SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO
Identifieur interne : 000198 ( Pmc/Corpus ); précédent : 000197; suivant : 000199SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO
Auteurs : L. Velilla Prieto ; J. Cernicharo ; G. Quintana Acaci ; M. Agúndez ; A. Castro Arrizo ; 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.
Url:
DOI: 10.1088/2041-8205/805/2/L13
PubMed: 26688711
PubMed Central: 4681092
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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:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Centro de Astrobiología, INTA–CSIC. E-28691 Villanueva de la Cañada, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Cernicharo, J" sort="Cernicharo, J" uniqKey="Cernicharo J" first="J." last="Cernicharo">J. Cernicharo</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Quintana Acaci, G" sort="Quintana Acaci, G" uniqKey="Quintana Acaci G" first="G." last="Quintana Acaci">G. Quintana Acaci</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Agundez, M" sort="Agundez, M" uniqKey="Agundez M" first="M." last="Agúndez">M. Agúndez</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Castro Arrizo, A" sort="Castro Arrizo, A" uniqKey="Castro Arrizo A" first="A." last="Castro Arrizo">A. Castro Arrizo</name><affiliation><nlm:aff id="A3">Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</nlm:aff></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:aff id="A4">Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México</nlm:aff></affiliation></author><author><name sortKey="Marcelino, N" sort="Marcelino, N" uniqKey="Marcelino N" first="N." last="Marcelino">N. Marcelino</name><affiliation><nlm:aff id="A5">Istituto di Radiastronomia, INAF–CNR, via Gobetti 101, 40129 Bologna, Italy</nlm:aff></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:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Requena, A" sort="Requena, A" uniqKey="Requena A" first="A." last="Requena">A. Requena</name><affiliation><nlm:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A." last="Bastida">A. Bastida</name><affiliation><nlm:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F." last="Lique">F. Lique</name><affiliation><nlm:aff id="A7">LOMC–UMR 6294, CNRS–Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France</nlm:aff></affiliation></author><author><name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M." last="Guélin">M. Guélin</name><affiliation><nlm:aff id="A3">Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</nlm:aff></affiliation><affiliation><nlm:aff id="A8">LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26688711</idno><idno type="pmc">4681092</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4681092</idno><idno type="RBID">PMC:4681092</idno><idno type="doi">10.1088/2041-8205/805/2/L13</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000198</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">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:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Centro de Astrobiología, INTA–CSIC. E-28691 Villanueva de la Cañada, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Cernicharo, J" sort="Cernicharo, J" uniqKey="Cernicharo J" first="J." last="Cernicharo">J. Cernicharo</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Quintana Acaci, G" sort="Quintana Acaci, G" uniqKey="Quintana Acaci G" first="G." last="Quintana Acaci">G. Quintana Acaci</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Agundez, M" sort="Agundez, M" uniqKey="Agundez M" first="M." last="Agúndez">M. Agúndez</name><affiliation><nlm:aff id="A1">Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</nlm:aff></affiliation></author><author><name sortKey="Castro Arrizo, A" sort="Castro Arrizo, A" uniqKey="Castro Arrizo A" first="A." last="Castro Arrizo">A. Castro Arrizo</name><affiliation><nlm:aff id="A3">Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</nlm:aff></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:aff id="A4">Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México</nlm:aff></affiliation></author><author><name sortKey="Marcelino, N" sort="Marcelino, N" uniqKey="Marcelino N" first="N." last="Marcelino">N. Marcelino</name><affiliation><nlm:aff id="A5">Istituto di Radiastronomia, INAF–CNR, via Gobetti 101, 40129 Bologna, Italy</nlm:aff></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:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Requena, A" sort="Requena, A" uniqKey="Requena A" first="A." last="Requena">A. Requena</name><affiliation><nlm:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Bastida, A" sort="Bastida, A" uniqKey="Bastida A" first="A." last="Bastida">A. Bastida</name><affiliation><nlm:aff id="A6">Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</nlm:aff></affiliation></author><author><name sortKey="Lique, F" sort="Lique, F" uniqKey="Lique F" first="F." last="Lique">F. Lique</name><affiliation><nlm:aff id="A7">LOMC–UMR 6294, CNRS–Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France</nlm:aff></affiliation></author><author><name sortKey="Guelin, M" sort="Guelin, M" uniqKey="Guelin M" first="M." last="Guélin">M. Guélin</name><affiliation><nlm:aff id="A3">Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</nlm:aff></affiliation><affiliation><nlm:aff id="A8">LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France</nlm:aff></affiliation></author></analytic><series><title level="j">The astrophysical journal. Letters</title><idno type="ISSN">2041-8205</idno><idno type="eISSN">2041-8213</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p id="P1">We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC<sub>2</sub> 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 SiC<sub>2</sub>, and also proves the existence of an increase in the SiC<sub>2</sub> 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.