JWST observations of the Ring Nebula (NGC 6720) -- II. PAH emission
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| Autores principales: | , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Clark, Nicholas Peeters, Els Cox, Nick L. J. Cami, Jan Barlow, Michael J. Kavanagh, Patrick J. Van de Steene, Griet Matsuura, Mikako Zijlstra, Albert Aleman, Isabel Bernard-Salas, Jeronimo Dinerstein, Harriet L. Justtanont, Kay Kaplan, Kyle F. Manchado, Arturo Sahai, Raghvendra van Hoof, Peter Volk, Kevin Wesson, Roger |
| author_facet | Clark, Nicholas Peeters, Els Cox, Nick L. J. Cami, Jan Barlow, Michael J. Kavanagh, Patrick J. Van de Steene, Griet Matsuura, Mikako Zijlstra, Albert Aleman, Isabel Bernard-Salas, Jeronimo Dinerstein, Harriet L. Justtanont, Kay Kaplan, Kyle F. Manchado, Arturo Sahai, Raghvendra van Hoof, Peter Volk, Kevin Wesson, Roger |
| contents | Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in clumpy circumstellar environments, yet their formation and evolutionary pathways in such environments remain elusive. We aim to characterize the PAH emission in a clumpy planetary nebula to decipher their formation and evolution pathways. We obtained JWST Near-Infrared Spectrograph (NIRSpec) and Mid-Infrared Instrument (MIRI) integral field unit spectroscopic observations of two individual knots in the Ring Nebula (NGC 6720), a clumpy planetary nebula, and determine the PAH spectral characteristics. We detect the 3.3 and 11.2 um PAH emission bands in both knots but do not detect PAH emission in the 6-9 um range. We supplement our data with Spitzer Infrared Spectrograph (IRS) Short-Low 1 (SL1) and SL2 data, containing 11.2, weak 6.2, and weak 7.7 um PAH emission bands. The JWST data confirm the unusual profile of the 11.2 um band, which is very broad and redshifted with respect to typical 11.2 um PAH profiles. We estimate the PAH population to be largely neutral. The relative integrated surface brightness of the 3.3 and 11.2 um bands indicates the presence of small-sized PAHs, consisting of 35 +/- 6 carbon atoms. We find that the PAH emission is concentrated outside of the clumps, in the inter-clump medium, and confirm the existence of enhanced PAH emission in a narrow 'PAH ring' centred on the central star. This morphology suggests that PAHs formed during the Ring Nebula's asymptotic giant branch phase, in the central star's dust-driven wind. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03451 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JWST observations of the Ring Nebula (NGC 6720) -- II. PAH emission Clark, Nicholas Peeters, Els Cox, Nick L. J. Cami, Jan Barlow, Michael J. Kavanagh, Patrick J. Van de Steene, Griet Matsuura, Mikako Zijlstra, Albert Aleman, Isabel Bernard-Salas, Jeronimo Dinerstein, Harriet L. Justtanont, Kay Kaplan, Kyle F. Manchado, Arturo Sahai, Raghvendra van Hoof, Peter Volk, Kevin Wesson, Roger Solar and Stellar Astrophysics Astrophysics of Galaxies Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in clumpy circumstellar environments, yet their formation and evolutionary pathways in such environments remain elusive. We aim to characterize the PAH emission in a clumpy planetary nebula to decipher their formation and evolution pathways. We obtained JWST Near-Infrared Spectrograph (NIRSpec) and Mid-Infrared Instrument (MIRI) integral field unit spectroscopic observations of two individual knots in the Ring Nebula (NGC 6720), a clumpy planetary nebula, and determine the PAH spectral characteristics. We detect the 3.3 and 11.2 um PAH emission bands in both knots but do not detect PAH emission in the 6-9 um range. We supplement our data with Spitzer Infrared Spectrograph (IRS) Short-Low 1 (SL1) and SL2 data, containing 11.2, weak 6.2, and weak 7.7 um PAH emission bands. The JWST data confirm the unusual profile of the 11.2 um band, which is very broad and redshifted with respect to typical 11.2 um PAH profiles. We estimate the PAH population to be largely neutral. The relative integrated surface brightness of the 3.3 and 11.2 um bands indicates the presence of small-sized PAHs, consisting of 35 +/- 6 carbon atoms. We find that the PAH emission is concentrated outside of the clumps, in the inter-clump medium, and confirm the existence of enhanced PAH emission in a narrow 'PAH ring' centred on the central star. This morphology suggests that PAHs formed during the Ring Nebula's asymptotic giant branch phase, in the central star's dust-driven wind. |
| title | JWST observations of the Ring Nebula (NGC 6720) -- II. PAH emission |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.03451 |