Multiperiodic pulsations of the unique DAQ white dwarf J0551+4135: insights into a merger remnant
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2025
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| author | Uzundag, Murat Kilic, Mukremin De Gerónimo, Francisco C. Córsico, Alejandro H. Jewett, Gracyn Moss, Adam Rebassa-Mansergas, Alberto Brown, Alex J. Camisassa, Maria Bergeron, Pierre |
| author_facet | Uzundag, Murat Kilic, Mukremin De Gerónimo, Francisco C. Córsico, Alejandro H. Jewett, Gracyn Moss, Adam Rebassa-Mansergas, Alberto Brown, Alex J. Camisassa, Maria Bergeron, Pierre |
| contents | 2MASS J05513444+4135297 (herafter J0551+4135) is the only pulsating DAQ white dwarf known with a carbon and hydrogen atmosphere. Its unusual atmospheric composition and kinematics indicate a white dwarf merger origin. We present time-series photometry of J0551+4135 obtained using the Apache Point Observatory 3.5m, Gemini North 8m, and Gran Telescopio Canarias 10m telescopes. J0551+4135 exhibits variations in pulsation amplitude and frequency over time. We detect ten significant recurring peaks across different subsets of observations, with frequencies ranging from 987 to 1180~$μ$Hz, consistent with non-radial gravity ($g$)-mode oscillations. We present new evolutionary models suitable for spectroscopic characterization of DAQ white dwarfs, and derive a mass of $1.13 \pm 0.01\,M_\odot$ and a cooling age of $1.7 \pm 0.1$ Gyr for a CO core, and $1.12 \pm 0.01\,M_\odot$ and $1.6 \pm 0.1$\,Gyr for an ONe-core white dwarf, respectively. However, detailed asteroseismology of this unique pulsator has to wait until fully-consistent DAQ evolutionary models are available. Further observations, including multi-site campaigns to reduce daily aliasing and to improve the signal-to-noise ratio would be helpful for identification of additional modes and constraining the internal structure of this unique pulsator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06478 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multiperiodic pulsations of the unique DAQ white dwarf J0551+4135: insights into a merger remnant Uzundag, Murat Kilic, Mukremin De Gerónimo, Francisco C. Córsico, Alejandro H. Jewett, Gracyn Moss, Adam Rebassa-Mansergas, Alberto Brown, Alex J. Camisassa, Maria Bergeron, Pierre Solar and Stellar Astrophysics 2MASS J05513444+4135297 (herafter J0551+4135) is the only pulsating DAQ white dwarf known with a carbon and hydrogen atmosphere. Its unusual atmospheric composition and kinematics indicate a white dwarf merger origin. We present time-series photometry of J0551+4135 obtained using the Apache Point Observatory 3.5m, Gemini North 8m, and Gran Telescopio Canarias 10m telescopes. J0551+4135 exhibits variations in pulsation amplitude and frequency over time. We detect ten significant recurring peaks across different subsets of observations, with frequencies ranging from 987 to 1180~$μ$Hz, consistent with non-radial gravity ($g$)-mode oscillations. We present new evolutionary models suitable for spectroscopic characterization of DAQ white dwarfs, and derive a mass of $1.13 \pm 0.01\,M_\odot$ and a cooling age of $1.7 \pm 0.1$ Gyr for a CO core, and $1.12 \pm 0.01\,M_\odot$ and $1.6 \pm 0.1$\,Gyr for an ONe-core white dwarf, respectively. However, detailed asteroseismology of this unique pulsator has to wait until fully-consistent DAQ evolutionary models are available. Further observations, including multi-site campaigns to reduce daily aliasing and to improve the signal-to-noise ratio would be helpful for identification of additional modes and constraining the internal structure of this unique pulsator. |
| title | Multiperiodic pulsations of the unique DAQ white dwarf J0551+4135: insights into a merger remnant |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2511.06478 |