Tilted discs in six poorly studied cataclysmic variables

Abstract

In this work, we search for negative superhumps (nSHs) in poorly studied cataclysmic variables using TESS data. We find three eclipsing binaries with nSH signatures: HBHA 4204-09, Gaia DR3 5931071148325476992, and SDSS J090113.51+144704.6. The last one exhibits IW And-like behaviour in archival ZTF data, and appears to have shallow, grazing eclipses. In addition, we detect nSH signatures in two non-eclipsing systems: KQ Mon and Gaia DR3 4684361817175293440, by identifying the orbital period from the superorbital-dependent irradiation of the secondary. We discover nSH signatures in one more system, [PK2008] HalphaJ103959, by using an orbital period from another work. An improved mass ratio - nSH deficit relation $q({\epsilon }_{-})$ is suggested by us, which agrees with independent measurements on nova-like variables. With this relation, we estimate the mass ratios of all systems in our sample, and determine the orbital inclinations for the three that are eclipsing. All systems with discovered nSHs in this work are excellent targets for follow-up spectroscopic studies.

Accepted in MNRAS on 2023 January 20. Received 2023 January 15; in original form 2022 December 9. 13 pages, 6 tables, 11 figures. This is the authors' version of the accepted paper

References in corpus (16)

• Array Programming with NumPy
• The Transiting Exoplanet Survey Satellite
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Cataclysmic Variables from SDSS VII. The Seventh Year (2006)
• Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IX: The Ninth Year (2016-2017)
• TESS light curves of cataclysmic variables I -- Unknown periods in long-known stars
• Multi-band photometry and spectroscopy of an all-sky sample of bright white dwarfs
• Structure of accretion flows in the nova-like cataclysmic variable RW Tri
• KIC 9406652: A laboratory of the tilted disk in cataclysmic variable stars
• An Halpha-selected sample of cataclysmic variables -- I. Observations of newly discovered systems
• Detection of superhumps in the VY Scl-type nova-like variable KR Aur
• A 16-Year Photometric Campaign on the Eclipsing Novalike Variable DW Ursae Majoris
• KIC 9406652: A laboratory for tilted disks in cataclysmic variable stars. II. Modeling of the orbital light curves
• Negative superhumps in the eclipsing Z Cam + VY Scl star ES Dra
• Analysis of the IW And star ASAS J071404+7004.3