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PreprintCC BY 4.0arXiv

A Cyanopolyyne-rich but COM-poor Massive Protostar: The First Hot Carbon Chain Chemistry Source G28.28-0.36

  • Kotomi Taniguchi
  • Masao Saito
  • Prasanta Gorai
  • Olli Sipilä
  • Kazuhito Dobashi
  • Paola Caselli
  • Tirupati Kumara Sridharan
  • Tomomi Shimoikura
  • Jonathan C. Tan
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Abstract

We present molecular emission line data from the massive young stellar object (MYSO) G28.28-0.36 (G28.28) obtained with the Atacama Large Millimeter/submillimeter Array Band 3. Cyanopolyynes (HC3N and HC5N) and three complex organic molecules (COMs; CH3OH, CH3CN, and CH3CHO) are detected from the MYSO G28.28. In addition, strong emission regions of cyanopolyynes are identified between G28.28 and a nearby ultracompact H II region. The HC5N emission is coincident with the dust continuum peak, where an excitation temperature of 100 K is derived from CH3CN. These results suggest that the Hot Carbon Chain Chemistry (HCCC) mechanism produces cyanopolyynes in the hot region around G28.28. We find that G28.28 exhibits a unique chemical feature: cyanopolyynes are abundant, but COMs are deficient, unlike the other MYSOs studied previously. These results imply that G28.28 is a counterpart of the Warm Carbon Chain Chemistry (WCCC) low-mass source L1527. G28.28 is the first HCCC source identified so far.

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Cite

BibTeXRIS
BibTeX
@misc{taniguchi2026cyanopolyynerich,
  title = {{A Cyanopolyyne-rich but COM-poor Massive Protostar: The First Hot Carbon Chain Chemistry Source G28.28-0.36}},
  author = {Kotomi Taniguchi and Masao Saito and Prasanta Gorai and Olli Sipilä and Kazuhito Dobashi and Paola Caselli and Tirupati Kumara Sridharan and Tomomi Shimoikura and Jonathan C. Tan},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.30654},
  eprint = {2609.30654},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.30654},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - A Cyanopolyyne-rich but COM-poor Massive Protostar: The First Hot Carbon Chain Chemistry Source G28.28-0.36
AU  - Kotomi Taniguchi
AU  - Masao Saito
AU  - Prasanta Gorai
AU  - Olli Sipilä
AU  - Kazuhito Dobashi
AU  - Paola Caselli
AU  - Tirupati Kumara Sridharan
AU  - Tomomi Shimoikura
AU  - Jonathan C. Tan
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2609.30654
UR  - https://arxiv.org/abs/2609.30654
AB  - We present molecular emission line data from the massive young stellar object (MYSO) G28.28-0.36 (G28.28) obtained with the Atacama Large Millimeter/submillimeter Array Band 3. Cyanopolyynes (HC_3N and HC_5N) and three complex organic molecules (COMs; CH_3OH, CH_3CN, and CH_3CHO) are detected from the MYSO G28.28. In addition, strong emission regions of cyanopolyynes are identified between G28.28 and a nearby ultracompact H II region. The HC_5N emission is coincident with the dust continuum peak, where an excitation temperature of 100 K is derived from CH_3CN. These results suggest that the Hot Carbon Chain Chemistry (HCCC) mechanism produces cyanopolyynes in the hot region around G28.28. We find that G28.28 exhibits a unique chemical feature: cyanopolyynes are abundant, but COMs are deficient, unlike the other MYSOs studied previously. These results imply that G28.28 is a counterpart of the Warm Carbon Chain Chemistry (WCCC) low-mass source L1527. G28.28 is the first HCCC source identified so far.
ER  -