2000/05/01 by A. C. A. Boogert, A. G. G. M. Tielens, Boogert, A. C. A. +17 · 1 citation
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #Atmospheric Ozone and Climate #FOS: Physical sciences #Molecular Spectroscopy and Structure #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0005030
18 pages and 14 figures, accepted for publication in A&A
openalex publication_date 2000/05/01 · arxiv created 2000/05/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have obtained the full 1-200 um spectrum of the low luminosity (36 Lsun)\nClass I protostar Elias 29 in the Rho Ophiuchi molecular cloud. It provides a\nunique opportunity to study the origin and evolution of interstellar ice and\nthe interrelationship of interstellar ice and hot core gases around low mass\nprotostars. We see abundant hot CO and H2O gas, as well as the absorption bands\nof CO, CO2, H2O and ``6.85 um'' ices. We compare the abundances and physical\nconditions of the gas and ices toward Elias 29 with the conditions around\nseveral well studied luminous, high mass protostars. The high gas temperature\nand gas/solid ratios resemble those of relatively evolved high mass objects\n(e.g. GL 2591). However, none of the ice band profiles shows evidence for\nsignificant thermal processing, and in this respect Elias 29 resembles the\nleast evolved luminous protostars, such as NGC 7538 : IRS9. Thus we conclude\nthat the heating of the envelope of the low mass object Elias 29 is\nqualitatively different from that of high mass protostars. This is possibly\nrelated to a different density gradient of the envelope or shielding of the\nices in a circumstellar disk. This result is important for our understanding of\nthe evolution of interstellar ices, and their relation to cometary ices.\n