A tentative 114-minute orbital period challenges the ultra-compact nature of the X-ray binary 4U 1812-12
| Autor: | Padilla, M. Armas, Rodríguez-Gil, P., Muñoz-Darias, T., Torres, M. A. P., Casares, J., Degenaar, N., Dhillon, V. S., Heinke, C. O., Littlefair, S. P., Marsh, T. R. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/ac6d54 |
| Popis: | We present a detailed time-resolved photometric study of the ultra-compact X-ray binary candidate 4U 1812-12. The multicolor light curves obtained with HiPERCAM on the 10.4-m Gran Telescopio Canarias show an aprox 114 min modulation similar to a superhump. Under this interpretation, this period should lie very close to the orbital period of the system. Contrary to what its other observational properties suggest (namely, persistent dim luminosity, low optical-to-X-ray flux ratio and lack of hydrogen features in the optical spectrum), this implies that 4U1812-12 is most likely not an ultra-compact X-ray binary, which are usually defined as systems with orbital periods lower than 80 min. We discuss the nature of the system, showing that a scenario in which 4U 1812-12 is the progenitor of an ultra-compact X-ray binary may reconcile all the observables. Comment: Accepted for publication in ApJ Letters |
| Databáze: | arXiv |
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