Astronomy:TMTS J0526+5934
250px Location of TMTS J0526+5934 | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 05h 26m 10.42s[2] |
| Declination | +59° 34′ 45.3″[2] |
| Apparent magnitude (V) | 17.76[3] |
| Characteristics | |
| White dwarf | |
| Evolutionary stage | White dwarf[4] |
| Subdwarf | |
| Evolutionary stage | subdwarf[4] |
| Spectral type | sdB[4] |
| Astrometry | |
| Proper motion (μ) | RA: +1.418[2] mas/yr Dec.: +0.781[2] mas/yr |
| Parallax (π) | 1.1826 ± 0.0217[2] mas |
| Distance | 2,760 ± 50 ly (850 ± 20 pc) |
| Orbit[4] | |
| Period (P) | 20.5062426(53) min |
| Semi-major axis (a) | 0.255 R☉ |
| Eccentricity (e) | 0 (assumed) |
| Inclination (i) | 68.2+3.7 −5.2° |
| Details[4] | |
| A | |
| Radius | 0.011 R☉ |
| B | |
| Mass | ~0.33 M☉ |
| Radius | 0.0661±0.0054 R☉ |
| Luminosity | 1.70+0.31 −0.24 L☉ |
| Surface gravity (log g) | 6.36 cgs |
| Temperature | 25,480 K |
| Other designations | |
TMTS J052610.43+593445.1, ZTF J0526+5934[5] | |
| Database references | |
| SIMBAD | data |
TMTS J0526+5934 (abbreviated from TMTS J052610.43+593445.1 or ZTF J0526+5934) is an ultracompact binary star system located approximately 2,760 light-years away in the constellation Camelopardalis. It was initially identified in 2019 by the Zwicky Transient Facility (ZTF) as an extremely low-mass (ELM) white dwarf candidate, with further observations refining its classification.[6]
Discovery
Discovered by ZTF, it was further studied by the Tsinghua University–Ma Huateng Telescopes for Survey (TMTS), leading to its TMTS designation.[7][8][9]
Characteristics
It consists of a hot subdwarf B (sdB) star (J0526B) and a carbon-oxygen white dwarf (CO WD) companion (J0526A), forming a detached double white dwarf (DWD) binary, the fifth object with ultra-short period.[6] It holds the record for the shortest known orbital period of a detached single-degenerate binary at 20.5062426±0.0000053 min.[4][10][7] The subdwarf B star has a estimated radius of 0.0661±0.0054 R☉, representing possibly the smallest non-degenerate star known.[4]
Evolution and Future
TMTS J0526+5934 is expected to merge due to gravitational wave emission in about 1.8–3 million years. The merger could result in a massive white dwarf of roughly solar mass, a helium-rich star, or potentially a Type Ia supernova. Its strong gravitational wave signal makes it a promising verification binary for the ESA's Laser Interferometer Space Antenna (LISA) mission.[11][7][6]
See also
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Lasker, Barry M.; Lattanzi, Mario G.; McLean, Brian J.; Bucciarelli, Beatrice; Drimmel, Ronald; Garcia, Jorge; Greene, Gretchen; Guglielmetti, Fabrizia et al. (2008). "The Second-Generation Guide Star Catalog: Description and Properties". The Astronomical Journal 136 (2): 735. doi:10.1088/0004-6256/136/2/735. Bibcode: 2008AJ....136..735L.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Lin, Jie; Wu, Chengyuan; Xiong, Heran; Wang, Xiaofeng; Nemeth, Peter; Han, Zhanwen; Li, Jiangdan; Elias-Rosa, Nancy et al. (2024-02-10). "A seven-Earth-radius helium-burning star inside a 20.5-min detached binary". Nature Astronomy 8 (4): 491–503. doi:10.1038/s41550-023-02188-2. Bibcode: 2024NatAs...8..491L.
- ↑ "ZTF J0526+5934". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ZTF+J0526%2B5934.
- ↑ 6.0 6.1 6.2 Nowakowski, Tomasz. "J0526+5934 is an ultra-short period double white dwarf, observations show" (in en). https://phys.org/news/2024-02-j05265934-ultra-short-period-white.html.
- ↑ 7.0 7.1 7.2 Rebassa-Mansergas, Alberto; Hollands, Mark; Parsons, Steven G.; Althaus, Leandro G.; Pelisoli, Ingrid; Irawati, Puji; Raddi, Roberto; Camisassa, Maria E. et al. (2024-06-01). "J0526+5934: A peculiar ultra-short-period double white dwarf" (in en). Astronomy & Astrophysics 686: A221. doi:10.1051/0004-6361/202449519. ISSN 0004-6361. Bibcode: 2024A&A...686A.221R.
- ↑ Zeist, Wouter G. J. van; Roestel, Jan van; Nelemans, Gijs; Eldridge, Jan J.; Korol, Valeriya; Toonen, Silvia (2025-07-01). "Comparing population synthesis models of compact double white dwarfs to electromagnetic observations" (in en). Astronomy & Astrophysics 699: A172. doi:10.1051/0004-6361/202554302. ISSN 0004-6361. Bibcode: 2025A&A...699A.172V.
- ↑ Lin, Jie; Wang, Tinggui; Cai, Minxuan; Wan, Zhen; Li, Xuzhi; Fan, Lulu; Zhu, Qingfeng; Jiang, Ji-an et al. (2025-05-01). "Minute-cadence Observations of the Galactic Plane with the Wide Field Survey Telescope (WFST): Overview, Methodology, and Early Results". The Astrophysical Journal Supplement Series 278 (1): 29. doi:10.3847/1538-4365/adc0fc. ISSN 0067-0049. Bibcode: 2025ApJS..278...29L.
- ↑ "For this dead star, 72 years is a single Earth day". Space.Com. 19 February 2024. https://www.space.com/dead-white-dwarf-star-system-binary-72-years-one-day.
- ↑ Kosakowski, Alekzander; Kupfer, Thomas; Bergeron, P.; Littenberg, Tyson B. (2023-12-01). "Electromagnetic Characterization of the LISA Verification Binary ZTF J0526+5934". The Astrophysical Journal 959 (2): 114. doi:10.3847/1538-4357/ad0ce9. ISSN 0004-637X. Bibcode: 2023ApJ...959..114K.
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