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The nearby red giant Aldebaran is known to host a gas giant planetarycompanion from decades of ground-based spectroscopic radial velocitymeasurements. Using Gaussian Process-based Continuous Auto-Regressive MovingAverage (CARMA) models, we show that these historic data also contain evidenceof acoustic oscillations in the star itself, and verify this result withfurther dedicated ground-based spectroscopy and space-based photometry with theKepler Space Telescope. From the frequency of these oscillations we determinethe mass of Aldebaran to be $1.16 \pm 0.07 \, M_\odot$, and note that thisimplies its planet will have been subject to insolation comparable to the Earthfor some of the star's main sequence lifetime. Our approach to sparse,irregularly sampled time series astronomical observations has the potential tounlock asteroseismic measurements for thousands of stars in archival data, andpush to lower-mass planets around red giant stars.

Aldebaran b's temperate past uncovered in planet search data