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Calcium monohydroxide radical (CaOH) is receiving an increasing amount ofattention from the astrophysics community as it is expected to be present inthe atmospheres of hot rocky super-Earth exoplanets as well as interstellar andcircumstellar environments. Here, we report the high-resolution laboratoryabsorption spectroscopy on low-$J$ transitions in$\tilde{A}^2\Pi(0,0,0)-\tilde{X}^2\Sigma^+(0,0,0)$ band of buffer-gas-cooledCaOH. In total, 40 transitions out of the low-$J$ states were assigned,including 27 transitions which have not been reported in previous literature.The determined rotational constants for both ground and excited states are inexcellent agreement with previous literature, and the measurement uncertaintyfor the absolute transition frequencies was improved by more than a factor ofthree. This will aid future interstellar, circumstellar, and atmosphericidentifications of CaOH. The buffer-gas-cooling method employed here is aparticularly powerful method to probe low-$J$ transitions and is easilyapplicable to other astrophysical molecules.

Low-$J$ transitions in $\tilde{A}^2\Pi(0,0,0)-\tilde{X}^2\Sigma^+(0,0,0)$ band of buffer-gas-cooled CaOH