ATOMIUM: Inner circumstellar envelopes of oxygen-rich AGB stars as revealed by highly excited SiO lines
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ID: 313950
2026
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Abstract
Abstract Silicon monoxide (SiO) traces the physical conditions and dynamics in the circumstellar envelopes (CSEs) of AGB stars. We present high-resolution ALMA Band 6 observations of highly excited SiO emission in 14 oxygen-rich AGB stars. We cover transitions from υ = 0 to υ = 8, including first detections of 28SiO υ = 3, 4, 8, J = 6 − 5, 29SiO υ = 6, J = 6 − 5, and 30SiO υ = 4, 5, J = 6 − 5, some of which are masers. The υ = 8 transition is the highest υ-state observed in an AGB star yet. Masers in υ = 0 are detected clearly in V PsA and IRC+10011 and tentatively in T Mic. R Hya exhibits the richest SiO spectrum. SiO J = 6 − 5 absorption is seen in R Aql, R Hya, S Pav, and T Mic, with features indicative of both infalls and outflows, and tentative detection of 28SiO υ = 8, J = 6 − 5 absorption is found towards S Pav and R Aql. Highly excited SiO emission is often distributed in arcs or clumps with velocity gradients; components in R Hya and U Her align with predicted shock fronts. Detection rates show no significant difference between low and high mass-loss rate stars, although line overlap may affect some intensities. Maser detections appear uncorrelated with pulsation period or phase. The radius enclosing 90 per cent of compact SiO emission shows a tentative correlation with mass-loss rate. These results highlight the role of mass loss and CSE geometry in shaping high-excitation SiO emission.
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| Authors | B Pimpanuwat, S Etoka, M D Gray, A M S Richards, A Baudry, F Herpin, T Danilovich, L Decin, M O Lewis, I El Mellah, C A Gottlieb, Y Mori, H S P Müller, R Sahai, K T Wong, J A Yates, A Zijlstra |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag888
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| URL | |
| Keywords | Keywords not found |
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