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

Romero, Alejandra D. and Kepler, S. O. and Hermes, J. J. and Amaral, Larissa Antunes and Uzundag, Murat and Sódorné Bognár, Zsófia (2022) Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 511. pp. 1574-1590. ISSN 0035-8711

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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.

Item Type: Article
Uncontrolled Keywords: surveys; Astrophysics - Solar and Stellar Astrophysics; stars: oscillations; stars: white dwarfs;
Subjects: Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 23 Sep 2022 12:33
Last Modified: 23 Sep 2022 12:33
URI: http://real.mtak.hu/id/eprint/149600

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