Astrochem Coffee
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Official account of the Astrochem Coffee Podcast! We'll post here with podcast-related announcements, as well as astrochemistry-relevant literature, job openings, prizes, conferences, etc throughout the month between episodes. coffee.astrochem.net
Ammonium salt formation and abundance in protoplanetary disks Ruaud et al. arXiv arxiv.org/abs/2608.02173
Ammonium salt formation and abundance in protoplanetary disks
Ammonium salts may represent an important reservoir of volatile species in Solar system primitive bodies, but the question of how and when these salts can form during the star formation process…
arxiv.org
Exploring the Limits of Spectral Line Stacking in Spectral Line Data and Application Toward the Detection of Bulk $^{13}$C Enrichment of Aromatics in TMC-1 Duffy et al. arXiv (ApJ) arxiv.org/abs/2607.27382
Exploring the Limits of Spectral Line Stacking in Spectral Line Data and Application Toward the Detection of Bulk $^{13}$C Enrichment of Aromatics in TMC-1
The formation history of polycyclic aromatic hydrocarbons (PAHs) in the interstellar medium remains a topic of active debate, with proposed mechanisms ranging from high-temperature stellar ejecta…
arxiv.org
A tale of two isotopes: Spatial variation in HCN fractionation toward young cores Jensen et al. arXiv (A&A) arxiv.org/abs/2607.26187
A tale of two isotopes: Spatial variation in HCN fractionation toward young cores
Context. Isotopic fractionation can serve as a powerful tracer of the chemical evolution during star and planet formation. To accurately interpret observations, it is crucial to identify the dominant…
arxiv.org
Laboratory spectroscopy, theoretical characterization, and astronomical search for syn-propenethial (CH2CHCHS) Molpeceres et al. arXiv (MNRAS) arxiv.org/abs/2607.24656
Laboratory spectroscopy, theoretical characterization, and astronomical search for syn-propenethial (CH2CHCHS)
We report the laboratory characterization of the higher-energy isomer of propenethial, syn-CH2CHCHS. While the lower-energy isomer, anti-CH2CHCHS, was detected in the interstellar medium during the…
arxiv.org
Kinetic and H-atom product study of the C + C6H6 reaction at low temperatures Hickson & Loison arXiv (ACS E&SC) arxiv.org/abs/2607.24428
Kinetic and H-atom product study of the C + C6H6 reaction at low temperatures
The reactions of atomic carbon in its ground electronic state configuration, C(3P), are potentially important processes in astrochemistry due to the large abundance of C(3P) atoms in the interstellar…
arxiv.org
When Two Worlds Collide: How Collisions Between Silicate and Carbonaceous Nanograins can Drive Complex Chemistry Kyriazis et al. arXiv (A&A) arxiv.org/abs/2607.22213
When Two Worlds Collide: How Collisions Between Silicate and Carbonaceous Nanograins can Drive Complex Chemistry
Our overall objective is to determine how collision velocity governs the interactions between silicate and carbonaceous nanograins. We aim to: i) identify collisional regimes capable of producing…
arxiv.org
Isomer-specific excitation of formic acid in collisions with helium atoms Sogomonyan et al. arXiv arxiv.org/abs/2607.14985
Isomer-specific excitation of formic acid in collisions with helium atoms
An accurate estimation of the molecular abundances of isomers in the interstellar medium (ISM) is necessary to unravel the underlying chemistry and physics. After the recent detections of both…
arxiv.org
Effect of Ice Charging on the Astrochemistry of Interstellar Sulfur Bearing Species on Amorphous Solid Water Vorsselmans et al. arXiv arxiv.org/abs/2607.09364
Effect of Ice Charging on the Astrochemistry of Interstellar Sulfur Bearing Species on Amorphous Solid Water
We aim to derive statistically robust and physically interpretable BE distributions for atomic S and the sulfur-bearing molecules H$_2$S, SO$_2$, and OCS on neutral and negatively charged ASW, and…
arxiv.org
Detection of the Polycyclic Aromatic Hydrocarbon Phenalene (C$_{13}$H$_{10}$) in the Very Low Luminosity Object (VeLLO) MC27/L1521F Wenzel et al. arXiv (ApJL) arxiv.org/abs/2607.08699
Detection of the Polycyclic Aromatic Hydrocarbon Phenalene (C$_{13}$H$_{10}$) in the Very Low Luminosity Object (VeLLO) MC27/L1521F
To date, 14 polycyclic aromatic hydrocarbons (PAHs) ranging in size from two to seven (including five- and six-membered) carbon rings have been detected in the starless dense core TMC-1 CP within the…
arxiv.org
Rotational excitation of thioformaldehyde (H2CS) in collisions with molecular hydrogen Dagdigian JCP pubs.aip.org/aip/jcp/arti...
pubs.aip.org
Simple cyanides and formylium ion isotopologues in early star-forming molecular cores Taboada et al. A&A www.aanda.org/articles/aa/...
