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

Journal Article · 31 May 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab1578 · OSTI ID:1807727

Holdsworth, D. L.  ^[1]; Cunha, M. S. ^[2]; Kurtz, D. W.  ^[3]; Antoci, V. ^[4]; Hey, D. R. ^[5]; Bowman, D. M.  ^[6]; Kobzar, O. ^[7]; Buzasi, D. L. ^[8]; Kochukhov, O.  ^[9]; Niemczura, E. ^[10]; Ozuyar, D. ^[11]; Shi, F.  ^[12]; Szabó, R. ^[13]; Samadi-Ghadim, A. ^[14]; Bognár, Zs ^[13]; Fox-Machado, L. ^[15]; Khalack, V. ^[7]; Lares-Martiz, M.  ^[16]; Lovekin, C. C. ^[17]; Mikołajczyk, P. ^[10] ; Mkrtichian, D. ^[18]; Pascual-Granado, J.  ^[16]; Paunzen, E.  ^[19]; Richey-Yowell, T. ^[20]; Sódor, Á. ^[21]; Sikora, J. ^[22]; Yang, T. Z. ^[23]; Brunsden, E. ^[24]; David-Uraz, A.  ^[25]; Derekas, A. ^[26]; García Hernández, A. ^[27]; Guzik, J. A. ^[28]; Hatamkhani, N. ^[29]; Handberg, R.  ^[30]; Lambert, T. S.  ^[31]; Lampens, P. ^[32]; Murphy, S. J.  ^[5]; Monier, R. ^[33]; Pollard, K. R. ^[34]; Quitral-Manosalva, P. ^[35]; Ramón-Ballesta, A. ^[16]; Smalley, B.  ^[36]; Stateva, I. ^[37]; Vanderspek, R. ^[38]

---

1. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
2. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto CAUP, Rua das Estrelas, P-PT4150-762 Porto, Portugal
3. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK, Centre for Space Research, Physics Department, North West University, Mahikeng 2745, South Africa
4. DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 328, DK-2800 Kgs. Lyngby, Denmark, Stellar Astrophysics Centre, Aarhus University, DK-8000 Aarhus C, Denmark
5. Stellar Astrophysics Centre, Aarhus University, DK-8000 Aarhus C, Denmark, School of Physics, Sydney Institute for Astronomy (SIfA), The University of Sydney, NSW 2006, Australia
6. Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
7. Département de Physique et d’Astronomie, Université de Moncton, 18 avenue Antonine-Maillet, Moncton, NB E1A 3E9, Canada
8. Department of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Blvd. S., Fort Myers, FL 33965 USA
9. Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
10. Astronomical Institute of University of Wrocław, ul. Kopernika 11, PL-51-622 Wrocław, Poland
11. Ankara University, Faculty of Science, Department of Astronomy and Space Sciences, 06100 Tandogan - Ankara / Turkey
12. Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China, Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
13. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, ELKH, H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary, MTA CSFK Lendület Near-Field Cosmology Research Group, Konkoly Thege Miklós út 15-17 1121 Budapest Hungary, ELTE Eötvös Loránd University, Institute of Physics, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
14. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany, Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile
15. Instituto de Astronomía–Universidad Nacional Autónoma de México, Ap. P. 877, Ensenada, BC 22860, Mexico
16. Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, Spain
17. Physics Department, Mount Allison University, Sackville, NB E4L1E6, Canada
18. National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand
19. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
20. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85281, USA
21. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, ELKH, H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary, MTA CSFK Lendület Near-Field Cosmology Research Group, Konkoly Thege Miklós út 15-17 1121 Budapest Hungary
22. Physics and Astronomy Department, Bishop’s University, 2600 College Street, Sherbrooke, QC J1M 1Z7, Canada
23. School of Physics, Xi’an Jiaotong University, 710049 Xi’an, People’s Republic of China
24. Department of Physics, University of York, Heslington, York YO10 5DD, UK, School of Physical and Chemical Sciences, Te Kura Matū, University of Canterbury, Christchurch 8020, New Zealand
25. Department of Physics and Astronomy, Howard University, Washington, DC 20059, USA, Center for Research and Exploration in Space Science and Technology, and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA
26. ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, 9700 Szombathely, Hungary, MTA-ELTE Exoplanet Research Group, 9700 Szombathely, Szent Imre h. u. 112, Hungary
27. Dept. Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, E-18071 Granada, Spain
28. Los Alamos National Laboratory, MS T-082, Los Alamos, NM 87545, USA
29. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
30. Stellar Astrophysics Centre, Aarhus University, DK-8000 Aarhus C, Denmark
31. Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile
32. Koninklijke Sterrenwacht van België, Ringlaan 3, B-1180 Brussel, Belgium
33. LESIA, UMR 8109, Observatoire de Paris et Université Pierre et Marie Curie Sorbonne Universités, place J. Janssen, 92195 Meudon, France
34. School of Physical and Chemical Sciences, Te Kura Matū, University of Canterbury, Christchurch 8020, New Zealand
35. Departamento de Física, Universidad Técnica Federico Santa María, Avda. España 1680, Valparaíso, Chile
36. Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
37. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, blvd. Tsarigradsko chaussee 72, Sofia 1784, Bulgaria
38. Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

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.

• Sponsoring Organization: USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain
• OSTI ID: 1807727
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 506; ISSN 0035-8711
• Publisher: Oxford University PressCopyright Statement
• Country of Publication: United Kingdom
• Language: English