PTF1J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey

David Levitan, Benjamin J. Fulton, Paul J. Groot, Shrinivas R. Kulkarni, Eran O. Ofek, Thomas A. Prince, Avi Shporer, Joshua S. Bloom, S. Bradley Cenko, Mansi M. Kasliwal, Nicholas M. Law, Peter E. Nugent, Dovi Poznanski, Robert M. Quimby, Assaf Horesh, Branimir Sesar, Assaf Sternberg

Research output: Contribution to journalReview articlepeer-review

Abstract

We present extensive photometric and spectroscopic observations of PTF1J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar binaries with some of the smallest separations known and orbital periods ranging from 5 to 65 minutes. They are believed to be composed of a white dwarf accretor and a (semi-)degenerate He-rich donor and are considered to be the helium equivalents of cataclysmic variables (CVs). We have spectroscopically and photometrically identified an orbital period of 26.77 0.02 minutes for PTF1J071912.13+485834.0 and found a super-outburst recurrence time of greater than 65 days along with the presence of "normal" outbursts - rarely seen in AM CVn systems but well known in super-outbursting CVs. We present a long-term light curve over two super-cycles as well as high-cadence photometry of both outburst and quiescent stages, both of which show clear variability. We also compare both the outburst and quiescent spectra of PTF1J071912.13+485834.0 to other known AM CVn systems, and use the quiescent phase-resolved spectroscopy to determine the origin of the photometric variability. Finally, we draw parallels between the different subclasses of SU UMa-type CVs and outbursting AM CVn systems. We conclude by predicting that the PTF may more than double the number of outbursting AM CVn systems known, which would greatly increase our understanding of AM CVn systems.

Original languageEnglish
Article number68
JournalAstrophysical Journal
Volume739
Issue number2
DOIs
StatePublished - 1 Oct 2011
Externally publishedYes

Keywords

  • accretion
  • accretion disks
  • binaries: close
  • cataclysmic variables
  • novae
  • white dwarfs

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