Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2. (arXiv:1906.01111v1 [astro-ph.SR])

Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2. (arXiv:1906.01111v1 [astro-ph.SR])
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We present the first results from the Transiting Exoplanet Survey Satellite
(TESS) on the rotational and pulsational variability of magnetic chemically
peculiar A-type stars. We analyse TESS 2-min cadence data from sectors 1 and 2
on a sample of 83 stars. Five new rapidly oscillating Ap (roAp) stars are
announced. One of these pulsates with periods around 4.7 min, making it the
shortest period roAp star known to date. Four out of the five new roAp stars
are multiperiodic. Three of these, and the singly-periodic one show the
presence of rotational mode splitting. Individual frequencies are provided in
all cases. In addition, seven previously known roAp stars are analysed.
Additional modes of oscillation are found in some stars, while in others we are
able to distinguish the true pulsations from possible aliases present in the
ground-based data. We find that the pulsation amplitude in the TESS filter is
typically a factor 6 smaller than that in the $B$ filter which is usually used
for ground-based observations. For four roAp stars we set constraints on the
inclination angle and magnetic obliquity, through the application of the
oblique pulsator model. We also confirm the absence of roAp-type pulsations
down to amplitude limits of 6 and 13 micromag, respectively, in two of the best
characterised non-oscillating Ap (noAp) stars. We announce 27 new rotational
variables along with their rotation periods, and provide different rotation
periods for seven other stars. Finally, we discuss how these results challenge
state-of-the-art pulsation models for roAp stars.

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