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We report the serendipitous detection with ALMA of the vibrationally-excitedpure-rotational CO transition $v=1, J=3-2$ towards five asymptotic giant branch(AGB) stars, $o$ Cet, R Aqr, R Scl, W Aql, and $\pi^1$ Gru. The observed linesare formed in the poorly-understood region located between the stellar surfaceand the region where the wind starts, the so-called warm molecular layer. Wesuccessfully reproduce the observed lines profiles using a simple model. Weconstrain the extents, densities, and kinematics of the region where the linesare produced. R Aqr and R Scl show inverse P-Cygni line profiles which indicateinfall of material onto the stars. The line profiles of $o$ Cet and R Scl showvariability. The serendipitous detection towards these five sources shows thatvibrationally-excited rotational lines can be observed towards a large numberof nearby AGB stars using ALMA. This opens a new possibility for the study ofthe innermost regions of AGB circumstellar envelopes.

ALMA observations of the vibrationally-excited rotational CO transition $v=1, J=3-2$ towards five AGB stars