TESS photometry of the eclipsing δ Scuti star Al Hydrae

Al Hya has been known as an eclipsing binary with a monoperiodic delta Sct pulsator. We present the results from its TESS (Transiting Exoplanet Survey Satellite) photometry observed during Sector 7. Including our five minimum epochs, the eclipse timing diagram displays the apsidal motion with a rate of (omega) over dot = 0.075 +/- 0.031 deg yr(-1), which corresponds to an apsidal period of U = 4800 +/- 2000 yr. The binary star model represents that the smaller, less massive primary component is 427 K hotter than the pulsating secondary, and our distance of 612 +/- 36 pc is in good agreement with the Gaia distance of 644 +/- 26 pc. We subtracted the binary effects from the observed TESS data and applied a multifrequency analysis to these residuals. The result reveals that Al Hya is multiperiodic in its pulsation. Of 14 signals detected, four (f(1), f(2), f(3), f(6)) may be considered independent pulsation frequencies. The period ratios of P-pul/P-orb = 0.012-0.021 and the pulsation constants of Q = 0.30-0.52 d correspond to delta Sct pulsations in binaries. We found that the secondary component of Al Hya pulsates in both radial fundamental F modes (f(2) and f(3)) and non-radial g(1) modes with a low degree of l = 2 (f(1) and f(6)).