The search for ZZ Ceti stars in the original Kepler mission

S. Greiss, J. J. Hermes, B. T. Gänsicke, D. T. H. Steeghs, Keaton J. Bell, R. Raddi, P.-E. Tremblay, E. Breedt, G. Ramsay, D. Koester, Philip J Carter, Z. Vanderbosch, D. E. Winget, K. I. Winget

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

We report the discovery of 42 white dwarfs in the original Kepler mission field, including nine new confirmed pulsating hydrogen-atmosphere white dwarfs (ZZ Ceti stars). Guided by the Kepler-Isaac Newton Telescope Survey, we selected white dwarf candidates on the basis of their U - g, g - r, and r - Hα photometric colours. We followed up these candidates with high-signal-to-noise optical spectroscopy from the 4.2-m William Herschel Telescope. Using ground-based, time series photometry, we put our sample of new spectroscopically characterized white dwarfs in the context of the empirical ZZ Ceti instability strip. Prior to our search, only two pulsating white dwarfs had been observed by Kepler. Ultimately, four of our new ZZ Cetis were observed from space. These rich data sets are helping initiate a rapid advancement in the asteroseismic investigation of pulsating white dwarfs, which continues with the extended Kepler mission, K2.
Original languageEnglish
Pages (from-to)2855-2863
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume457
Issue number3
Early online date15 Feb 2016
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • asteroseismology
  • surveys
  • white dwarfs

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