Skip to content
DraconiticResearch
Search Sources API
190,335 studies31 sourcesUpdated 18 min ago
Peer-reviewedCC BY 4.0The Astrophysical Journal

A Cyanopolyyne-rich but Complex-organic-molecule-poor Massive Protostar: The First Hot Carbon-chain Chemistry Source G28.28-0.36

  • Kotomi Taniguchi1,2
  • Masao Saito1,2
  • Prasanta Gorai3,4
  • Olli Sipilä5
  • Kazuhito Dobashi6
  • Paola Caselli5
  • Tirupati Kumara Sridharan7
  • Tomomi Shimoikura8
  • Jonathan C. Tan9,10
10 affiliations
  1. 1National Institutes of Natural Sciences
  2. 2The Graduate University for Advanced Studies
  3. 3University of Oslo
  4. 4Universität Heidelberg
  5. 5Max-Planck-Institut für extraterrestrische Physik
  6. 6Tokyo Gakugei University
  7. 7National Radio Astronomy Observatory
  8. 8Otsuma Women’s University Chiyoda
  9. 9Chalmers University of Technology
  10. 10University of Virginia
Open at sourcePDFDOICite

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 (HC ₃ N and HC ₅ N) and three complex organic molecules (COMs; CH ₃ OH, CH ₃ CN, and CH ₃ CHO) 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 ₅ N emission is coincident with the dust continuum peak, where an excitation temperature of 100 K is derived from CH ₃ CN. 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.

Related

  1. 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 +6
    arXivPreprintCC BY 4.0Full textGalaxiesSolar & stellar physicsarXiv
  2. Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) III. CH3OH isotopic fractionation in the low-mass protostar BHR71-IRS1
    A. Coutens, F. Cruz-Sáenz de Miera, J. K. Jørgensen +26
    arXivPreprintCC BY 4.0Full textGalaxiesSolar & stellar physicsarXiv
  3. Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS). VIII. First interstellar detection of fully deuterated methyl cyanide
    A. Belloche, J. K. Jorgensen, M. N. Drozdovskaya +12
    Astronomy & AstrophysicsPeer-reviewedPublisher termsSolar & stellar physicsCrossref
  4. Interstellar Complex Organic Molecules and Molecular Outflows in NGC 1333 IRAS 4B and 4B' Observed Using NOEMA
    C. C. Sarver, M. M. Giese, D. C. Lis +1
    arXivPreprintCC BY 4.0Full textGalaxiesSolar & stellar physicsarXiv
  5. Origins of complex organic molecules in L1551 IRS 5: Interplay of thermal heating and accretion shocks
    Ji-hyun Kang, Jeong-Eun Lee, Seokho Lee +1
    arXivPreprintarXiv licenceFull textGalaxiesSolar & stellar physicsarXiv

Cite

BibTeXRIS
BibTeX
@article{taniguchi2026cyanopolyynerich,
  title = {{A Cyanopolyyne-rich but Complex-organic-molecule-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},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = nov,
  doi = {10.3847/1538-4357/aeacdb},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aeacdb},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - A Cyanopolyyne-rich but Complex-organic-molecule-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  - 2026/11/02
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aeacdb
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aeacdb
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 ₃ N and HC ₅ N) and three complex organic molecules (COMs; CH ₃ OH, CH ₃ CN, and CH ₃ CHO) 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 ₅ N emission is coincident with the dust continuum peak, where an excitation temperature of 100 K is derived from CH ₃ CN. 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.
SN  - 1538-4357
SN  - 0004-637X
ER  -