ASASSN-21co: A Detached Eclipsing Binary with an 11.9 yr Period

@article{Rowan2021ASASSN21coAD,
  title={ASASSN-21co: A Detached Eclipsing Binary with an 11.9 yr Period},
  author={Dominick M. Rowan and Krzysztof Zbigniew Stanek and Zachary Way and Christopher S. Kochanek and Tharindu Jayasinghe and Todd A. Thompson and Helen Barker and F.-J. Hambsch and Terry C. Bohlsen and Stella Kafka and Benjamin. J. Shappee and Thomas W.-S. Holoien and Jos{\'e} Luis Prieto},
  journal={Research Notes of the AAS},
  year={2021},
  volume={5}
}
We use ASAS V-band and ASAS-SN g-band observations to model the long-period detached eclipsing binary ASASSN-21co. ASAS observations show an eclipse of depth V ∼ 0.6 mag in 2009 April. ASAS-SN g-band observations from 2021 March show an eclipse of similar duration and depth, suggesting an orbital period of 11.9 yr. We combine the g-band observations with additional BVRI photometry taken during the eclipse to model the eclipse using PHOEBE. We find that the system is best described by two M… 

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