Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features

Open Access

Fig. 7.

χ² distribution for cyclotron spectrum fitting of ZTF J0112+5827. The color scale represents different temperatures from 20 to 50 keV. The magnetic field strength varies from 20 to 60 MG. The best-fit parameters are $B = 38 . 7_{- 1.1}^{+ 1.3}$ $B = 38.7_{-1.1}^{+1.3}$ and $T_{e} = 37_{- 3}^{+ 2}$ $T_e = 37_{-3}^{+2}$ keV (marked by red star), which reproduce the observed cyclotron harmonics in the optical spectra well.

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