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Related papers: The Space Density of Post-Period Minimum Cataclysm…

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We present the first X-ray observations with the XMM-Newton and INTEGRAL satellites of the recently discovered cataclysmic variable 1RXSJ173021.5-055933, together with simultaneous UV and coordinated optical photometry aiming at…

Only a handful of gas giant planets orbiting white dwarfs are known. It remains unclear whether this paucity reflects observational challenges or the consequences of stellar evolution. We aim to carry out population synthesis of substellar…

We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of high-quality far-ultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the eleven polars,…

I review what we know about the donor stars in cataclysmic variables (CVs), focusing particularly on the close link between these binary components and the overall secular evolution of CVs. I begin with a brief overview of the "standard…

Solar and Stellar Astrophysics · Physics 2015-03-17 Christian Knigge

Strong selection effects are present in observational samples of cataclysmic variables (CVs), complicating comparisons to theoretical predictions. The selection criteria used to define most CV samples discriminate heavily against the…

Astrophysics · Physics 2009-11-13 Magaretha L. Pretorius , Christian Knigge

We model the population of double white dwarfs in the Galaxy and find a better agreement with observations compared to earlier studies, due to two modifications. The first is the treatment of the first phase of unstable mass transfer and…

Astrophysics · Physics 2010-03-01 Gijs Nelemans , Lev R. Yungelson , Simon F. Portegies Zwart , Frank Verbunt

Identification of white dwarfs (WD) with main-sequence (MS) companions and characterization of their properties can put important constraints on our understanding of binary stellar evolution and guide the theoretical predictions for a wide…

Solar and Stellar Astrophysics · Physics 2023-11-27 Prasanta K. Nayak , Anindya Ganguly , Sourav Chatterjee

Many low-mass white dwarfs are being discovered in the field of our galaxy and some of them exhibit $g$-mode pulsations, comprising the extremely low-mass variable (ELMV) stars class. Despite it is generally believed that these stars are…

Solar and Stellar Astrophysics · Physics 2018-09-26 L. M. Calcaferro , A. H. Córsico , L. G. Althaus , A. D. Romero , S. O. Kepler

We present time resolved CCD photometry of 15 cataclysmic variables (CVs) identified by the Sloan Digital Sky Survey (SDSS). The data were obtained as part of the 2004/05 International Time Programme on La Palma. We discuss the morphology…

Every massive globular cluster (GC) is expected to harbour a significant population of cataclysmic variables (CVs). In this review, I first explain why GC CVs matter astrophysically, how many and what types are theoretically predicted to…

Solar and Stellar Astrophysics · Physics 2012-02-13 Christian Knigge

We have extracted spectra of 20 magnetic Cataclysmic Variables (mCVs) from the RXTE archive and fitted them using the X-ray continuum method of Cropper et al to determine the mass of the accreting white dwarf in each system. We find…

Astrophysics · Physics 2009-10-31 Gavin Ramsay

A large number of white dwarf and donor masses in cataclysmic variables have been found via modelling the primary eclipse, a method that relies on untested assumptions. Recent measurements of the mass of the white dwarf in the cataclysmic…

Solar and Stellar Astrophysics · Physics 2023-11-14 S. P. Littlefair , Pablo Rodríguez-Gil , T. R. Marsh , S. G. Parsons , V. S. Dhillon

In this chapter we consider the processes which can lead to X-ray emission from different types of cataclysmic variable stars (CVs). CVs are semi-detached, binary star systems where material is transferred from the donor star (also known as…

High Energy Astrophysical Phenomena · Physics 2023-04-05 K. L. Page , A. W. Shaw

Accreting white dwarfs (WDs) with non-degenerate companions are expected to emit in soft X-rays and the UV, if accreted H-rich material burns stably. They are an important component of the unresolved emission of elliptical galaxies, and…

Solar and Stellar Astrophysics · Physics 2015-09-16 Hai-Liang Chen , T. E. Woods , L. R. Yungelson , M. Gilfanov , Zhanwen Han

We have performed a study of the orbital properties of seven eclipsing cataclysmic variable (CV) binary systems by analyzing photometric time series from the Transiting Exoplanet Survey Satellite (TESS). We employed Python code to determine…

Solar and Stellar Astrophysics · Physics 2025-01-22 Mennatalla Mahmoud Ellaqany , Valeria Garcia-Lopez , Emily S. Hatten , Mridul Agarwal , David A. Moffett

The disk instability model attributes the outbursts of dwarf novae to a thermal-viscous instability of their accretion disk, an instability to which nova-like stars are not subject. We aim to test the fundamental prediction of the disk…

High Energy Astrophysical Phenomena · Physics 2018-09-19 Guillaume Dubus , Magdalena Otulakowska-Hypka , Jean-Pierre Lasota

We present a catalogue of 507 cataclysmic variables (CVs) observed in SDSS I to IV including 70 new classifications collated from multiple archival data sets. This represents the largest sample of CVs with high-quality and homogeneous…

We reconstruct the evolutionary path followed by cataclysmic variables (CVs) from the observed mass-radius relationship of their donor stars. Along the way, we update the semi-empirical CV donor sequence of Knigge (2006) and present a…

Solar and Stellar Astrophysics · Physics 2015-05-27 Christian Knigge , Isabelle Baraffe , Joseph Patterson

We present a sample of 59 periodic variables from the Palomar Transient Factory, selected from published catalogues of white dwarf (WD) candidates. The variability can likely be attributed to ellipsoidal variation of the tidally distorted…

Solar and Stellar Astrophysics · Physics 2016-07-18 Wil Kao , David L. Kaplan , Thomas A. Prince , Sumin Tang , Irina Ene , Kyu Bin Kim , David Levitan , Shrinivas R. Kulkarni , Russ R. Laher

Context. White dwarfs (WDs) in cataclysmic variables (CVs) are important experimental laboratories where the electron degeneracy is taking place on a macroscopic scale. Magnetic CVs increase in number especially in the hard X-ray band (>10…

High Energy Astrophysical Phenomena · Physics 2015-05-19 Takayuki Yuasa , Kazuhiro Nakazawa , Kazuo Makishima , Kei Saitou , Manabu Ishida , Ken Ebisawa , Hideyuki Mori , Shin'ya Yamada