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

Holdsworth, D. L. and Cunha, M. S. and Kurtz, D. W. and Antoci, V. and Hey, D. R. and Bowman, D. M. and Kobzar, O. and Buzasi, D. L. and Kochukhov, O. and Niemczura, E. and Ozuyar, D. and Shi, F. and Szabo, R. and Samadi-Ghadim, A. and Bognar, Zs and Fox-Machado, L. and Khalack, V. and Lares-Martiz, M. and Lovekin, C. C. and Mikolajczyk, P. and Mkrtichian, D. and Pascual-Granado, J. and Paunzen, E. and Richey-Yowell, T. and Sodor, Á and Sikora, J. and Yang, T. Z. and Brunsden, E. and David-Uraz, A. and Derekas, A. and Garcia Hernandez, A. and Guzik, J. A. and Hatamkhani, N. and Handberg, R. and Lambert, T. S. and Lampens, P. and Murphy, S. J. and Monier, R. and Pollard, K. R. and Quitral-Manosalva, P. and Ramon-Ballesta, A. and Smalley, B. and Stateva, I. and Vanderspek, R. (2021) TESS cycle 1 observations of roAp stars with 2-min cadence data. Monthly Notices of the Royal Astronomical Society, 506 (1). pp. 1073-1110. ISSN 0035-8711

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Abstract

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 α Cir (TIC 402546736, HD 128898) around the harmonic of the principal mode – this is only the second case of such a phenomenon.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 13 Jul 2022 06:00
Last Modified: 15 Aug 2022 03:39
Uncontrolled Keywords: asteroseismology; stars: chemically peculiar; stars: magnetic field; stars: oscillations; stars: variables; techniques: photometric; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stab1578
URI: http://eprints.usq.edu.au/id/eprint/47888

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