SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO.
Identifieur interne : 000086 ( PubMed/Corpus ); précédent : 000085; suivant : 000087SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO.
Auteurs : L Velilla Prieto ; J. Cernicharo ; G. Quintana-Lacaci ; M. Agúndez ; A. Castro-Carrizo ; J P Fonf Ia ; N. Marcelino ; J. Zú Iga ; A. Requena ; A. Bastida ; F. Lique ; M. GuélinSource :
- The astrophysical journal. Letters [ 2041-8205 ] ; 2015.
Abstract
We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC2 lines in their ground vibrational state toward IRC+10216 during the Atacama Large Millimeter Array Cycle 0. The spatial distribution of these molecules shows compact emission for SiS and a more extended emission for SiO and SiC2, and also proves the existence of an increase in the SiC2 emission at the outer shells of the circumstellar envelope. We analyze the excitation conditions of the vibrationally excited SiS using the population diagram technique, and we use a large velocity gradient model to compare with the observations. We found moderate discrepancies between the observations and the models that could be explained if SiS lines detected are optically thick. Additionally, the line profiles of the detected rotational lines in the high energy vibrational states show a decreasing linewidth with increasing energy levels. This may be evidence that these lines could be excited only in the inner shells, i.e., the densest and hottest, of the circumstellar envelope of IRC+10216.
DOI: 10.1088/2041-8205/805/2/L13
PubMed: 26688711
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO.</title><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="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="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="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="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="Fonf Ia, J P" sort="Fonf Ia, J P" uniqKey="Fonf Ia J" first="J P" last="Fonf Ia">J P Fonf Ia</name><affiliation><nlm:affiliation>Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México.</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>Istituto di Radiastronomia, INAF-CNR, via Gobetti 101, 40129 Bologna, Italy.</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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain.</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="2015">2015</date><idno type="RBID">pubmed:26688711</idno><idno type="pmid">26688711</idno><idno type="doi">10.1088/2041-8205/805/2/L13</idno><idno type="wicri:Area/PubMed/Corpus">000086</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO.</title><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="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="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="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="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="Fonf Ia, J P" sort="Fonf Ia, J P" uniqKey="Fonf Ia J" first="J P" last="Fonf Ia">J P Fonf Ia</name><affiliation><nlm:affiliation>Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México.</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>Istituto di Radiastronomia, INAF-CNR, via Gobetti 101, 40129 Bologna, Italy.</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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 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>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain.</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. Letters</title><idno type="ISSN">2041-8205</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC2 lines in their ground vibrational state toward IRC+10216 during the Atacama Large Millimeter Array Cycle 0. The spatial distribution of these molecules shows compact emission for SiS and a more extended emission for SiO and SiC2, and also proves the existence of an increase in the SiC2 emission at the outer shells of the circumstellar envelope. We analyze the excitation conditions of the vibrationally excited SiS using the population diagram technique, and we use a large velocity gradient model to compare with the observations. We found moderate discrepancies between the observations and the models that could be explained if SiS lines detected are optically thick. Additionally, the line profiles of the detected rotational lines in the high energy vibrational states show a decreasing linewidth with increasing energy levels. This may be evidence that these lines could be excited only in the inner shells, i.e., the densest and hottest, of the circumstellar envelope of IRC+10216.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">26688711</PMID><DateCreated><Year>2015</Year><Month>12</Month><Day>21</Day></DateCreated><DateRevised><Year>2016</Year><Month>11</Month><Day>7</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">2041-8205</ISSN><JournalIssue CitedMedium="Print"><Volume>805</Volume><Issue>2</Issue><PubDate><Year>2015</Year><Month>Jun</Month><Day>1</Day></PubDate></JournalIssue><Title>The astrophysical journal. Letters</Title><ISOAbbreviation>Astrophys J Lett</ISOAbbreviation></Journal><ArticleTitle>SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO.</ArticleTitle><ELocationID EIdType="pii" ValidYN="Y">L13</ELocationID><Abstract><AbstractText NlmCategory="UNASSIGNED">We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC2 lines in their ground vibrational state toward IRC+10216 during the Atacama Large Millimeter Array Cycle 0. The spatial distribution of these molecules shows compact emission for SiS and a more extended emission for SiO and SiC2, and also proves the existence of an increase in the SiC2 emission at the outer shells of the circumstellar envelope. We analyze the excitation conditions of the vibrationally excited SiS using the population diagram technique, and we use a large velocity gradient model to compare with the observations. We found moderate discrepancies between the observations and the models that could be explained if SiS lines detected are optically thick. Additionally, the line profiles of the detected rotational lines in the high energy vibrational states show a decreasing linewidth with increasing energy levels. This may be evidence that these lines could be excited only in the inner shells, i.e., the densest and hottest, of the circumstellar envelope of IRC+10216.</AbstractText></Abstract><AuthorList CompleteYN="Y"><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>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>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>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>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>Fonfŕia</LastName><ForeName>J P</ForeName><Initials>JP</Initials><AffiliationInfo><Affiliation>Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Marcelino</LastName><ForeName>N</ForeName><Initials>N</Initials><AffiliationInfo><Affiliation>Istituto di Radiastronomia, INAF-CNR, via Gobetti 101, 40129 Bologna, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zúñiga</LastName><ForeName>J</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Requena</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Bastida</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain.</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>England</Country><MedlineTA>Astrophys J Lett</MedlineTA><NlmUniqueID>101671660</NlmUniqueID><ISSNLinking>2041-8205</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">astrochemistry</Keyword><Keyword MajorTopicYN="N">circumstellar matter</Keyword><Keyword MajorTopicYN="N">line: identification</Keyword><Keyword MajorTopicYN="N">molecular processes</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>2015</Year><Month>12</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>12</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2015</Year><Month>12</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26688711</ArticleId><ArticleId IdType="doi">10.1088/2041-8205/805/2/L13</ArticleId><ArticleId IdType="pmc">PMC4681092</ArticleId><ArticleId IdType="mid">EMS65789</ArticleId></ArticleIdList><pmc-dir>nihms</pmc-dir>
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