Publication details

TESS cycle 1 observations of roAp stars with 2-min cadence data

Authors	HOLDSWORTH D. L. CUNHA M. S. KURTZ D. W. ANTOCI V. HEY D. R. BOWMAN D. M. KOBZAR O. BUZASI D. L. KOCHUKHOV O. NIEMCZURA E. OZUYAR D. SHI F. SZABÓ R. SAMADI-GHADIM A. BOGNÁR Z. FOX-MACHADO L. KHALACK V. LARES-MARTIZ M. LOVEKIN C. C. MIKOLAJCZYK P. MIKOŁAJCZYK D. PASCUAL-GRANADO J. PAUNZEN Ernst RICHEY-YOWELL T. SÓDOR Ádám SIKORA J. YANG T. Z. BRUNSDEN E. DAVID-URAZ A. DEREKAS A. GARCÍA HERNÁNDEZ A. GUZIK J. A. HATAMKHANI N. HANDBERG R. LAMBERT T. S. LAMPENS P. MURPHY S. J. MONIER R. POLLARD K. R. QUITRAL-MANOSALVA P. RAMON-BALLESTA A. SMALLEY B. STATEVA I. VANDERSPEK R.
Year of publication	2021
Type	Article in Periodical
Magazine / Source	Monthly Notices of the Royal Astronomical Society
MU Faculty or unit	Faculty of Science
Citation
Web	https://academic.oup.com/mnras/article-abstract/506/1/1073/6289936
Doi	http://dx.doi.org/10.1093/mnras/stab1578
Keywords	asteroseismology; techniques: photometric; stars: chemically peculiar; stars: magnetic field; stars: oscillations; stars: variables
Description	We present the results of a systematic search for new rapidly oscillating Ap (roAp) stars using the 2-min cadence data collected by the Transiting Exoplanet Survey Satellite (TESS) during its Cycle?1 observations. We identify 12 new roAp stars. Amongst these stars we discover the roAp star with the longest pulsation period, another with the shortest rotation period, and six with multiperiodic variability. In addition to these new roAp stars, we present an analysis of 44 known roAp stars observed by TESS during Cycle?1, providing the first high-precision and homogeneous sample of a significant fraction of the known roAp stars. The TESS observations have shown that almost 60?per?cent (33) of our sample of stars are multiperiodic, providing excellent cases to test models of roAp pulsations, and from which the most rewarding asteroseismic results can be gleaned. We report four cases of the occurrence of rotationally split frequency multiplets that imply different mode geometries for the same degree modes in the same star. This provides a conundrum in applying the oblique pulsator model to the roAp stars. Finally, we report the discovery of non-linear mode interactions in ??Cir (TIC?402546736, HD?128898) around the harmonic of the principal mode – this is only the second case of such a phenomenon.