Exploring cyanopolyynes towards the C-rich post-AGB star IRAS 22272+5435
ABSTRACT Cyanopolyynes are a class of long carbon-chain molecules that are widely distributed in interstellar clouds, but their presence in the circumstellar envelopes (CSEs) of evolved stars appears to be limited to only a few well-studied sources. This study aims to search for the presence of cyanopolyynes in the CSE of the C-rich post-asymptotic giant branch (post-AGB) star IRAS 22272+5435 through observational analysis and radiative transfer modelling. Observations were conducted using the Tianma 65 m radio telescope (TMRT) at $\sim$15 GHz and the Purple Mountain Observatory (PMO) 13.7 m MM-Wave telescope at $\sim$90 GHz. The HC$_3$N $J = 10\!-\!9$ and HCN $J = 1\!-\!0$ transitions were clearly detected in the PMO 13.7 m data, while no significant signals of other cyanopolyynes were detected with TMRT. Based on the observed HC$_3$N line, we constructed a spherically symmetric non-thermodynamic equilibrium radiative transfer model, extrapolating the abundance distribution structure from the well-studied C-rich AGB star IRC+10216 to IRAS 22272+5435. The model successfully reproduces the observed HC$_3$N and HCN profiles and predicts the line intensities of HC$_5$N and HC$_7$N. Although the results suggest that these heavier cyanopolyynes may be present in the CSE, their detections are hindered by the large distance and significant beam dilution effects. This study provides valuable observational constraints and theoretical insights into the formation and evolution of carbon-chain molecules in post-AGB environments.
Authors
- R. Szczerba (ORCID: https://orcid.org/0000-0003-2886-4460)
- Xiaomin Song (ORCID: https://orcid.org/0000-0002-2586-9285)
- Tao Yang (ORCID: https://orcid.org/0000-0003-4101-2385)
- M. Schmidt (ORCID: https://orcid.org/0000-0003-1172-0946)
- Jixing Ge (ORCID: https://orcid.org/0000-0002-9600-1846)
- Rong Ma
- Jixian Sun (ORCID: https://orcid.org/0000-0002-0878-4343)
- T. J. Millar (ORCID: https://orcid.org/0000-0001-5178-3656)
- Xiaohu Li (ORCID: https://orcid.org/0000-0003-2090-5416)
- G. Fedoseev (ORCID: https://orcid.org/0000-0003-2434-2219)
- Yong Zhang (ORCID: https://orcid.org/0000-0002-1086-7922)
- Zhenzhen Miao
- Wasim Iqbal (ORCID: https://orcid.org/0000-0001-7475-230X)
- Chuan‐Lu Yang (ORCID: https://orcid.org/0000-0001-9138-3075)
- Jianchao Yang
- Fangfang Li (ORCID: https://orcid.org/0000-0001-7695-7958)
- Xia Zhang (ORCID: https://orcid.org/0000-0003-4843-8944)
- Yuxuan Sun
- Yihan Wu (ORCID: https://orcid.org/0009-0000-1610-139X)
- Yanan Feng
- Xuan Fang (ORCID: https://orcid.org/0000-0003-1286-2743)
- Zhiping Kou
- Juan Tuo
Institutions
- Queen's University Belfast (GB)
- Sun Yat-sen University (CN)
- Shanxi University (CN)
- Ludong University (CN)
- Chinese Academy of Sciences (CN)
- Dalian University of Technology (CN)
- Xinjiang Astronomical Observatory (CN)
- Purple Mountain Observatory (CN)
- Xinjiang Entry-Exit Inspection and Quarantine Bureau (CN)
- Beijing National Laboratory for Molecular Sciences (CN)
- Anyang Normal University (CN)
- Nicolaus Copernicus Astronomical Center (PL)
- State Radio Regulation Of China (CN)
- Astronomy and Space (AU)
- Nanjing Institute of Astronomical Optics & Technology (CN)
- Institute of Chemistry (CN)
- National Astronomical Observatories (CN)
- University of Chinese Academy of Sciences (CN)
- East China Normal University (CN)
- University of Hong Kong (HK)
- Xinjiang University (CN)
Publication Details
- Journal
- Monthly Notices of the Royal Astronomical Society
- Published
- 2025-10-11
- DOI
- https://doi.org/10.1093/mnras/staf1734
- Primary Topic
- Astrophysics and Star Formation Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Natural Science Foundation of Xinjiang
- Science and Technology Facilities Council