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

D. L. Holdsworth; M. S. Cunha; D. W. Kurtz; V. Antoci; D. R. Hey; D. M. Bowman; O Kobzar; D. L. Buzasi; O. Kochukhov; E. Niemczura; D. Ozuyar; F. Shi; R. Szabó; A. Samadi-Ghadim; Zs. Bognár; L. Fox-Machado; V. Khalack; M. Lares-Martiz; C C Lovekin; P Mikołajczyk; D. Mkrtichian; J. Pascual-Granado; E. Paunzen; T. Richey-Yowell; Á. Sódor; J. Sikora; T. Z. Yang; E. Brunsden; A. David-Uraz; A. Derekas; A. García Hernández; J. A. Guzik; N. Hatamkhani; R. Handberg; T. S. Lambert; P. Lampens; S. J. Murphy; R. Monier; K R Pollard; P. Quitral-Manosalva; A. Ramón-Ballesta; B Smalley; I. Stateva; R Vanderspek

doi:10.1093/mnras/stab1578

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

D. L. Holdsworth^*, M. S. Cunha, D. W. Kurtz, V. Antoci, D. R. Hey, D. M. Bowman, O Kobzar, D. L. Buzasi, O. Kochukhov, E. Niemczura, D. Ozuyar, F. Shi, R. Szabó, A. Samadi-Ghadim, Zs. Bognár, L. Fox-Machado, V. Khalack, M. Lares-Martiz, C C Lovekin, P MikołajczykD. Mkrtichian, J. Pascual-Granado, E. Paunzen, T. Richey-Yowell, Á. Sódor, J. Sikora, T. Z. Yang, E. Brunsden, A. David-Uraz, A. Derekas, A. García Hernández, J. A. Guzik, N. Hatamkhani, R. Handberg, T. S. Lambert, P. Lampens, S. J. Murphy, R. Monier, K R Pollard, P. Quitral-Manosalva, A. Ramón-Ballesta, B Smalley, I. Stateva, R Vanderspek

^*Corresponding author for this work

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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.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	506
Pages (from-to)	1073–1110
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stab1578
Publication status	Published - 2021

Keywords

Asteroseismology
Stars: chemically peculiar
Stars: oscillations
Techniques: photometric
Stars: variables
Stars: magnetic fields

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10.1093/mnras/stab1578

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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., ... Vanderspek, R. (2021). TESS Cycle 1 observations of roAp stars with 2-min cadence data. Monthly Notices of the Royal Astronomical Society, 506, 1073–1110. https://doi.org/10.1093/mnras/stab1578

@article{e88309612c8241a689c9dc980344a055,

title = "TESS Cycle 1 observations of roAp stars with 2-min cadence data",

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.",

keywords = "Asteroseismology, Stars: chemically peculiar, Stars: oscillations, Techniques: photometric, Stars: variables, Stars: magnetic fields",

author = "Holdsworth, {D. L.} and Cunha, {M. S.} and Kurtz, {D. W.} and V. Antoci and Hey, {D. R.} and Bowman, {D. M.} and O Kobzar and Buzasi, {D. L.} and O. Kochukhov and E. Niemczura and D. Ozuyar and F. Shi and R. Szab{\'o} and A. Samadi-Ghadim and Zs. Bogn{\'a}r and L. Fox-Machado and V. Khalack and M. Lares-Martiz and Lovekin, {C C} and P Miko{\l}ajczyk and D. Mkrtichian and J. Pascual-Granado and E. Paunzen and T. Richey-Yowell and {\'A}. S{\'o}dor and J. Sikora and Yang, {T. Z.} and E. Brunsden and A. David-Uraz and A. Derekas and Hern{\'a}ndez, {A. Garc{\'i}a} and Guzik, {J. A.} and N. Hatamkhani and R. Handberg and Lambert, {T. S.} and P. Lampens and Murphy, {S. J.} and R. Monier and Pollard, {K R} and P. Quitral-Manosalva and A. Ram{\'o}n-Ballesta and B Smalley and I. Stateva and R Vanderspek",

year = "2021",

doi = "10.1093/mnras/stab1578",

language = "English",

volume = "506",

pages = "1073–1110",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

}

Holdsworth, DL, Cunha, MS, Kurtz, DW, Antoci, V, Hey, DR, Bowman, DM, Kobzar, O, Buzasi, DL, Kochukhov, O, Niemczura, E, Ozuyar, D, Shi, F, Szabó, R, Samadi-Ghadim, A, Bognár, Z, Fox-Machado, L, Khalack, V, Lares-Martiz, M, Lovekin, CC, Mikołajczyk, P, Mkrtichian, D, Pascual-Granado, J, Paunzen, E, Richey-Yowell, T, Sódor, Á, Sikora, J, Yang, TZ, Brunsden, E, David-Uraz, A, Derekas, A, Hernández, AG, Guzik, JA, Hatamkhani, N, Handberg, R, Lambert, TS, Lampens, P, Murphy, SJ, Monier, R, Pollard, KR, Quitral-Manosalva, P, Ramón-Ballesta, A, Smalley, B, Stateva, I & Vanderspek, R 2021, 'TESS Cycle 1 observations of roAp stars with 2-min cadence data', Monthly Notices of the Royal Astronomical Society, vol. 506, pp. 1073–1110. https://doi.org/10.1093/mnras/stab1578

TY - JOUR

T1 - TESS Cycle 1 observations of roAp stars with 2-min cadence data

AU - Holdsworth, D. L.

AU - Cunha, M. S.

AU - Kurtz, D. W.

AU - Antoci, V.

AU - Hey, D. R.

AU - Bowman, D. M.

AU - Kobzar, O

AU - Buzasi, D. L.

AU - Kochukhov, O.

AU - Niemczura, E.

AU - Ozuyar, D.

AU - Shi, F.

AU - Szabó, R.

AU - Samadi-Ghadim, A.

AU - Bognár, Zs.

AU - Fox-Machado, L.

AU - Khalack, V.

AU - Lares-Martiz, M.

AU - Lovekin, C C

AU - Mikołajczyk, P

AU - Mkrtichian, D.

AU - Pascual-Granado, J.

AU - Paunzen, E.

AU - Richey-Yowell, T.

AU - Sódor, Á.

AU - Sikora, J.

AU - Yang, T. Z.

AU - Brunsden, E.

AU - David-Uraz, A.

AU - Derekas, A.

AU - Hernández, A. García

AU - Guzik, J. A.

AU - Hatamkhani, N.

AU - Handberg, R.

AU - Lambert, T. S.

AU - Lampens, P.

AU - Murphy, S. J.

AU - Monier, R.

AU - Pollard, K R

AU - Quitral-Manosalva, P.

AU - Ramón-Ballesta, A.

AU - Smalley, B

AU - Stateva, I.

AU - Vanderspek, R

PY - 2021

Y1 - 2021

N2 - 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.

AB - 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.

KW - Asteroseismology

KW - Stars: chemically peculiar

KW - Stars: oscillations

KW - Techniques: photometric

KW - Stars: variables

KW - Stars: magnetic fields

U2 - 10.1093/mnras/stab1578

DO - 10.1093/mnras/stab1578

M3 - Journal article

SN - 0035-8711

VL - 506

SP - 1073

EP - 1110

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

ER -