Simple cyanides and formylium ion isotopologues in early star-forming molecular cores | Astronomy & Astrophysics (A&A)
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
aanda.org
Distributed Peer Review at ALMA: An Empirical Comparison with Panel-Based Review Carpenter and Corvillón ApJ iopscience.iop.org/article/10.1...
High $^{12}$C/$^{13}$C isotopic ratios toward G+0.693-0.027: evidence for gas inflow to the Central Molecular Zone Colzi et al. arXiv (A&A) arxiv.org/abs/2607.06541
High $^{12}$C/$^{13}$C isotopic ratios toward G+0.693-0.027: evidence for gas inflow to the Central Molecular Zone
Isotopic ratios are key tracers of Galactic chemical evolution because different isotopes are synthesized through distinct stellar nucleosynthesis processes. While the $^{12}$C/$^{13}$C ratio…
arxiv.org
Excitation of warm HD and H$_2$ and implications for the interstellar deuterium abundance Neufeld arXiv (ApJ) arxiv.org/abs/2607.03816
Excitation of warm HD and H$_2$ and implications for the interstellar deuterium abundance
Rotational emission from HD provides a direct probe of deuterium in warm molecular gas, but the conversion of HD line fluxes to total column densities is sensitive to non-LTE excitation. I present…
arxiv.org
The Galactic Centre G+0.633-0.0604 molecular cloud: a new astrochemical gold mine. I. Gas physical properties San Andrés et al. arXiv (A&A) arxiv.org/abs/2607.01481
The Galactic Centre G+0.633-0.0604 molecular cloud: a new astrochemical gold mine. I. Gas physical properties
In the Central Molecular Zone (CMZ), shocks play a key role in triggering star formation and driving chemical enrichment. The Sgr B2 complex is a prime template, hosting massive protoclusters (N, M,…
arxiv.org
Discovery of sulfur oxides in the ejecta of a B[e] supergiant Bordiu et al. arXiv (ApJL) arxiv.org/abs/2607.02191
Discovery of sulfur oxides in the ejecta of a B[e] supergiant
B[e] supergiants represent a rare class of luminous, evolved massive stars surrounded by dusty circumstellar disks. Since their intense UV fields were long thought to sterilize their surroundings,…
arxiv.org
Searching for the elusive CH2+ with the James Webb Space Telescope. Another carbocation to constrain astrochemical networks Zannese et al. arXiv (A&A) arxiv.org/abs/2607.01155
Searching for the elusive CH2+ with the James Webb Space Telescope. Another carbocation to constrain astrochemical networks
Carbocations are key species in interstellar chemistry, providing entry points for building larger hydrocarbons. CH+, and more recently, CH3+, have been detected. Other carbocations await detection…
arxiv.org
Evolution of Chemistry in the envelope of HOt corinoS (ECHOS). III. Sulphur chemistry in the Class 0 objects HH 212 and NGC 1333 IRAS 4A Fernández-Ruiz et al. arXiv (A&A) arxiv.org/abs/2607.00729
Evolution of Chemistry in the envelope of HOt corinoS (ECHOS). III. Sulphur chemistry in the Class 0 objects HH 212 and NGC 1333 IRAS 4A
Our goal is to find chemical diagnostics to determine the physical conditions in protostellar envelopes and help establish the development of matter during the formation of a low-mass star, as well…
arxiv.org
Astrochemical Study of Early Embedded Disks Bianchi arXiv (Frontiers) arxiv.org/abs/2606.27278
Astrochemical Study of Early Embedded Disks
The question of how our planet was formed and, more generally, how a planetary system forms is fundamental and has been addressed in a broad range of research domains. However, we still lack a…
arxiv.org
Probing outflow physics through CH$_3$CN and CH$_3$OH chemistry Giani et al. arXiv arxiv.org/abs/2606.26827
Probing outflow physics through CH$_3$CN and CH$_3$OH chemistry
Chemical correlations between molecules provide powerful diagnostics to probe the physical conditions of protostellar outflows. In particular, the relationship between methanol (CH$_3$OH) and methyl…
arxiv.org
NO molecule in massive star forming regions Su et al. arXiv arxiv.org/abs/2606.26756
NO molecule in massive star forming regions
Context. Among diatomic molecules composed of the abundant elements C, N and O, NO has been detected far less than the well studied CN and CO, making it a crucial yet under-observed component in…
