Survival of Molecular Complexity under Recent Supernova Feedback: Detection of Hot Cores in RX J1713.7-3946

Abstract

Protostellar cores located near supernova remnants are considered potential analogues of the birth environment of the solar system. However, the extent to which supernovae influence their chemical evolution remains unclear. We report the first detection of hot molecular cores in a supernova remnant using the Atacama Large Millimeter/submillimeter Array. The detected hot cores (HC1 and HC2) are located inside the X-ray shell of the young supernova remnant RX J1713.7-3946, and both sources are associated with Class I intermediate-mass protostars. This paper focuses on a detailed chemical analysis of HC1, in which a variety of carbon-, oxygen-, nitrogen-, sulfur-, and silicon-bearing species are detected. Excitation analyses indicate that HC1 harbors dense (~10^7 cm-3), compact (<500 au), and high-temperature (>100K) molecular gas. Despite being located within a supernova-feedback region, the column density ratios of complex organic molecules (HCOOCH3/CH3OH, CH3OCH3/CH3OH, and CH3CHO/CH3OH), a deuterated molecule (CH2DOH/CH3OH), and sulfur- and nitrogen-bearing species (OCS/CH3OH and C2H5CN/CH3CN) in HC1 are indistinguishable from those observed in hot cores/corinos in more typical star-forming environments. HC1 is located near the outer edge of the supernova shell, and the surrounding region has likely begun to be exposed to such a harsh environment only recently. The elapsed time since the onset of exposure to high-energy particles and photons may be too short for the chemical composition of the hot core to be significantly altered, and/or the hot-core region may be shielded by magnetic fields amplified by supernova feedback, which could suppress the penetration of enhanced cosmic rays.

Published in ApJ, 25 pages, 9 figures, 11 tables

References in corpus (68)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• A computer program for fast non-LTE analysis of interstellar line spectra
• CASA, the Common Astronomy Software Applications for Radio Astronomy
• Observations of the Icy Universe
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• Our astrochemical heritage
• The Birth Environment of the Solar System
• A three-phase chemical model of hot cores: the formation of glycine
• Testing grain-surface chemistry in massive hot-core regions
• What is the Total Deuterium Abundance in the Local Galactic Disk?
• Does IRAS 16293-2422 have a hot core? Chemical inventory and abundance changes in its protostellar environment
• Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and compact source catalogues. First data release for Inner Milky Way: +68°> l > -70°
• Toward Understanding the Cosmic-ray Acceleration at Young Supernova Remnants Interacting with Interstellar Clouds: Possible Applications to RX J1713.7-3946
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Cosmic-ray ionisation in circumstellar discs
• The Physical and Chemical Structure of Hot Molecular Cores
• The ALMA-PILS survey: Inventory of complex organic molecules towards IRAS 16293-2422 A
• Infalling-Rotating Motion and Associated Chemical Change in the Envelope of IRAS 16293-2422 Source A Studied with ALMA
• Ingredients for Solar-like Systems: protostar IRAS 16293-2422 B versus comet 67P/Churyumov-Gerasimenko
• Complex organic molecules in the Galactic Centre: the N-bearing family
• Multilayer formation and evaporation of deuterated ices in prestellar and protostellar cores
• A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence
• Formation and recondensation of complex organic molecules during protostellar luminosity outbursts
• The census of interstellar complex organic molecules in the Class I hot corino of SVS13-A
• The ALMA-PILS survey: Complex nitriles towards IRAS 16293--2422
• Complex organic molecules in low-mass protostars on solar system scales -- I. Oxygen-bearing species
• Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores
• Water deuteration and ortho-to-para nuclear spin ratio of H2 in molecular clouds formed via the accumulation of HI gas
• Supernova enhanced cosmic ray ionization and induced chemistry in a molecular cloud of W51C
• Reconstructing the history of water ice formation from HDO/H2O and D2O/HDO ratios in protostellar cores
• Investigating the Cosmic-Ray Ionization Rate Near the Supernova Remnant IC 443 Through H3+ Observations
• Phosphorus in the Young Supernova Remnant Cassiopeia A
• Star Forming Dense Cloud Cores in the TeV γ-ray SNR RX J1713.7-3946
• The organic chemistry in the innermost, infalling envelope of the Class 0 protostar L483
• Supernova Remnants Interacting with Molecular Clouds: X-ray and Gamma-ray Signatures
• First Abundance Measurement of Organic Molecules in the Atmosphere of HH 212 Protostellar Disk
• Direct measurements of carbon and sulfur isotope ratios in the Milky Way
• Complex organic molecules in low-mass protostars on Solar System scales -- II. Nitrogen-bearing species
• Non-thermal X-rays and interstellar gas toward the γ-ray supernova remnant RX J1713.7-3946: Evidence for X-ray enhancement around CO and HI clumps
• Supernova remnants in clumpy media: particle propagation and gamma-ray emission
• Photoelectric cross-sections of gas and dust in protoplanetary disks
• Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A
• N-bearing complex organics toward high-mass protostars: Constant ratios pointing to formation in similar pre-stellar conditions across a large mass range
• X-ray observations of the compact central object in supernova remnant G347.3-0.5
• Survey of Ices toward Massive Young Stellar Objects: I. OCS, CO, OCN${}^{-}$, and CH${}_3$OH
• Deuterium Fractionation: the Ariadne's Thread from the Pre-collapse Phase to Meteorites and Comets today
• CoCCoA: Complex Chemistry in hot Cores with ALMA. Selected oxygen-bearing species
• Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars
• JWST Observations of Young protoStars (JOYS): overview of program and early results
• ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A Hot Corino Survey toward Protostellar Cores in the Orion Cloud
• 3 to 12 millimetre studies of dense gas towards the western rim of supernova remnant RX J1713.7-3946
• Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and its Hot Corino
• The prebiotic molecular inventory of Serpens SMM1 I. An investigation of the isomers CH${}_3$NCO and HOCH${}_2$CN
• Expansion measurement of Supernova Remnant RX J1713.7-3946
• Pursuing the origin of the gamma rays in RX J1713.7$-$3946 quantifying the hadronic and leptonic components
• Importance of source structure on complex organics emission. I. Observations of CH${}_3$OH from low-mass to high-mass protostars
• Methanol deuteration in high-mass protostars
• Modelling Deuterated Isotopologues of Methanol toward the Pre-Stellar Core L1544
• ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7-3946: Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc scales
• The interstellar medium in young supernova remnants: key to the production of cosmic X-rays and $\gamma$-rays
• Correlations of Methyl Formate (CH3OCHO), Dimethyl Ether (CH3OCH3) and Ketene (H2CCO) in High-mass Star-forming Regions
• SO2 and OCS toward high-mass protostars: A comparative study between ice and gas
• Optical reconstruction of dust in the region of SNR RX J1713.7-3946 from astrometric data
• High-energy astrochemistry in the molecular interstellar medium
• Cosmic-ray-driven enhancement of the C${}^0$/CO abundance ratio in W51C
• Cosmic-Ray Bath in a Past Supernova Gives Birth to Earth-Like Planets
• Chemical complexity in star formation induced by stellar feedback: cores shock-formed by the supernova remnant W44