First discovery of QPOs in the dwarf nova HS 2325+8205 based on TESS photometry

Abstract

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

References in corpus (12)

• The Transiting Exoplanet Survey Satellite
• The disc instability model of dwarf-novae and low-mass X-ray binary transients
• Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
• The Donor Stars of Cataclysmic Variables
• Rapid Oscillations in Cataclysmic Variables
• Superhumps in Cataclysmic Binaries. XXIII. V442 Ophiuchi and RX J1643.7+3402
• Hunting For Eclipses: High Speed Observations of Cataclysmic Variables
• HS0139+0559, HS0229+8016, HS0506+7725 and HS0642+5049: Four new long-period cataclysmic variables
• Thermal-viscous instability in tilted accretion disks: a possible application to IW And-type dwarf novae
• HS 2325+8205 - an ideal laboratory for accretion disk physics
• Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra
• QPOs in compact binaries from small scale eruptions in an inner magnetized disk

Cited by in corpus (7)

• Nine New Cataclysmic Variable Stars with Negative Superhumps
• Evolution of negative superhumps, quasi-periodic oscillations and outbursts in the Z Cam-type dwarf nova AH Her
• A New Window for Studying Intermediate Polars and Tilted Accretion Disk Precession
• Tilted Disk Precession and Negative Superhumps in HS 2325+8205: A Multi-Window Analysis
• A New IW And-Type Star: Karachurin 12 with Tilted Disks and Diverse cycles
• Superoutbursts and Positive Superhumps Occurred During the Standstill of a Z Cam-type Dwarf Nova
• Photometric analysis of the dwarf nova SU UMa based on TESS