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Lookup NU author(s): Dr Dominic BowmanORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Author(s) 2023.We present the results of a systematic search of the Transiting Exoplanet Survey Satellite (TESS) 2-min cadence data for new rapidly oscillating Ap (roAp) stars observed during the Cycle 2 phase of its mission. We find seven new roAp stars previously unreported as such and present the analysis of a further 25 roAp stars that are already known. Three of the new stars show multiperiodic pulsations, while all new members are rotationally variable stars, leading to almost 70 per cent (22) of the roAp stars presented being α2 CVn-type variable stars. We show that targeted observations of known chemically peculiar stars are likely to overlook many new roAp stars, and demonstrate that multiepoch observations are necessary to see pulsational behaviour changes. We find a lack of roAp stars close to the blue edge of the theoretical roAp instability strip, and reaffirm that mode instability is observed more frequently with precise, space-based observations. In addition to the Cycle 2 observations, we analyse TESS data for all-known roAp stars. This amounts to 18 further roAp stars observed by TESS. Finally, we list six known roAp stars that TESS is yet to observe. We deduce that the incidence of roAp stars amongst the Ap star population is just 5.5 per cent, raising fundamental questions about the conditions required to excite pulsations in Ap stars. This work, coupled with our previous work on roAp stars in Cycle 1 observations, presents the most comprehensive, homogeneous study of the roAp stars in the TESS nominal mission, with a collection of 112 confirmed roAp stars in total.
Author(s): Holdsworth DL, Cunha MS, Lares-Martiz M, Kurtz DW, Antoci V, Barcelo Forteza S, De Cat P, Derekas A, Kayhan C, Ozuyar D, Skarka M, Hey DR, Shi F, Bowman DM, Kobzar O, Ayala Gomez A, Bognar Zs, Buzasi DL, Ebadi M, Fox-Machado L, Garcia Hernandez A, Ghasemi H, Guzik JA, Handberg R, Handler G, Hasanzadeh A, Jayaraman R, Khalack V, Kochukhov O, Lovekin CC, Mikolajczyk P, Mkrtichian D, Murphy SJ, Niemczura E, Olafsson BG, Pascual-Granado J, Paunzen E, Posilek N, Ramon-Ballesta A, Safari H, Samadi-Ghadim A, Smalley B, Sodor A, Stateva I, Suarez JC, Szabo R, Wu T, Ziaali E, Zong W, Seager S
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Year: 2024
Volume: 527
Issue: 4
Pages: 9548-9580
Print publication date: 01/01/2024
Online publication date: 08/12/2023
Acceptance date: 07/12/2023
Date deposited: 23/01/2024
ISSN (print): 0035-8711
ISSN (electronic): 1365-2966
Publisher: Oxford University Press
URL: https://doi.org/10.1093/mnras/stad3800
DOI: 10.1093/mnras/stad3800
Data Access Statement: All photometric data used in this work are available to download from the MAST server [ https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html]. LAMOST data are available to download from the LAMOST data archive [ http://www.lamost.org/dr9/]. HERMES data are available on reasonable request from the authors.
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