Depletion of chlorine into HCl ice in a protostellar core
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | KAMA, M., | |
| hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] | |
| hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] | |
| dc.contributor.author | CAUX, E., | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | LOPEZ-SEPULCRE, A., | |
| hal.structure.identifier | AMOR 2015 | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | WAKELAM, Valentine | |
| hal.structure.identifier | Astronomical Institute Anton Pannekoek [AI PANNEKOEK] | |
| dc.contributor.author | DOMINIK, C., | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | CECCARELLI, C., | |
| hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] | |
| dc.contributor.author | LANZA, M., | |
| hal.structure.identifier | Laboratoire Ondes et Milieux Complexes [LOMC] | |
| dc.contributor.author | LIQUE, F., | |
| dc.contributor.author | OCHSENDORF, B. B., | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | LIS, D. C., | |
| dc.contributor.author | CABALLERO, R. N., | |
| hal.structure.identifier | SRON Netherlands Institute for Space Research [SRON] | |
| dc.contributor.author | TIELENS, A. G. G. M. | |
| dc.date.created | 2014 | |
| dc.date.issued | 2015 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | The freezeout of gas-phase species onto cold dust grains can drastically alter the chemistry and the heating-cooling balance of protostellar material. In contrast to well-known species such as carbon monoxide (CO), the freezeout of various carriers of elements with abundances $<10^{-5}$ has not yet been well studied. Our aim here is to study the depletion of chlorine in the protostellar core, OMC-2 FIR 4. We observed transitions of HCl and H2Cl+ towards OMC-2 FIR 4 using the Herschel Space Observatory and Caltech Submillimeter Observatory facilities. Our analysis makes use of state of the art chlorine gas-grain chemical models and newly calculated HCl-H$_{2}$ hyperfine collisional excitation rate coefficients. A narrow emission component in the HCl lines traces the extended envelope, and a broad one traces a more compact central region. The gas-phase HCl abundance in FIR 4 is 9e-11, a factor of only 0.001 that of volatile elemental chlorine. The H2Cl+ lines are detected in absorption and trace a tenuous foreground cloud, where we find no depletion of volatile chlorine. Gas-phase HCl is the tip of the chlorine iceberg in protostellar cores. Using a gas-grain chemical model, we show that the hydrogenation of atomic chlorine on grain surfaces in the dark cloud stage sequesters at least 90% of the volatile chlorine into HCl ice, where it remains in the protostellar stage. About 10% of chlorine is in gaseous atomic form. Gas-phase HCl is a minor, but diagnostically key reservoir, with an abundance of <1e-10 in most of the protostellar core. We find the 35Cl/37Cl ratio in OMC-2 FIR 4 to be 3.2\pm0.1, consistent with the solar system value. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.title.en | Depletion of chlorine into HCl ice in a protostellar core | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201424737 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1411.6483 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | id.A107 | |
| bordeaux.volume | 574 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01090994 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01090994v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2015&rft.volume=574&rft.spage=id.A107&rft.epage=id.A107&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=KAMA,%20M.,&CAUX,%20E.,&LOPEZ-SEPULCRE,%20A.,&WAKELAM,%20Valentine&DOMINIK,%20C.,&rft.genre=article |
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