| Name: | Arun Roy |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2024_953 |
| Title : | Fullerene-Enriched YSOs: A Novel Class and Their Connection to Aromatic Evolution near B-type PMS Stars |
| Authors : | Arun Roy,Blesson Mathew, Maheswar Gopinathan, Manoj Puravankara, Shridharan Baskaran, Mayank Narang |
| Authors Affiliation: | Blesson Mathew, Shridharan Bhaskaran Affiliation (CHRIST (deemed to be university), Bangalore - 560029, India)
Arun Roy, Maheswar Gopinathan Affiliation (Indian Institute of Astrophysics, Bangalore - 560034, India)
Manoj Puravankara Affiliation (Tata Institute of Fundamental Research, Mumbai-400005, India)
Mayank Narang Affiliation (Academia Sinica Institute of Astronomy and Astrophysics, Taiwan) |
| Mode of Presentation: | Oral |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | We present a distinct category of B-type young stellar objects (YSOs) displaying Fullerene vibrational modes in their infrared spectra, characterized by exclusive C60 features in the 15–20 μm range and a prominent 6–9 μm plateau. These YSOs, situated at the end of their pre-main sequence lifetime, represent a new class with Fullerene signatures. Our study proposes a link between these objects and the aromatic evolution near B-type pre-main sequence (PMS) stars. We postulate a bottom-up formation scenario in which hydrogenated amorphous carbons (HACs) act as precursors, evolving into long-chain polycyclic aromatic hydrocarbons (PAHs) and Fullerenes. This process primarily occurs near young planetary nebulae (PNes), as suggested by Cami et al. (2018). Over a few million years, the extended PAH molecules disperse into the interstellar medium (ISM). When B-type stars form in proximity, photodissociation of PAHs occurs. Larger PAHs (Nc > 60) transition into Fullerenes, as proposed by Berné & Tielens (2012). Due to C_60's enhanced stability, it accumulates near newly formed B-type stars and their protoplanetary disks. |
