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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS

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Alejandra D. Romero
  • Function : Author
S. O. Kepler
  • Function : Author
J. J. Hermes
  • Function : Author
Larissa Antunes Amaral
  • Function : Author
Murat Uzundag
  • Function : Author
Zsófia Bognár
  • Function : Author
Keaton J. Bell
  • Function : Author
Madison Vanwyngarden
  • Function : Author
Andy Baran
  • Function : Author
Ingrid Pelisoli
  • Function : Author
Gabriela da Rosa Oliveira
  • Function : Author
Detlev Koester
  • Function : Author
T. S. Klippel
  • Function : Author
Luciano Fraga
  • Function : Author
Paul A. Bradley
  • Function : Author
Maja Vučković
  • Function : Author
Tyler M. Heintz
  • Function : Author
Joshua S. Reding
  • Function : Author
B. C. Kaiser
  • Function : Author

Abstract

We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite mission, from Sectors 1 to 39, corresponding to the first 3 cycles. This includes objects from the Southern hemisphere (Sectors 1-13 and 27-39) and the Northern hemisphere (Sectors 14-26), observed with 120 s- and 20 s-cadence. Our sample likely includes 13 low-mass and one extremely low-mass white dwarf candidate, considering the mass determinations from fitting Gaia magnitudes and parallax. In addition, we present follow-up time series photometry from ground-based telescopes for 11 objects, which allowed us to detect a larger number of periods. For each object, we analysed the period spectra and performed an asteroseismological analysis, and we estimate the structure parameters of the sample, i.e. stellar mass, effective temperature, and hydrogen envelope mass. We estimate a mean asteroseismological mass of ⟨Msis⟩ = 0.635 ± 0.015 M, excluding the candidate low or extremely low-mass objects. This value is in agreement with the mean mass using estimates from Gaia data, which is ⟨Mphot⟩ = 0.631 ± 0.040 M, and with the mean mass of previously known ZZ Cetis of ⟨M*⟩ = 0.644 ± 0.034 M. Our sample of 74 new bright ZZ Cetis increases the number of known ZZ Cetis by ~20 per cent.

Dates and versions

insu-03672023 , version 1 (19-05-2022)

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Cite

Alejandra D. Romero, S. O. Kepler, J. J. Hermes, Larissa Antunes Amaral, Murat Uzundag, et al.. Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS. Monthly Notices of the Royal Astronomical Society, 2022, 511, pp.1574-1590. ⟨10.1093/mnras/stac093⟩. ⟨insu-03672023⟩
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