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arxiv: 2606.27184 · v1 · pith:JM7BCD2Rnew · submitted 2026-06-25 · 🌌 astro-ph.SR · astro-ph.GA

Chemical Complexity in the Early Stages of Star Formation in the SKAO Era

Eleonora Bianchi , Mathilde Bouvier , Claudio Codella , Laura Colzi , Audrey Coutens , Marta De Simone , Joan Enrique Romero , Gisela Esplugues
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Francesco Fontani Antonio Garufi Lisa Giani Arshia Maria Jacob Izaskun Jim\'enez-Serra Marco Padovani Linda Podio Albert Rimola Pablo Rivi\`ere Marichalar Giovanni Sabatini Andrea Socci Riccardo Giovanni Urso Tyler L. Bourke Gemma Busquet Paola Caselli Cecilia Ceccarelli Tomoya Hirota John D. Ilee Valerio Lattanzi Manuela Lippi Ana L\'opez-Sepulcre Pierre Marchand Liton Majumdar Sabyasachi Pal Maria Elisabetta Palumbo Jaime E. Pineda Manoj Puravankara Elena Redaelli Victor M. Rivilla Basmah Riaz \'Alvaro S\'anchez-Monge Silvia Spezzano Leonardo Testi Himanshu Tyagi Claudia Toci Alessio Traficante Grazia Umana Charlotte Vastel Susanne Wampfler
This is my paper

Pith reviewed 2026-06-26 03:23 UTC · model grok-4.3

classification 🌌 astro-ph.SR astro-ph.GA
keywords astrochemistrystar formationprebiotic moleculesSKAOradio observationsprotostellar regionschemical complexityinterstellar medium
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The pith

The SKAO will detect prebiotic molecules hidden by dust in the earliest stages of star formation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that roughly 350 molecules have been found in the interstellar medium, with complex prebiotic ones appearing from the first phases of star formation, yet current radio instruments cannot access many of them in dense protostellar cores because dust blocks the signal and large molecules emit at frequencies outside existing coverage. It claims the SKAO, especially SKA-Mid with Band 5 receivers, will supply the missing sensitivity and angular resolution at radio wavelengths to observe these species directly. A sympathetic reader would care because the detected molecules form the chemical starting material that planetary systems inherit. The chapter outlines the specific questions this capability will address in both high-mass and solar-type regions.

Core claim

The Square Kilometre Array Observatory will provide an unprecedented combination of sensitivity and angular resolution at radio wavelengths. This will allow detection of prebiotic species such as formamide, glycolaldehyde, urea, and hydroxylamine, which remain inaccessible today, and will deliver new insights into the chemical pathways that shape emerging planetary systems.

What carries the argument

SKAO radio-wavelength sensitivity and angular resolution with Band 5 receivers, which target lower-frequency transitions of large molecules in regions where dust opacity blocks shorter wavelengths.

If this is right

  • Prebiotic molecules currently blocked by dust opacity will become detectable in dense protostellar regions.
  • Chemical diversity present from the earliest stages of star formation will be mapped in detail.
  • The initial chemical inventory passed to planetary systems will be traced through specific molecular pathways.
  • Both high-mass and solar-type star-forming regions will yield comparable data on these processes.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the detections succeed, they could guide searches for the same molecules in disks around young stars to test inheritance.
  • The data might connect early interstellar chemistry to the organic content observed in comets or meteorites.

Load-bearing premise

The final SKA-Mid Band 5 receivers will reach the needed sensitivity and frequency coverage, and the targeted prebiotic molecules will exist at detectable abundances and excitation conditions in the dense regions.

What would settle it

SKAO observations of protostellar regions that achieve the expected sensitivity but still fail to detect the predicted prebiotic species at any abundance would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.27184 by Albert Rimola, Alessio Traficante, \'Alvaro S\'anchez-Monge, Ana L\'opez-Sepulcre, Andrea Socci, Antonio Garufi, Arshia Maria Jacob, Audrey Coutens, Basmah Riaz, Cecilia Ceccarelli, Charlotte Vastel, Claudia Toci, Claudio Codella, Elena Redaelli, Eleonora Bianchi, Francesco Fontani, Gemma Busquet, Giovanni Sabatini, Gisela Esplugues, Grazia Umana, Himanshu Tyagi, Izaskun Jim\'enez-Serra, Jaime E. Pineda, Joan Enrique Romero, John D. Ilee, Laura Colzi, Leonardo Testi, Linda Podio, Lisa Giani, Liton Majumdar, Manoj Puravankara, Manuela Lippi, Marco Padovani, Maria Elisabetta Palumbo, Marta De Simone, Mathilde Bouvier, Pablo Rivi\`ere Marichalar, Paola Caselli, Pierre Marchand, Riccardo Giovanni Urso, Sabyasachi Pal, Silvia Spezzano, Susanne Wampfler, Tomoya Hirota, Tyler L. Bourke, Valerio Lattanzi, Victor M. Rivilla.

