Discovery of the Richest Pulsating Ultramassive White Dwarf
The discovery of pulsations in ultramassive (UM) white dwarfs (WDs) can help to probe their interiors and unveil their core composition and crystallized mass fraction through asteroseismic techniques. To date, the richest pulsating UM WD known is BPM 37093 with 8 modes detected, for which detailed a...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/adad73 |
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| author | Francisco C. De Gerónimo Murat Uzundag Alberto Rebassa-Mansergas Alex Brown Mukremin Kilic Alejandro H. Córsico Gracyn C. Jewett Adam G. Moss |
| author_facet | Francisco C. De Gerónimo Murat Uzundag Alberto Rebassa-Mansergas Alex Brown Mukremin Kilic Alejandro H. Córsico Gracyn C. Jewett Adam G. Moss |
| author_sort | Francisco C. De Gerónimo |
| collection | DOAJ |
| description | The discovery of pulsations in ultramassive (UM) white dwarfs (WDs) can help to probe their interiors and unveil their core composition and crystallized mass fraction through asteroseismic techniques. To date, the richest pulsating UM WD known is BPM 37093 with 8 modes detected, for which detailed asteroseismic analysis has been performed in the past. In this work, we report the discovery of 19 pulsation modes in the UM WD star WD J0135+5722, making it the richest pulsating hydrogen-atmosphere UM WD known to date. This object exhibits multiperiodic luminosity variations with periods ranging from 137 to 1345 s, typical of pulsating WDs in the ZZ Ceti instability strip, which is centered at T _eff ∼ 12,000 K. We estimate the stellar mass of WD J0135+5722 by different methods, resulting in M _⋆ ∼ 1.12–1.14 M _⊙ if the star’s core is made of oxygen and neon or M _⋆ ∼ 1.14–1.15 M _⊙ if the star hosts a carbon oxygen core. Future analysis of the star periods could shed light on the core chemical composition through asteroseismology. |
| format | Article |
| id | doaj-art-0510ec77f9d74a08ab62f402579d35ac |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-0510ec77f9d74a08ab62f402579d35ac2025-02-07T07:09:34ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019801L910.3847/2041-8213/adad73Discovery of the Richest Pulsating Ultramassive White DwarfFrancisco C. De Gerónimo0Murat Uzundag1https://orcid.org/0000-0002-6603-994XAlberto Rebassa-Mansergas2https://orcid.org/0000-0002-6153-7173Alex Brown3https://orcid.org/0000-0002-3316-7240Mukremin Kilic4https://orcid.org/0000-0001-6098-2235Alejandro H. Córsico5https://orcid.org/0000-0002-0006-9900Gracyn C. Jewett6https://orcid.org/0009-0009-9105-7865Adam G. Moss7https://orcid.org/0000-0001-7143-0890Instituto de Astrofísica de La Plata , CONICET-UNLP, La Plata, ArgentinaInstitute of Astronomy , KU Leuven, Celestijnenlaan 200D, 3001, Leuven, BelgiumDepartament de Física, Universitat Politècnica de Catalunya , c/Esteve Terrades 5, 08860 Castelldefels, Spain; Institut d’Estudis Espacials de Catalunya , Esteve Terradas, 1, Edifici RDIT, Campus PMT-UPC, 08860 Castelldefels, Barcelona, SpainDepartament de Física, Universitat Politècnica de Catalunya , c/Esteve Terrades 5, 08860 Castelldefels, SpainHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma , 440 W. Brooks St., Norman, OK 73019, USAInstituto de Astrofísica de La Plata , CONICET-UNLP, La Plata, ArgentinaHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma , 440 W. Brooks St., Norman, OK 73019, USAHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma , 440 W. Brooks St., Norman, OK 73019, USAThe discovery of pulsations in ultramassive (UM) white dwarfs (WDs) can help to probe their interiors and unveil their core composition and crystallized mass fraction through asteroseismic techniques. To date, the richest pulsating UM WD known is BPM 37093 with 8 modes detected, for which detailed asteroseismic analysis has been performed in the past. In this work, we report the discovery of 19 pulsation modes in the UM WD star WD J0135+5722, making it the richest pulsating hydrogen-atmosphere UM WD known to date. This object exhibits multiperiodic luminosity variations with periods ranging from 137 to 1345 s, typical of pulsating WDs in the ZZ Ceti instability strip, which is centered at T _eff ∼ 12,000 K. We estimate the stellar mass of WD J0135+5722 by different methods, resulting in M _⋆ ∼ 1.12–1.14 M _⊙ if the star’s core is made of oxygen and neon or M _⋆ ∼ 1.14–1.15 M _⊙ if the star hosts a carbon oxygen core. Future analysis of the star periods could shed light on the core chemical composition through asteroseismology.https://doi.org/10.3847/2041-8213/adad73White dwarf starsStellar oscillationsZZ Ceti stars |
| spellingShingle | Francisco C. De Gerónimo Murat Uzundag Alberto Rebassa-Mansergas Alex Brown Mukremin Kilic Alejandro H. Córsico Gracyn C. Jewett Adam G. Moss Discovery of the Richest Pulsating Ultramassive White Dwarf The Astrophysical Journal Letters White dwarf stars Stellar oscillations ZZ Ceti stars |
| title | Discovery of the Richest Pulsating Ultramassive White Dwarf |
| title_full | Discovery of the Richest Pulsating Ultramassive White Dwarf |
| title_fullStr | Discovery of the Richest Pulsating Ultramassive White Dwarf |
| title_full_unstemmed | Discovery of the Richest Pulsating Ultramassive White Dwarf |
| title_short | Discovery of the Richest Pulsating Ultramassive White Dwarf |
| title_sort | discovery of the richest pulsating ultramassive white dwarf |
| topic | White dwarf stars Stellar oscillations ZZ Ceti stars |
| url | https://doi.org/10.3847/2041-8213/adad73 |
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