Digging into the Massive Protostar S255IR NIRS3: A Study of Nitrogen-Bearing Molecules and Their Prebiotic Chemistry

Abstract

The study of complex nitrogen (N)-bearing molecules is essential for probing the physical and chemical evolution of star-forming regions. In this paper, we present the identification of rotational emission lines from several complex N-bearing species such as methyl cyanide (CH${}_3$CN), ethyl cyanide (C${}_2$H${}_5$CN), vinyl cyanide (C${}_2$H${}_3$CN), cyanamide (NH${}_2$CN), and formamide (NH${}_2$CHO) toward the high-mass protostar S255IR NIRS3 using ALMA band 4 observations. In addition, the vibrationally excited transitions of cyanoacetylene (HC${}_3$N, ${\nu }_7$ = 2) were detected. The column densities and excitation temperatures of these molecules were derived through LTE spectral modelling, yielding excitation temperatures in the range of 175$-$220 K. The high excitation temperatures (175$-$220 K) indicate that the identified N-bearing molecules arise from the warm inner regions ($T\ge 100$ K) of the source. The fractional abundances were further estimated relative to H${}_2$, CH${}_3$OH, and CH${}_3$CN. A Pearson correlation heat map of the abundances reveals a strong positive correlation ($r>0.7$) among three molecules in the cyanide family, such as CH${}_3$CN, C${}_2$H${}_3$CN, and C${}_2$H${}_5$CN, suggesting that these N-bearing molecules may be chemically linked. Comparison with three-phase warm-up chemical models shows that the observed abundances of CH${}_3$CN, C${}_2$H${}_5$CN, C${}_2$H${}_3$CN, NH${}_2$CN, NH${}_2$CHO, and HC${}_3$N (${\nu }_7$ = 2) relative to H${}_2$ are consistent with model predictions within factors of 1.04, 0.67, 1.28, 0.76, 0.72, and 0.96, respectively. Finally, we discuss the potential formation pathways of the identified N-bearing molecules in the context of gas-grain chemistry within S255IR NIRS3.

arXiv commentPublished in The Astronomical Journal (AJ)

References in corpus (91)

• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Embedded Clusters in Molecular Clouds
• The UMIST database for astrochemistry 2012
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• The Birth Environment of the Solar System
• A three-phase chemical model of hot cores: the formation of glycine
• Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)
• The 2014 KIDA network for interstellar chemistry
• An Accurate Flux Density Scale from 50 MHz to 50 GHz
• 2MASS Observations of the Perseus, Orion A, Orion B, and Monoceros R2 Molecular Clouds
• Astrochemistry During the Formation of Stars
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Astronomical identification of CN-, the smallest observed molecular anion
• Complex molecules in the hot core of the low mass protostar NGC1333-IRAS4A
• Detection of C5N- and vibrationally excited C6H in IRC +10216
• Spatially Resolved Chemistry in Nearby Galaxies I. The Center of IC 342
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2)
• Cometary Chemistry and the Origin of Icy Solar System Bodies, the view after Rosetta
• Formation of complex organic molecules in hot molecular cores through nondiffusive grain-surface and ice-mantle chemistry
• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• Questioning the spatial origin of complex organic molecules in young protostars with the CALYPSO survey
• Can Formamide Be Formed on Interstellar Ice? An Atomistic Perspective
• Complex organic molecules in comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy): detection of ethylene glycol and formamide
• Detection of circumstellar CH2CHCN, CH2CN, CH3CCH and H2CS
• The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars
• The formation of ethylene glycol and other complex organic molecules in star-forming regions
• A modular set of synthetic spectral energy distributions for young stellar objects
• Modeling the Lukewarm Corino Phase - is L1527 unique?
• The ALMA-PILS survey: Complex nitriles towards IRAS 16293--2422
• The complex chemistry of hot cores in Sagittarius B2(N): Influence of cosmic-ray ionization and thermal history
• Probing non polar interstellar molecules through their protonated form: Detection of protonated cyanogen (NCCNH+)
• Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores
• Ethyl cyanide on Titan: Spectroscopic detection and mapping using ALMA
• Exploring molecular complexity with ALMA (EMoCA): Simulations of branched carbon-chain chemistry in Sgr B2(N)
• H2O masers in a jet-driven bowshock: Episodic ejection from a massive young stellar object
• A spectral survey of the Star Forming Core of the Orion Nebula from 455 -- 507 GHz
• SMA millimeter observations of Hot Molecular Cores
• Rotational spectroscopy of isotopic vinyl cyanide, H${}_2$C=CH$-$C$\equiv$N, in the laboratory and in space
• Reactivity of HCO with CH3 and NH2 on Water Ice Surfaces. A Comprehensive Accurate Quantum Chemistry Study
• Laboratory Characterization and Astrophysical Detection of Vibrationally Excited States of Vinyl Cyanide in Orion-KL
• Quantum mechanical simulations of the radical-radical chemistry on icy surfaces
• Evolutionary study of complex organic molecules in high-mass star-forming regions
• Comparative study of complex N- and O-bearing molecules in hot molecular cores
• Rotational spectra of isotopic species of methyl cyanide, CH${}_3$CN, in their ground vibrational states up to terahertz frequencies
• Molecules with ALMA at Planet-forming Scales (MAPS). IX. Distribution and Properties of the Large Organic Molecules HC${}_3$N, CH${}_3$CN, and $c$-C${}_3$H${}_2$
• Complex organic molecules in low-mass protostars on Solar System scales -- II. Nitrogen-bearing species
• Different Evolutionary Stages in the Massive Star Forming Region S255 Complex
• Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
• Radio outburst from a massive (proto)star. When accretion turns into ejection
• First detection of cyanamide (NH${}_2$CN) towards solar-type protostars
• Detection of the Ammonium Ion in Space
• The disk-outflow system in the S255IR area of high mass star formation
• Discovery of the elusive radical NCO and confirmation of H2NCO+ in space
• The family of amide molecules toward NGC 6334I
• Giant burst of methanol maser in S255IR-NIRS3
• The ALMA-PILS survey: Stringent limits on small amines and nitrogen-oxides towards IRAS 16293-2422B
• The ALMA-PILS survey: 3D modeling of the envelope, disks and dust filament of IRAS 16293-2422
• The GUAPOS project II. A comprehensive study of peptide-like bond molecules
• History of the solar-type protostar IRAS16293-2422 as told by the cyanopolyynes
• PRODIGE -- Envelope to Disk with NOEMA II. Small-scale temperature structure and a streamer feeding the SVS13A protobinary using CH3CN and DCN
• Structure of the hot molecular core G10.47+0.03
• N-bearing complex organics toward high-mass protostars: Constant ratios pointing to formation in similar pre-stellar conditions across a large mass range
• Isocyanogen formation in the cold interstellar medium
• Cyanopolyyne Chemistry around Massive Young Stellar Objects
• Complex Organic Molecules at High Spatial Resolution Toward Orion-KL II: Kinematics
• Far-infrared laboratory spectroscopy of aminoacetonitrile and first interstellar detection of its vibrationally excited transitions
• The first bird's-eye view of a gravitationally unstable accretion disk in high-mass star formation
• ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
• The complex organic molecular content in the L1517B starless core
• An Expanded Gas-Grain Model for Interstellar Glycine
• Extended warm gas in Orion KL as probed by methyl cyanide
• Exploring molecular complexity with ALMA (EMoCA): Complex isocyanides in Sgr B2(N)
• The role of low-mass star clusters in massive star formation. The Orion Case
• 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
• FAUST IX. Multi-band, multi-scale dust study of L1527 IRS. Evidence for dust properties variations within the envelope of a Class 0/I YSO
• A sub-arcsecond study of the hot molecular core in G023.01-00.41
• Dense Cores, Filaments and Outflows in the S255IR Region of High Mass Star Formation
• ${}^{14}$N/${}^{15}$N isotopic ratio in CH${}_3$CN of Titan's atmosphere measured with ALMA
• CH${}_3$CN deuteration in the SVS13-A Class I hot-corino. SOLIS XV
• Water maser variability in a high-mass YSO outburst -- VERA and ALMA observations of S255 NIRS 3
• Cyanopolyyne chemistry in the L1544 prestellar core: new insights from GBT observations
• Detection of interstellar cyanamide (NH${}_2$CN) towards the hot molecular core G10.47+0.03
• The TOPGöt high-mass star-forming sample. I. Methyl cyanide emission as tracer of early phases of star formation
• Identification of interstellar cyanamide towards the hot molecular core G358.93-0.03 MM1
• 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
• Detection of complex nitrogen-bearing molecule ethyl cyanide towards the hot molecular core G10.47+0.03
• Spectral survey of a Hot core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The discovery of class I and class II millimeter methanol maser transitions
• Observation of Complex Organic Molecules Containing Peptide-like Bonds Toward Hot Core G358.93$-$0.03 MM1
• Study of Complex Nitrogen and Oxygen-bearing Molecules toward the High-mass Protostar IRAS 18089$-$1732
• Modeling Two First Hydrostatic Core Candidates Barnard 1b-N and 1b-S