TESS light curves of cataclysmic variables -- III -- More superhump systems among old novae and novalike variables

Abstract

Continuing previous work on the identification and characterization of periodic and non-periodic variations in long and almost uninterrupted high cadence light curves of cataclysmic variables observed by the TESS mission, the results on 23 novalike variables and old novae out of sample of 127 suchsystems taken from the Ritter & Kolb catalogue are presented. All of them exhibit at least at some epochs either positive or negative (or both) superhumps, and in 19 of them superhumps were detected for the first time. The basic properties of the superhumps such as their periods, their appearance and disappearance, and their waveforms are explored. Together with recent reports in the literature, this elevates the number of known novalike variables and old novae with superhumps by more than 50%. The previous census of superhumps and the Stolz-Schoembs relation for these stars are updated. Attention is drawn to superhump properties in some stars which behave differently from the average, as well as to positive superhumps in high mass ratio systems which defy theory. As a byproduct, the orbital periods of 13 stars are either improved or newly measured, correcting previously reported erroneous values.

References in corpus (20)

• The Transiting Exoplanet Survey Satellite
• SW Sextantis stars: the dominant population of CVs with orbital periods between 3-4 hours
• Spectroscopic search for new SW Sextantis stars in the 3-4 hour orbital period range -- I
• Superhumps: Confronting Theory with Observation
• Localised thermonuclear bursts from accreting magnetic white dwarfs
• A comparative study of the strength of flickering in cataclysmic variables
• Comprehensive Listing of 156 Reliable Orbital Periods for Novae, Including 49 New Periods
• TESS light curves of cataclysmic variables I -- Unknown periods in long-known stars
• TESS light curves of cataclysmic variables -- II: Superhumps in old novae and novalike variables
• New Variable Hot Subdwarf Stars Identified from Anomalous Gaia Flux Errors, Observed by TESS, and Classified via Fourier Diagnostics
• XMM-Newton observations of eleven intermediate polars and possible candidates
• Spectroscopic Orbital Periods for 29 Cataclysmic Variables from the Sloan Digital Sky Survey
• An Halpha-selected sample of cataclysmic variables -- I. Observations of newly discovered systems
• The magnetic SW Sextantis star RX J1643.7+3402
• Rapid bursts of magnetically gated accretion in the intermediate polar V1025 Cen
• A Step towards Unveiling the Nature of Three Cataclysmic Variables: LS Cam, V902 Mon, and SWIFT J0746.3-1608
• Magnetically-gated accretion model: application to short bursts in the intermediate polar V1223 Sgr
• Tilted discs in six poorly studied cataclysmic variables
• A possible giant planet orbiting the cataclysmic variable LX Ser
• Superhumps in the cataclysmic variable BG Tri

Cited by in corpus (7)

• Nine New Cataclysmic Variable Stars with Negative Superhumps
• 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
• Superoutbursts and Positive Superhumps Occurred During the Standstill of a Z Cam-type Dwarf Nova
• A New IW And-Type Star: Karachurin 12 with Tilted Disks and Diverse cycles
• TCP J07222683$+$6220548: a new AM CVn type system with infrequent outbursts
• A systematic search for orbital periods of polars with TESS. Methods, detection limits, and results