Carbon-Chain Chemistry vs. Complex-Organic-Molecule Chemistry in Envelopes around Three Low-Mass Young Stellar Objects in the Perseus Region

Abstract

We have analyzed ALMA Cycle 5 data in Band 4 toward three low-mass young stellar objects (YSOs), IRAS 03235+3004 (hereafter IRAS 03235), IRAS 03245+3002 (IRAS 03245), and IRAS 03271+3013 (IRAS 03271), in the Perseus region. The HC${}_3$N ($J=16-15$; $E_{\mathrm{up}}/k=59.4$ K) line has been detected in all of the target sources, while four CH${}_3$OH lines ($E_{\mathrm{up}}/k=15.4-36.3$ K) have been detected only in IRAS 03245. Sizes of the HC${}_3$N distributions ($\sim 2930-3230$ au) in IRAS 03235 and IRAS 03245 are similar to those of the carbon-chain species in the warm carbon chain chemistry (WCCC) source L1527. The size of the CH${}_3$OH emission in IRAS 03245 is $\sim 1760$ au, which is slightly smaller than that of HC${}_3$N in this source. We compare the CH${}_3$OH/HC${}_3$N abundance ratios observed in these sources with predictions of chemical models. We confirm that the observed ratio in IRAS 03245 agrees with the modeled values at temperatures around 30--35 K, which supports the HC${}_3$N formation by the WCCC mechanism. In this temperature range, CH${}_3$OH does not thermally desorb from dust grains. Non-thermal desorption mechanisms or gas-phase formation of CH${}_3$OH seem to work efficiently around IRAS 03245. The fact that IRAS 03245 has the highest bolometric luminosity among the target sources seems to support these mechanisms, in particular the non-thermal desorption mechanisms.

arXiv commentAccepted by The Astrophysical Journal, 13 pages, 5 figures, 7 tables

References in corpus (35)

• From Molecular Cores to Planet-forming Disks: A SIRTF Legacy Program
• Our astrochemical heritage
• Properties of the Youngest Protostars in Perseus, Serpens, and Ophiuchus
• Gas and grain chemical composition in cold cores as predicted by the Nautilus 3-phase model
• Formation of complex organic molecules in cold objects: the role of gas phase reactions
• Young Stellar Objects in the Gould Belt
• Astrochemistry During the Formation of Stars
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Astrochemistry and compositions of planetary systems
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• The Gould's Belt Distances Survey (GOBELINS). V. Distances and Kinematics of the Perseus molecular cloud
• The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars
• Formation of Complex Organic Molecules in Cold Interstellar Environments through non-diffusive grain-surface and ice-mantle chemistry
• On Cosmic Ray-Driven Grain Chemistry in Cold Core Models
• A Survey of CH3CN and HC3N in Protoplanetary Disks
• Modeling the Lukewarm Corino Phase - is L1527 unique?
• Chemical differentiation in a prestellar core traces non-uniform illumination
• SOLIS II. Carbon-chain growth in the Solar-type protocluster OMC2-FIR4
• Prevalence of Complex Organic Molecules in Starless and Prestellar Cores within the Taurus Molecular Cloud
• Complex Organic Molecules Towards Embedded Low-Mass Protostars
• Chronology of Episodic Accretion in Protostars -- an ALMA survey of the CO and H${}_2$O snowlines
• Chemical complexity induced by efficient ice evaporation in the Barnard 5 molecular cloud
• SOLIS IV. Hydrocarbons in the OMC-2 FIR 4 region, a probe of energetic particle irradiation of the region
• Carbon Chains and Methanol toward Embedded Protostars
• Cyanopolyyne Chemistry around Massive Young Stellar Objects
• Survey Observations to Study Chemical Evolution from High-mass Starless Cores to High-mass Protostellar Objects I: HC3N and HC5N
• An unbiased spectral line survey observation toward the low-mass star-forming region L1527
• Survey Observations to Study Chemical Evolution from High-Mass Starless Cores to High-Mass Protostellar Objects II. HC${}_3$N and N${}_2$H${}^{+}$
• Carbon Chain Molecules Toward Embedded Low-Mass Protostars
• The Role of Radiolysis in the Modelling of C${}_2$H${}_4$O${}_2$ Isomers and Dimethyl Ether in Cold Dark Clouds
• ALMA observations of envelopes around first hydrostatic core candidates
• Interaction between the Outflow and the Core in IRAM 04191+1522
• Carbon Chain Chemistry in Hot-Core Regions around Three Massive Young Stellar Objects Associated with 6.7 GHz Methanol Masers
• Methanol in the L1551 Circumbinary Torus
• Investigation of Chemical Differentiation among the NGC2264 Cluster-Forming Clumps

Cited by in corpus (5)

• Sulphur-rich cold gas around the hot core precursor G328.2551-0.5321. An APEX unbiased spectral survey of the 2 mm, 1.2 mm, and 0.8 mm atmospheric windows
• Vibrationally-excited Lines of HC${}_3$N Associated with the Molecular Disk around the G24.78+0.08 A1 Hyper-compact H${}_{\mathrm{II}}$ Region
• Chemical compositions in the vicinity of protostars in Ophiuchus
• Parsec scales of carbon chain and complex organic molecules in AFGL 2591 and IRAS 20126
• Clump-scale chemistry in the NGC2264-D cluster-forming region