Figure 1
Figure 1. Figure 1: Molecules per year based on the database1 by Mitsunori Araki, Max-Planck-Institut für extrater￾restrische Physik. Figure adapted and updated from McGuire (2022). A low-mass, solar-type protostar and its planetary system form when a cold (≲ 10 K) and dense (> 104 cm−3 ) core starts to collapse under its gravity (e.g., Stahler and Palla, 2004). During the gravitational collapse, the material accretes asymmet… view at source ↗
Figure 2
Figure 2. Figure 2: IRAS4A at mm (left, ALMA 1.2 mm continuum and CH3OCH3 emission as representative for all iCOMs) and cm (right, VLA CH3OH emission) wavelengths. The optically thick mm dust obscures the 4A1 hot corino that pops up in the cm and absorbs part of the emission lines in 4A2 (De Simone et al., 2020). The PErseus Alma CHEmistry Survey (PEACHES, Yang et al., 2021) and the ORion Alma New GEneration Survey (ORANGES, … view at source ↗
Figure 3
Figure 3. Figure 3: Full spectra (in main-beam temperature, TMB) of the L1544 prestellar core observed with GBT between 7.8 and 15.41 GHz, corresponding to the future SKA-Mid Band 5. The labels denote the brightest lines associated with the detected species (adapted from Giani et al. 2025b). 6 8 10 12 14 Frequency [GHz] 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 T[K] 10h HC5N HC7N HC9N HC11N 6 8 10 12 14 Frequency [GHz] 0.0… view at source ↗
Figure 4
Figure 4. Figure 4: Predicted line intensities of cyanopolyynes (HC5N, HC7N, HC9N, HC11N), polyynyl radicals (C4H, C6H, C8H) and benzonitrile (c-C6H5CN) in prestellar cores. The predictions are obtained assuming local thermodynamic equilibrium (LTE), optically thin lines, kinetic temperature (Tkin) of 8 K, lines full width at half maximum (FWHM) of 0.3 km s−1 , and extended emission. We assume the following column densities f… view at source ↗
Figure 5
Figure 5. Figure 5: Left panel: An accretion streamer detected in HC5N towards the Class 0 young protostar Per-emb￾2. Figure adapted from Taniguchi et al. (2024b). Right panel: Predicted line intensities of cyanopolyynes (HC3N, HC5N, HC7N, HC9N), and polyynyl radicals (C4H, C6H) in protostellar envelopes. The predictions are obtained assuming LTE, optically thin lines, kinetic temperature Tkin=20 K, line FWHMs=1 km s−1 , and … view at source ↗
Figure 6
Figure 6. Figure 6: The central panel (Panel a) shows the continuum emission at 3.3 mm of the star-forming filament OMC-2/3, as observed from the MUSTANG camera on the GBT (Mason et al., 2020). The SKA-Mid field of view (FoV) at 8 GHz (dashed blue circle) and 15 GHz (solid blue circle) is shown centered on the FIR4 protocluster, which is highlighted by the green square. Cyan markers indicate the sources observed by the ORANGE… view at source ↗
Figure 7
Figure 7. Figure 7: LTE simulated spectra for HC7N rotational transitions that will be covered with SKA Mid 5b. The parameters used are 𝑁= 3×1011 cm−2 𝑇ex = 11 K and FWHM = 2 km s−1 . The green and purple horizontal lines represent the 3 rms limit for a total observing time of 800 h and 300 h, respectively. See the text for more information. CHEMical complexity in star-forming regions of the OUTer Galaxy, considering a sample… view at source ↗
read the original abstract

