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Title: SDSS J001153.08–064739.2, A cataclysmic variable with an evolved donor in the period gap

Secondary stars in cataclysmic variables (CVs) follow a well-defined period-density relation. Thus, canonical donor stars in CVs are generally low-mass stars of spectral type M. However, several CVs have been observed containing secondary stars that are too hot for their inferred masses. This particular configuration can be explained if the donor stars in these systems underwent significant nuclear evolution before they reached contact. In this paper, we present SDSS J001153.08–064739.2 as an additional example belonging to this peculiar type of CV and discuss in detail its evolutionary history. We perform spectroscopic and photometric observations and make use of available Catalina Real-Time Transient Survey photometry to measure the orbital period of SDSS J001153.08–064739.2 as 2.4 hr and estimate the white dwarf (M{sub wd} > 0.65 M{sub ☉}) and donor star (0.21 M{sub ☉} < M{sub don} < 0.45 M{sub ☉}) masses, the mass ratio (q = 0.32 ± 0.08), the orbital inclination (47° < i < 70°); derive an accurate orbital ephemeris (T{sub 0} = 2453383.578(1) + E × 0.10028081(8)); and report the detection of an outburst. We show that SDSS J001153.08–064739.2 is one of the most extreme cases in which the donor star is clearly too hot for its mass.more » SDSS J001153.08–064739.2 is therefore not only a peculiar CV containing an evolved donor star, but also an accreting CV within the period gap. Intriguingly, approximately half of the total currently observed sample of these peculiar CVs are located in the period gap with nearly the same orbital period.« less
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6]
  1. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
  2. Departamento de Física y Astronomía, Universidad de Valparaíso, Valparaíso (Chile)
  3. Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF (United Kingdom)
  4. National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing (China)
  5. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  6. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)
Publication Date:
OSTI Identifier:
22365602
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 790; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; CONFIGURATION; DENSITY; DETECTION; INCLINATION; MASS; NOVAE; PHOTOMETRY; TRANSIENTS; WHITE DWARF STARS