Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Faculty Publications Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Creator An entity primarily responsible for making the resource Arun, Roy; Mathew, Blesson; Shridharan, Baskaran; Ujjwal, Krishnan; Akhil, Krishna R; Gopinathan, Maheswar; Kartha, Sreeja S. Title A name given to the resource Polycyclic Aromatic Hydrocarbons in the Circumstellar Medium of Herbig Ae/Be Stars Date A point or period of time associated with an event in the lifecycle of the resource 01-01-2025 Source A related resource from which the described resource is derived Research in Astronomy and Astrophysics;Volume;25;Issue;9;Article No.;95005; Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1088/1674-4527/ade65c" target="_blank" rel="noreferrer noopener">https://doi.org/10.1088/1674-4527/ade65c</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105011196686?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105011196686?origin=resultslist</a> Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Arun R., Indian Institute of Astrophysics, Sarjapur Road, Koramangala, Bangalore, 560034, India; Mathew B., Center of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Shridharan B., Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India; Ujjwal K., Center of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Akhil K.R., Center of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Gopinathan M., Indian Institute of Astrophysics, Sarjapur Road, Koramangala, Bangalore, 560034, India; Kartha S.S., Center of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India Description An account of the resource We present a comprehensive mid-infrared spectroscopic survey of 124 Herbig Ae/Be stars using newly processed Spitzer/IRS spectra from the newly released CASSISjuice database. Based on prominent dust and molecular signatures (polycyclic aromatic hydrocarbons (PAHs), silicates, and hydrogenated amorphous carbons), we classify the stars into five groups. Our analysis reveals that 64% of the spectra show PAH emission, with detections peaking in the stellar effective temperature range 7000-11,000 K (B9-A5). Silicate features appear in 50% of the sample and likewise diminish at higher temperatures. Additionally, we find that future PAH studies can focus on Herbig Ae/Be stars with a spectral index n2?24 &gt; ?1 and flared morphologies to maximize PAH detections. The 6.2 ?m PAH band is the most frequently observed in our sample, shifting blueward with increasing stellar temperature, and this is the largest sample yet used to test that peak shift. The weaker 6.0 ?m feature does not shift with 6.2 ?m, implying a distinct origin of C=O (carbonyl) or olefinic C=C stretching relative to C-C vibrations. We examined the 11.0/11.2 ?m PAH ratio using high-resolution Spitzer spectra for the first time in a sample of Herbig Ae/Be stars, finding a range of ionization conditions. This study provides a strong foundation for future JWST observations of intermediate-mass pre-main-sequence stars. 2025. National Astronomical Observatories, CAS and IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved. Subject The topic of the resource astrochemistry; catalogs; stars: variables: T Tauri, Herbig Ae/Be; techniques: spectroscopic Publisher An entity responsible for making the resource available Institute of Physics Relation A related resource ISSN: 16744527; Language A language of the resource English Type The nature or genre of the resource Article Rights Information about rights held in and over the resource Restricted Access; Hardcopy may be available in the library Format The file format, physical medium, or dimensions of the resource online