Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5
Analyzing all 120 s and 20 s light curves obtained by the TESS satellite up to Sector 69—the end of the fifth year of observations—for all known white dwarfs and white dwarf candidates up to G = 17.5 mag, we report the discovery of 32 new pulsating DA white dwarf stars. For all objects, we obtained...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adc113 |
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| author | Alejandra D. Romero S. O. Kepler Gabriela Oliveira da Rosa J. J. Hermes |
| author_facet | Alejandra D. Romero S. O. Kepler Gabriela Oliveira da Rosa J. J. Hermes |
| author_sort | Alejandra D. Romero |
| collection | DOAJ |
| description | Analyzing all 120 s and 20 s light curves obtained by the TESS satellite up to Sector 69—the end of the fifth year of observations—for all known white dwarfs and white dwarf candidates up to G = 17.5 mag, we report the discovery of 32 new pulsating DA white dwarf stars. For all objects, we obtained the period spectra and performed a seismological analysis using full evolutionary models to estimate the structural parameters, such as effective temperature, stellar mass, and hydrogen envelope mass. The median stellar mass for the pulsators from asteroseismology is 0.609 M _⊙ , in agreement with the median value of photometric and spectroscopic determinations, 0.602 M _⊙ , excluding the low and extremely low mass objects. Finally, we found rotational-splitting multiplets for nine stars, which led to rotation periods between 4 hr and 1 day. |
| format | Article |
| id | doaj-art-cf4029c49cb44880a7c0174af0b37862 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-cf4029c49cb44880a7c0174af0b378622025-08-20T03:11:52ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01984211210.3847/1538-4357/adc113Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5Alejandra D. Romero0https://orcid.org/0000-0002-0797-0507S. O. Kepler1Gabriela Oliveira da Rosa2J. J. Hermes3https://orcid.org/0000-0001-5941-2286Instituto de Física, Universidade Federal do Rio Grande do Sul , 91501-970 Porto Alegre, RS, BrazilInstituto de Física, Universidade Federal do Rio Grande do Sul , 91501-970 Porto Alegre, RS, BrazilInstituto de Física, Universidade Federal do Rio Grande do Sul , 91501-970 Porto Alegre, RS, BrazilDepartment of Astronomy & Institute for Astrophysical Research, Boston University , 725 Commonwealth Ave., Boston, MA 02215, USAAnalyzing all 120 s and 20 s light curves obtained by the TESS satellite up to Sector 69—the end of the fifth year of observations—for all known white dwarfs and white dwarf candidates up to G = 17.5 mag, we report the discovery of 32 new pulsating DA white dwarf stars. For all objects, we obtained the period spectra and performed a seismological analysis using full evolutionary models to estimate the structural parameters, such as effective temperature, stellar mass, and hydrogen envelope mass. The median stellar mass for the pulsators from asteroseismology is 0.609 M _⊙ , in agreement with the median value of photometric and spectroscopic determinations, 0.602 M _⊙ , excluding the low and extremely low mass objects. Finally, we found rotational-splitting multiplets for nine stars, which led to rotation periods between 4 hr and 1 day.https://doi.org/10.3847/1538-4357/adc113Stellar oscillationsSurveysWhite dwarf stars |
| spellingShingle | Alejandra D. Romero S. O. Kepler Gabriela Oliveira da Rosa J. J. Hermes Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 The Astrophysical Journal Stellar oscillations Surveys White dwarf stars |
| title | Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 |
| title_full | Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 |
| title_fullStr | Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 |
| title_full_unstemmed | Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 |
| title_short | Thirty-two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5 |
| title_sort | thirty two new bright zz ceti stars from tess adding cycles 4 and 5 |
| topic | Stellar oscillations Surveys White dwarf stars |
| url | https://doi.org/10.3847/1538-4357/adc113 |
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