arxiv.org
Theoretical determination of the binding energies of methanol and related species onto amorphous solid water ice Ahmad et al. arXiv arxiv.org/abs/2606.26833
Theoretical determination of the binding energies of methanol and related species onto amorphous solid water ice
The formation and survival of complex organic molecules (COMs) in cold interstellar environments depends on their interactions with icy dust grain surfaces. Methanol, a key COM detected in cold cores…
arxiv.org
Optical constants of Ih, Ic, and amorphous H$_2$O ices in the THz and IR ranges Gavdush et al. arXiv arxiv.org/abs/2606.25661
Optical constants of Ih, Ic, and amorphous H$_2$O ices in the THz and IR ranges
Direct measurements of optical constants in the THz spectral region for astrophysically relevant H$_2$O ice samples are scarce. Extrapolation of optical properties in the THz spectral region from IR…
arxiv.org
Probing the ubiquity of complex ices in protostars with JWST: the first systematic quantification of weak ice bands between 6.8 and 7.9 micron Chen et al. arXiv (ApJL) arxiv.org/abs/2606.25500
Probing the ubiquity of complex ices in protostars with JWST: the first systematic quantification of weak ice bands between 6.8 and 7.9 micron
Complex organic molecules (COMs) are the key to understanding the chemical evolution from simple interstellar molecules to potential prebiotic material. Although COMs have been extensively studied in…
arxiv.org
MINDS: Complementary inclinations in the binary system HK Tau reveal gas- and ice-phase chemistry Somigliana et al. arXiv (A&A) arxiv.org/abs/2606.23794
MINDS: Complementary inclinations in the binary system HK Tau reveal gas- and ice-phase chemistry
[Abridged] HK Tau is a roughly equal mass pre-main sequence binary system consisting of a low-inclination primary (57 deg) and an edge-on (83 deg) secondary. We present JWST/MIRI observations…
arxiv.org
Charge transfer from ammonia neutralizes propylene oxide cations: Implications for the astrochemistry of chiral molecules Maheshwari et al. arXiv arxiv.org/abs/2606.23890
Charge transfer from ammonia neutralizes propylene oxide cations: Implications for the astrochemistry of chiral molecules
To date only one chiral species, propylene oxide, has been observed in the interstellar medium but little is known about the chemistry that leads to a detectable abundance of this molecule in…
arxiv.org
Implications of self-consistent H$_2$O ice optical constants on radiative transfer models of disks Smith et al. arXiv arxiv.org/abs/2606.21529
Implications of self-consistent H$_2$O ice optical constants on radiative transfer models of disks
Interstellar water (H$_2$O) ice exhibits significantly varied profiles over its spectral features with temperature and thermal history. No previous radiative transfer model of a protoplanetary disk…
arxiv.org
Complex organic molecules in the young hot core RCW 120 S2 Kirsanova et al. arXiv arxiv.org/abs/2606.21989
Complex organic molecules in the young hot core RCW 120 S2
We analyse physical and chemical structure of the hot molecular core RCW120 S2, based on high-sensitivity (2-4 mK) APEX observations at 1.3 mm. The analysis reveals a rich molecular inventory,…
arxiv.org
Reaction Mechanisms and Kinetics of CN and CCH with H2CS: Implications for Interstellar Sulfur Chemistry Kerkeni et al. arXiv arxiv.org/abs/2606.21730
Reaction Mechanisms and Kinetics of CN and CCH with H2CS: Implications for Interstellar Sulfur Chemistry
We report an ab initio and master-equation investigation of the gas-phase reactions of thioformaldehyde (H2CS) with CN and CCH radicals, motivated by the recent detection of the S-containing species…
arxiv.org
UCLCHEM 4.0: An open source gas-grain astrochemistry simulation framework Vermariën et al. arXiv arxiv.org/abs/2606.20265
UCLCHEM 4.0: An open source gas-grain astrochemistry simulation framework
Astrochemical modeling is a key tool for the understanding of the formation and destruction of molecules in the dense gas of the interstellar medium, as observed by modern day observational…
arxiv.org