Ultra-deep 31.0–50.3 GHz spectral survey of IRC+10216
| Autor: | M. Gómez-Garrido, F. Tercero, Juan R. Pardo, P. de Vicente, Marcelino Agúndez, Celina Bermúdez, J. A. López-Pérez, José Cernicharo, Belén Tercero, Carlos Cabezas, Juan Daniel Gallego |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), European Commission |
| Rok vydání: | 2022 |
| Předmět: |
Line: identification
media_common.quotation_subject FOS: Physical sciences Context (language use) Astrophysics Surveys law.invention Radio lines: stars Telescope law Asymptotic giant branch Isotopologue identification [Line] Stars: individual: IRC+10216 Solar and Stellar Astrophysics (astro-ph.SR) Line (formation) media_common Envelope (waves) Physics stars [Radio lines] Stars: AGB and post-AGB individual: IRC+10216 [Stars] Astronomy and Astrophysics AGB and post-AGB [Stars] Circumstellar envelope Astrophysics - Astrophysics of Galaxies Stars: carbon Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) carbon [Stars] |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/202142263 |
| Popis: | 51 pags., 43 figs., 3 tabs. Context. The carbon-rich envelope of the asymptotic giant branch star CW Leo, IRC+10216, is one of the richest molecular sources in the sky. Available spectral surveys below 51 GHz are more than 25 years old, and new work is needed. Aims. Characterizing the rich molecular content of this source, specially for heavy species, requires carrying out very sensitive spectral surveys at low frequencies. In particular, we have achieved an rms in the range 0.2-0.6mK per MHz. Methods. Long Q band (31.0-50.3 GHz) single-dish integrations were carried out with the Yebes-40m telescope using specifically built receivers. The most recent line catalogs were used to identify the lines. Results. The data contain 652 spectral features, corresponding to 713 transitions from 81 species (we count the isomers, isotopologs, and ortho/para species separately). Only 57 unidentified lines remain with signal-to-noise ratios ≤3. Some new species and/or vibrational modes have been discovered for the first time with this survey. Conclusions. This IRC+10216 spectral survey is by far the most sensitive survey carried out to date in the Q band. It therefore provides the most complete view of IRC+10216 from 31.0 to 50.3 GHz, giving unique information about its molecular content, especially for heavy species. Rotational diagrams built from the data provide valuable information about the physical conditions and chemical content of this circumstellar envelope. We thank Ministerio de Ciencia e Innovación of Spain for funding support through projects PID2019-106110GB-I00, PID2019- 107115GB-C21/AEI/10.13039/501100011033, PID2019-106235GB-I00, and grant FJCI-2016-27983 for CB. We also thank ERC for funding through grant ERC-2013-Syg-610256-NANOCOSMOS. M.A. thanks MICIU for grant RyC2014-16277. |
| Databáze: | OpenAIRE |
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