{
  "id": "1111.3956",
  "version": "v1",
  "published": "2011-11-16T21:01:05.000Z",
  "updated": "2011-11-16T21:01:05.000Z",
  "title": "Two new accreting, pulsating white dwarfs: SDSS J1457+51 and BW Sculptoris",
  "authors": [
    "Helena Uthas",
    "Joseph Patterson",
    "Jonathan Kemp",
    "Christian Knigge",
    "Berto Monard",
    "Robert Rea",
    "Greg Bolt",
    "Jennie McCormick",
    "Grant Christie",
    "Alon Retter",
    "Alex Liu"
  ],
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We report the discovery of rapid periodic signals in the light curves of two cataclysmic variables with prominent white-dwarf components in their spectra, SDSS J1457+51 and BW Sculptoris. These stars therefore appear to be new members of the GW Lib class of variable star, in which the fast periodic (and non-commensurate with the orbital period) signals are believed to arise from non-radial pulsations in the underlying white dwarf. The power spectra of both stars show complex signals with primary periods near 10 and 20 minutes. These signals change in frequency by a few percent on a timescale of weeks or less, and probably contain an internal fine structure unresolved by our observations. We also detect double-humped waves signifying the underlying orbital periods, near 78 minutes for both stars. In addition, BW Scl shows a transient but powerful signal with a period near 87 minutes, a quiescent superhump. The 11 % excess over the orbital period is difficult to understand, and may arise from an eccentric instability near the 2:1 resonance in the accretion disc.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-16T21:01:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "pulsating white dwarfs",
      "bw sculptoris",
      "internal fine structure",
      "gw lib class",
      "prominent white-dwarf components"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2011.20042.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2012,
      "month": "Feb",
      "volume": 420,
      "number": 1,
      "pages": 379
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 946524,
      "adsabs": "2012MNRAS.420..379U"
    }
  }
}