About 350 molecules have been identified in the interstellar medium (ISM), including complex molecules relevant to prebiotic chemistry. A remarkable level of molecular diversity has been observed from the earliest stages of star formation, providing the initial chemical inventory inherited by planetary systems. Radio observations have played a pivotal role in these discoveries, starting with the identification of the first polyatomic molecule, $\text{NH}_3$ (Cheung et al. 1968). (Sub-)millimeter observations have revealed complex organic molecules of prebiotic relevance, including formamide ($\text{NH}_2\text{CHO}$), glycolaldehyde ($\text{CH}_2\text{OHCHO}$), and even urea ($(\text{NH}_2)_2\text{CO}$), and hydroxylamine ($\text{NH}_2\text{OH}$), which are possible precursors of RNA nucleotides (Ceccarelli et al. 2023; Jim\'enez-Serra et al. 2020). However, in dense protostellar regions, dust opacity hampers the detection of molecular emission. Additionally, large molecules and those containing heavy atoms, which have rotational transitions at lower frequencies, often remain inaccessible to current instruments. The Square Kilometre Array Observatory (SKAO) will provide an unprecedented combination of sensitivity and angular resolution at radio wavelengths. This will allow for the detection of prebiotic species and offer new insights into the chemical pathways that shape emerging planetary systems (Jim\'enez-Serra et al. 2022). This chapter details the scientific questions and advancements that the SKAO, and more specifically, SKA-Mid equipped with the Band 5 receivers, will pursue in the field of astrochemistry, focusing on the chemical complexity in both high-mass and solar-type star-forming regions.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript reviews the detection of ~350 molecules in the ISM, including prebiotic species such as formamide, glycolaldehyde, urea, and hydroxylamine, and argues that current limitations from dust opacity in dense protostellar regions and limited access to low-frequency transitions of large/heavy molecules will be overcome by the SKAO, particularly SKA-Mid Band 5, enabling new detections and insights into chemical pathways inherited by planetary systems.

Significance. If the projected SKA-Mid Band 5 performance is realized, the paper usefully synthesizes existing literature on astrochemistry and identifies specific open questions in high-mass and solar-type star formation that could be addressed with the new instrument's sensitivity and resolution at radio wavelengths.

major comments (2)
  1. [Abstract] Abstract: the claim that SKA-Mid Band 5 'will allow for the detection of prebiotic species' is load-bearing for the central argument but rests on the unverified assumptions that final receiver sensitivity/frequency coverage will be achieved and that target molecules will be present at detectable column densities/excitation temperatures in dust-obscured regions; no quantitative sensitivity calculations or abundance estimates are provided or derived in the manuscript to support this.
  2. [SKAO capabilities discussion] The section on SKAO capabilities: the assertion that SKAO overcomes dust opacity and accesses low-frequency transitions of species such as (NH2)2CO and NH2OH is presented without a direct comparison to existing instrument performance metrics or cited SKAO technical specifications that would demonstrate the improvement is sufficient for the cited molecules.
minor comments (1)
  1. The manuscript refers to itself as 'this chapter'; clarify whether it is intended as a standalone article or book chapter for the target journal.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments. We address the two major comments point-by-point below and will revise the manuscript to incorporate quantitative context and comparisons as outlined.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the claim that SKA-Mid Band 5 'will allow for the detection of prebiotic species' is load-bearing for the central argument but rests on the unverified assumptions that final receiver sensitivity/frequency coverage will be achieved and that target molecules will be present at detectable column densities/excitation temperatures in dust-obscured regions; no quantitative sensitivity calculations or abundance estimates are provided or derived in the manuscript to support this.

    Authors: We agree that the abstract claim would be strengthened by additional quantitative support. The manuscript is a review chapter synthesizing existing literature rather than presenting new calculations; however, we will revise both the abstract and the main text to include order-of-magnitude sensitivity estimates and references to published SKAO performance studies and typical molecular abundances in high-mass and solar-type protostellar regions (e.g., from Ceccarelli et al. 2023 and related works). We will also qualify the language to note that detections assume design goals are met. revision: yes

  2. Referee: [SKAO capabilities discussion] The section on SKAO capabilities: the assertion that SKAO overcomes dust opacity and accesses low-frequency transitions of species such as (NH2)2CO and NH2OH is presented without a direct comparison to existing instrument performance metrics or cited SKAO technical specifications that would demonstrate the improvement is sufficient for the cited molecules.

    Authors: We accept this point. The current text relies on cited references for SKAO capabilities, but a direct comparison will improve clarity. We will revise the SKAO capabilities section to add explicit comparisons of sensitivity, frequency coverage, and resolution between SKA-Mid Band 5 and facilities such as ALMA and the VLA, citing official SKAO technical specifications and performance documents to show the advantages for low-frequency transitions of species like urea and hydroxylamine. revision: yes

Circularity Check

0 steps flagged

No significant circularity; paper is a review without derivations or self-referential predictions.

full rationale

The manuscript contains no equations, quantitative predictions, or derivation chains. Central claims about SKAO/SKA-Mid Band 5 capabilities rest on external citations (e.g., Jiménez-Serra et al. 2022) for instrument projections and prior detections, rather than reducing to self-defined inputs or fitted parameters renamed as predictions. Overlap in authorship with cited works exists but does not create load-bearing circularity, as the argument is forward-looking and externally falsifiable via instrument performance data. This is a standard non-finding for perspective/review papers.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is a review paper with no new models, derivations, or quantitative fits. No free parameters, axioms, or invented entities are introduced.

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