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<pmc-dir>properties manuscript</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-journal-id">101671660</journal-id><journal-id journal-id-type="pubmed-jr-id">44598</journal-id><journal-id journal-id-type="nlm-ta">Astrophys J Lett</journal-id><journal-id journal-id-type="iso-abbrev">Astrophys J Lett</journal-id><journal-title-group><journal-title>The astrophysical journal. Letters</journal-title></journal-title-group><issn pub-type="ppub">2041-8205</issn><issn pub-type="epub">2041-8213</issn></journal-meta><article-meta><article-id pub-id-type="pmid">26688711</article-id><article-id pub-id-type="pmc">4681092</article-id><article-id pub-id-type="doi">10.1088/2041-8205/805/2/L13</article-id><article-id pub-id-type="manuscript">EMS65789</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>SI-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLEO</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Prieto</surname><given-names>L. Velilla</given-names></name><xref ref-type="aff" rid="A1">1</xref><xref ref-type="aff" rid="A2">2</xref></contrib><contrib contrib-type="author"><name><surname>Cernicharo</surname><given-names>J.</given-names></name><xref ref-type="aff" rid="A1">1</xref></contrib><contrib contrib-type="author"><name><surname>Quintana–Lacaci</surname><given-names>G.</given-names></name><xref ref-type="aff" rid="A1">1</xref></contrib><contrib contrib-type="author"><name><surname>Agúndez</surname><given-names>M.</given-names></name><xref ref-type="aff" rid="A1">1</xref></contrib><contrib contrib-type="author"><name><surname>Castro–Carrizo</surname><given-names>A.</given-names></name><xref ref-type="aff" rid="A3">3</xref></contrib><contrib contrib-type="author"><name><surname>Fonfŕia</surname><given-names>J. P.</given-names></name><xref ref-type="aff" rid="A4">4</xref></contrib><contrib contrib-type="author"><name><surname>Marcelino</surname><given-names>N.</given-names></name><xref ref-type="aff" rid="A5">5</xref></contrib><contrib contrib-type="author"><name><surname>Zúñiga</surname><given-names>J.</given-names></name><xref ref-type="aff" rid="A6">6</xref></contrib><contrib contrib-type="author"><name><surname>Requena</surname><given-names>A.</given-names></name><xref ref-type="aff" rid="A6">6</xref></contrib><contrib contrib-type="author"><name><surname>Bastida</surname><given-names>A.</given-names></name><xref ref-type="aff" rid="A6">6</xref></contrib><contrib contrib-type="author"><name><surname>Lique</surname><given-names>F.</given-names></name><xref ref-type="aff" rid="A7">7</xref></contrib><contrib contrib-type="author"><name><surname>Guélin</surname><given-names>M.</given-names></name><xref ref-type="aff" rid="A3">3</xref><xref ref-type="aff" rid="A8">8</xref></contrib></contrib-group><aff id="A1"><label>1</label>Group of Molecular Astrophysics. ICMM, CSIC. C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain</aff><aff id="A2"><label>2</label>Centro de Astrobiología, INTA–CSIC. E-28691 Villanueva de la Cañada, Madrid, Spain</aff><aff id="A3"><label>3</label>Institut de Radioastronomie Millimétrique. 300 rue de la la Piscine, F-38406, Saint Martin d’Hères, France</aff><aff id="A4"><label>4</label>Departamento de Estrellas y Medio Interestelar, Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Mexico City, México</aff><aff id="A5"><label>5</label>Istituto di Radiastronomia, INAF–CNR, via Gobetti 101, 40129 Bologna, Italy</aff><aff id="A6"><label>6</label>Departamento de Química Física, Facultad de Química, Universidad de Murcia. Campus Espinardo, 30100 Murcia, Spain</aff><aff id="A7"><label>7</label>LOMC–UMR 6294, CNRS–Université du Havre, 25 rue Philippe Lebon, BP. 1123, 76063 Le Havre cedex, France</aff><aff id="A8"><label>8</label>LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, F-75014, Paris, France</aff><pub-date pub-type="nihms-submitted"><day>19</day><month>11</month><year>2015</year></pub-date><pub-date pub-type="ppub"><day>1</day><month>6</month><year>2015</year></pub-date><pub-date pub-type="pmc-release"><day>16</day><month>12</month><year>2015</year></pub-date><volume>805</volume><issue>2</issue><elocation-id>L13</elocation-id><self-uri xlink:href="http://iopscience.iop.org/article/10.1088/2041-8205/805/2/L13/meta"></self-uri><abstract><p id="P1">We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC<sub>2</sub> 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 SiC<sub>2</sub>, and also proves the existence of an increase in the SiC<sub>2</sub> 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.</p></abstract><kwd-group><kwd>astrochemistry</kwd><kwd>circumstellar matter</kwd><kwd>line: identification</kwd><kwd>molecular processes</kwd><kwd>stars: AGB and post-AGB</kwd><kwd>stars: individual (IRC+10216)</kwd></kwd-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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