Roche tomography of cataclysmic variables - VIII: The irradiated and spotted dwarf nova, SS Cygni

Abstract

We present the results of our spectroscopic study of the dwarf nova SS Cygni, using Roche tomography to map the stellar surface and derive the system parameters. Given that this technique takes into account the inhomogeneous brightness distribution on the surface of the secondary star, our derived parameters are (in principle) the most robust yet found for this system. Furthermore, our surface maps reveal that the secondary star is highly spotted, with strongly asymmetric irradiation on the inner hemisphere. Moreover, by constructing Doppler tomograms of several Balmer emission lines, we find strong asymmetric emission from the irradiated secondary star, and an asymmetric accretion disc that exhibits spiral structures.

arXiv comment10 pages, 11 figures, accepted for publication in MNRAS

References in corpus (22)

• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Kepler observations of the beaming binary KPD 1946+4340
• On the late spectral types of cataclysmic variable secondaries
• The Secondary Star in Cataclysmic Variables and Low Mass X-ray Binaries
• The coronal structure of AB Dor determined from contemporaneous Doppler imaging and X-ray spectroscopy
• Magnetic flux transport on active cool stars and starspot lifetimes
• An accurate geometric distance to the compact binary SS Cygni vindicates accretion disc theory
• The Masses and Evolutionary State of the Stars in the Dwarf Nova SS Cygni
• Roche tomography of cataclysmic variables - IV. Starspots and slingshot prominences on BV Cen
• Roche tomography of cataclysmic variables: I. artefacts and techniques
• Roche tomography of cataclysmic variables -- II. Images of the secondary stars in AM Her, QQ Vul, IP Peg and HU Aqr
• Roche tomography of cataclysmic variables -- III. Starspots on AE Aqr
• The systemic velocities of four long-period cataclysmic variable stars
• The crowded magnetosphere of the post common envelope binary QS Virginis
• Mass estimates in short-period compact binaries
• The spotty donor star in the X-ray transient Cen X-4
• Spectroscopic Evidence for Starspots on the Secondary Star of SS Cygni
• Secondary stars in CVs - the observational picture
• Roche tomography of cataclysmic variables - VI. Differential rotation of AE Aqr - Not tidally locked!
• Roche tomography of cataclysmic variables - V. A high-latitude star-spot on RU Pegasi
• Roche tomography of cataclysmic variables - VII. The long-term magnetic activity of AE Aqr

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• When the disc's away, the stars will play: dynamical masses in the nova-like variable KR Aur with a pinch of accretion
• The Surface Magnetic Activity of the Weak-Line T Tauri Stars TWA 9A and V1095 Sco
• On the nature of the anomalous event in 2021 in the dwarf nova SS Cygni and its multi-wavelength transition
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• Detection of highly correlated optical and X-ray variations in SS Cygni with Tomo-e Gozen and NICER
• The light curve simulations of the 2021 anomalous event in SS Cygni
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