Photometric Analysis of TCP J20171288$+$1156589 -- WZ Sge Type Dwarf Nova with Delayed Ordinary Superhumps Emergence

Alexander Tarasenkov; Sergey Shugarov; Natalia Ikonnikova; Marina Burlak; Sergey Nazarov; Sjoerd Dufoer

doi:10.1007/s10509-025-04525-5

paper

Photometric Analysis of TCP J20171288 $+$ 1156589 -- WZ Sge Type Dwarf Nova with Delayed Ordinary Superhumps Emergence

arXiv:2512.06372 · doi:10.1007/s10509-025-04525-5

Abstract

We present the results of photometric analysis of WZ Sge type dwarf nova TCP J20171288 $+$ 1156589. This object exhibited an outburst with a large amplitude of $> 7.9$ magnitudes and was observed for over a month. The photometric evolution of the superoutburst was atypical for WZ Sge-type dwarf novae. Periodogram analisys reveals early superhumps with the most probable period of $0.0611 \pm 0.0001$ days during the initial decline. After a plateau phase of approximately 11 days, ordinary superhumps (likely stage B) emerged with a period of $0.0616 \pm 0.0001$ days, corresponding to a superhump excess of $ε = 0.008$ correspondingly. This delay in the onset of ordinary superhumps is an unusual feature among WZ Sge stars. We evaluated the main parameters of the system: mass ratio $q = M_{R D} / M_{W D} = 0.06 \pm 0.005$ , yielding component masses of $M_{W D} \sim 1.0 \pm 0.15 M_{⊙}$ for the white dwarf and $M_{R D} = 0.06 \pm 0.01 M_{⊙}$ for the donor. The estimated distance to the system is $\sim 850$ pc, and the binary separation is $a = 0.67 \pm 0.03 R_{⊙}$ .

Accepted for publication in Astrophysics and Space Science

Photometric Analysis of TCP J20171288+1156589 -- WZ Sge Type Dwarf Nova with Delayed Ordinary Superhumps Emergence

Abstract

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Photometric Analysis of TCP J20171288 $+$ 1156589 -- WZ Sge Type Dwarf Nova with Delayed Ordinary Superhumps Emergence