Detection of CH+ emission from the disc around HD 100546
| Autor: | P. Woitke, C. Martin-Zaidi, Francois Menard, Inga Kamp, Myriam Benisty, Wing-Fai Thi, E. Tatulli, G. Sandell, G. J. White, Carlos Eiroa, Christophe Pinte, Gwendolyn Meeus, Sean D. Brittain, Christian D. Howard, I. Pascucci, C. A. Grady |
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| Přispěvatelé: | Astronomy, UAM. Departamento de Física Teórica |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Protoplanetary disks
ROTATIONAL-EXCITATION Be star FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 1ST DETECTION 01 natural sciences Spitzer Space Telescope RADIATIVE-TRANSFER CIRCUMSTELLAR DISKS 0103 physical sciences DM TAU Emission spectrum INNER 010306 general physics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Astrochemistry Physics INTERSTELLAR-MEDIUM astrochemistry protoplanetary disks Física Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies On board 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) HERBIG-AE/BE STARS Astrophysics::Earth and Planetary Astrophysics ORGANIC-MOLECULES |
| Zdroj: | Astronomy & astrophysics, 530:L2. EDP Sciences Biblos-e Archivo. Repositorio Institucional de la UAM instname |
| ISSN: | 0004-6361 |
| Popis: | Astronomy and Astrophysics 530 (2011): L2 Reproduced with permission from Astronomy & Astrophysics Despite its importance in the thermal balance of the gas and in the determination of primeval planetary atmospheres, the chemistry in protoplanetary discs remains poorly constrained with only a handful of detected species. We observed the emission from the disc around the Herbig Be star HD 100546 with the PACS instrument in the spectroscopic mode on board the Herschel Space Telescope as part of the GAS in Protoplanetary Systems (GASPS) programme and used archival data from the DIGIT programme to search for the rotational emission of CH+. We detected in both datasets an emission line centred at 72.16 μm that most likely corresponds to the J = 5−4 rotational emission of CH+. The J = 3−2 and 6−5 transitions are also detected albeit with lower confidence. Other CH+ rotational lines in the PACS observations are blended with water lines. A rotational diagram analysis shows that the CH+ gas is warm at 323+2320 −151 K with a mass of ∼3×10−14−5×10−12 M_.We modelled the CH+ chemistry with the chemo-physical code ProDiMo using a disc density structure and grain parameters that match continuum observations and near- and mid-infrared interferometric data. The model suggests that CH+ is most abundant at the location of the disc rim at 10−13 AU from the star where the gas is warm, which is consistent with previous observations of hot CO gas emission This work is partly supported by the Spanish grant AYA 2008-01727. Also is funding from the EC 7th Framework Programme (PIEF-GA-2008-220891, PERG06- GA-2009-256513) |
| Databáze: | OpenAIRE |
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