci, G" sort="Quintana Lacaci, G" uniqKey="Quintana Lacaci G" first="G" last="Quintana-Lacaci">G. Quintana-Lacaci</name><affiliation><nlm:affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Cernicharo, J" sort="Cernicharo, J" uniqKey="Cernicharo J" first="J" last="Cernicharo">J. Cernicharo</name><affiliation><nlm:affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Agundez, M" sort="Agundez, M" uniqKey="Agundez M" first="M" last="Agúndez">M. Agúndez</name><affiliation><nlm:affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Prieto, L Velilla" sort="Prieto, L Velilla" uniqKey="Prieto L" first="L Velilla" last="Prieto">L Velilla Prieto</name><affiliation><nlm:affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain ; Centro de Astrobiología, INTA-CSIC. E-28691 Villanueva de la Cañada, Madrid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Castro Carrizo, A" sort="Castro Carrizo, A" uniqKey="Castro Carrizo A" first="A" last="Castro-Carrizo">A. Castro-Carrizo</name><affiliation><nlm:affiliation>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d'Hères, France.</nlm:affiliation></affiliation></author><author><name sortKey="Marcelino, N" sort="Marcelino, N" uniqKey="Marcelino N" first="N" last="Marcelino">N. Marcelino</name><affiliation><nlm:affiliation>INAF, Istituto di Radioastronomia, via P. Gobetti 101, 40129, Bologna, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Cabezas, C" sort="Cabezas, C" uniqKey="Cabezas C" first="C" last="Cabezas">C. Cabezas</name><affiliation><nlm:affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Pe A, I" sort="Pe A, I" uniqKey="Pe A I" first="I" last="Pe A">I. Pe A</name><affiliation><nlm:affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Alonso, J L" sort="Alonso, J L" uniqKey="Alonso J" first="J L" last="Alonso">J L Alonso</name><affiliation><nlm:affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Zu Iga, J" sort="Zu Iga, J" uniqKey="Zu Iga J" first="J" last="Zú Iga">J. Zú Iga</name><affiliation><nlm:affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Requena, A" sort="Requena, A" uniqKey="Requena A" first="A" last="Requena">A. Requena</name><affiliation><nlm:affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A" last="Bastida">A. Bastida</name><affiliation><nlm:affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</nlm:affiliation></affiliation></author><author><name sortKey="Kalugina, Y" sort="Kalugina, Y" uniqKey="Kalugina Y" first="Y" last="Kalugina">Y. Kalugina</name><affiliation><nlm:affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France ; Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk 634050, Russia.</nlm:affiliation></affiliation></author><author><name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F" last="Lique">F. Lique</name><affiliation><nlm:affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France.</nlm:affiliation></affiliation></author><author><name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M" last="Guélin">M. Guélin</name><affiliation><nlm:affiliation>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d'Hères, France ; LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France.</nlm:affiliation></affiliation></author></analytic><series><title level="j">The Astrophysical journal</title><idno type="ISSN">0004-637X</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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(-4)M☉. 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.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">26997665</PMID><DateCreated><Year>2016</Year><Month>3</Month><Day>21</Day></DateCreated><DateRevised><Year>2016</Year><Month>11</Month><Day>7</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0004-637X</ISSN><JournalIssue CitedMedium="Print"><Volume>818</Volume><Issue>2</Issue><PubDate><Year>2016</Year><Month>Feb</Month><Day>20</Day></PubDate></JournalIssue><Title>The Astrophysical journal</Title><ISOAbbreviation>Astrophys. J.</ISOAbbreviation></Journal><ArticleTitle>Hints of a rotating spiral structure in the innermost regions around IRC +10216.</ArticleTitle><ELocationID EIdType="pii" ValidYN="Y">192</ELocationID><Abstract><AbstractText NlmCategory="UNASSIGNED">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(-4)M☉. 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.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Quintana-Lacaci</LastName><ForeName>G</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Cernicharo</LastName><ForeName>J</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Agúndez</LastName><ForeName>M</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Prieto</LastName><ForeName>L Velilla</ForeName><Initials>LV</Initials><AffiliationInfo><Affiliation>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain ; Centro de Astrobiología, INTA-CSIC. E-28691 Villanueva de la Cañada, Madrid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Castro-Carrizo</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d'Hères, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Marcelino</LastName><ForeName>N</ForeName><Initials>N</Initials><AffiliationInfo><Affiliation>INAF, Istituto di Radioastronomia, via P. Gobetti 101, 40129, Bologna, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Cabezas</LastName><ForeName>C</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Peña</LastName><ForeName>I</ForeName><Initials>I</Initials><AffiliationInfo><Affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Alonso</LastName><ForeName>J L</ForeName><Initials>JL</Initials><AffiliationInfo><Affiliation>Grupo de Espectroscopía Molecular, Edificio Quifima, Laboratorios de Espectroscopía y Bioe-spectroscopía. Unidad asociada CSIC, Parque científico Uva, Universidad de Valladolid, Paseo de Belén 5, E-47011, Valladolid, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zúñiga</LastName><ForeName>J</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Requena</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Bastida</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Universidad de Murcia. Faculdad de Química. Dpto. de Química-Física. Campus Espinardo E-30100, Murcia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kalugina</LastName><ForeName>Y</ForeName><Initials>Y</Initials><AffiliationInfo><Affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France ; Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk 634050, Russia.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lique</LastName><ForeName>F</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Guélin</LastName><ForeName>M</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d'Hères, France ; LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France.</Affiliation></AffiliationInfo></Author></AuthorList><Language>ENG</Language><GrantList CompleteYN="Y"><Grant><GrantID>ERC_610256</GrantID><Agency>European Research Council</Agency><Country>International</Country></Grant></GrantList><PublicationTypeList><PublicationType UI="">JOURNAL ARTICLE</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Astrophys J</MedlineTA><NlmUniqueID>9890633</NlmUniqueID><ISSNLinking>0004-637X</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">astrochemistry</Keyword><Keyword MajorTopicYN="N">circumstellar matter</Keyword><Keyword MajorTopicYN="N">stars: AGB and post-AGB</Keyword><Keyword MajorTopicYN="N">stars: individual (IRC +10216)</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2016</Year><Month>3</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2016</Year><Month>3</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2016</Year><Month>3</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26997665</ArticleId><ArticleId IdType="doi">10.3847/0004-637X/818/2/192</ArticleId><ArticleId IdType="pmc">PMC4797422</ArticleId><ArticleId IdType="mid">EMS67516</ArticleId></ArticleIdList><pmc-dir>nihms</pmc-dir>
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