V729 Sgr: A long period dwarf nova showing negative superhumps during quiescence

Abstract

We report K2 observations of the eclipsing cataclysmic variable V729 Sgr which covered nearly 80 days in duration. We find five short outbursts and two long outbursts, one of which shows a clear plateau phase in the rise to maximum brightness. The mean time between successive short outbursts is ~10 d while the time between the two long outbursts is ~38 d. The frequency of these outbursts are unprecedented for a CV above the orbital period gap. We find evidence that the mid-point of the eclipse occurs systematically earlier in outburst than in quiescence. During five of the six quiescent epochs we find evidence for a second photometric period which is roughly 5 percent shorter than the 4.16 h orbital period which we attribute to negative superhumps. V729 Sgr is therefore one of the longest period CVs to show negative superhumps during quiescence.

arXiv commentAccepted for publication in MNRAS

References in corpus (18)

• The K2 Mission: Characterization and Early results
• Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• Superhumps in Cataclysmic Binaries. XXV. q_crit, epsilon(q), and Mass-Radius
• Magnetically Driven Warping, Precession and Resonances in Accretion Disks
• V344 Lyrae: A Touchstone SU UMa Cataclysmic Variable in the Kepler Field
• The Cause of the Superoutburst in SU UMa Stars is Finally Revealed by Kepler Light Curve of V1504 Cygni
• SPH Simulations of Negative (Nodal) Superhumps: A Parametric Study
• Statistical analysis of properties of dwarf novae outbursts
• KIC 9406652: An Unusual Cataclysmic Variable in the Kepler Field of View
• The Emergence of Negative Superhumps in Cataclysmic Variables: Smoothed Particle Hydrodynamics Simulations
• Kepler Observations of V447 Lyr: An Eclipsing U Gem Cataclysmic Variable
• The Shape of Long Outbursts in U Gem Type Dwarf Novae from AAVSO Data
• Cataclysmic Variables observed during K2 Campaigns 0 and 1
• Kepler K2 Observations of the Intermediate Polar FO Aquarii
• Kepler observations of the eclipsing cataclysmic variable KIS J192748.53+444724.5
• RZ Leonis Minoris Bridging between ER Ursae Majoris-Type Dwarf Nova and Novalike System

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• A Comprehensive K2 and Ground-Based Study of CRTS J035905.9+175034, an Eclipsing SU UMa System with a Large Mass Ratio
• Evolution of negative superhumps, quasi-periodic oscillations and outbursts in the Z Cam-type dwarf nova AH Her
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