First discovery of quasi-periodic oscillations in the dwarf nova HS 2325+8205 based on TESS photometry

• DOI: 10.1093/mnras/stac3272
• Publication Date: 2022-12-05T16:13:22Z
• Authors: Qi-Bin Sun; Sheng-Bang Qian; Li-Ying Zhu; Ai-Jun Dong; Qi-Jun Zhi; Wen-Ping Liao; Er-Gang Zhao; Zhong-Tao Han; Wei Liu; Lei Zang; Fu-Xing Li; Xiang-Dong Shi
• Keywords: Orbital period; Dwarf nova; Oscillation (cell signaling); Periodogram

HS 2325+8205 is a long-period eclipsing dwarf nova with an orbital period above the gap (Porb>3 h) and reported to be Z Cam-type nova. Based on photometry of Transiting Exoplanet Survey Satellite (TESS), light variation quasi-periodic oscillation (QPOs) are studied. Using Continuous Wavelet Transform (CWT), Lomb-Scargle Periodogram (LSP), sine fitting methods, we find for first time that there QPOs ~ 2160s in long outburst top curves 2325+8205. Moreover, intensity related phase, phases 0.5-0.9 stronger than 0.1-0.5. Therefore, relationship between phase may become research window origin QPOs. In addition, use LSP correct as 0.19433475(6) d.