Rotational Spectroscopy and Tentative Interstellar Detection of 3-hydroxypropanal (HOCH2CH2CHO) in the G+0.693-0.027 Molecular Cloud

The Astrophysical Journal Pub Date : 2025-10-13 DOI:10.3847/1538-4357/adfc62

Zachary T. P. Fried, Roman A. Motiyenko, Miguel Sanz-Novo, Lucie Kolesniková, Jean-Claude Guillemin, Laurent Margulès, Tereza Uhlíková, Arnaud Belloche, Jes K. Jørgensen, Martin S. Holdren, Ci Xue, Štěpán Urban, Izaskun Jiménez-Serra, Victor M. Rivilla and Brett A. McGuire

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Abstract

We synthesized the astrochemically relevant molecule 3-hydroxypropanal (HOCH2CH2CHO) and subsequently measured and analyzed its rotational spectrum in several frequency regions ranging from 130 to 485 GHz. We analyzed the ground vibrational state as well as the two perturbed lowest-lying vibrationally excited states. With the resulting rotational parameters, we searched for this molecule in the Sagittarius B2(N) and NGC 6334I hot cores, the IRAS 16293-2422B hot corino, and the G+0.693-0.027 and TMC-1 molecular clouds. Rotational emission of 3-hydroxypropanal was tentatively detected toward G+0.693-0.027, and a column density of (8.6 ±1.4) × 1012 cm−2 was determined. However, this molecule was not detected in the other sources that were investigated. The chemical implications of this tentative discovery are analyzed, and several potential chemical formation pathways of this species are discussed.

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G+0.693-0.027分子云中3-羟基丙烷（HOCH2CH2CHO）的旋转光谱和星际探测

我们合成了天体化学相关分子3-羟基丙烷（HOCH2CH2CHO），随后测量并分析了其在130 - 485 GHz几个频率区域的旋转光谱。我们分析了基态振动和两个扰动的最低振动激发态。利用得到的旋转参数，我们在人马座B2(N)和NGC 6334I热核、IRAS 16293-2422B热核、G+0.693-0.027和TMC-1分子云中搜索了该分子。在G+0.693-0.027范围内初步检测3-羟丙醛的旋转发射，测定柱密度为（8.6±1.4）× 1012 cm−2。然而，在研究的其他来源中未检测到该分子。分析了这一初步发现的化学意义，并讨论了该物种的几种可能的化学形成途径。

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The Astrophysical Journal

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