The Polar Catalysmic Variable 1RXS J173006.4+033813

Creators: Bhalerao, Varun B.; van Kerkwijk, Marten H.; Harrison, Fiona A.; Kasliwal, Mansi M.; Kulkarni, S. R.; Rana, Vikram R.

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Abstract

We report the discovery of 1RXS J173006.4+033813, a polar cataclysmic variable with a period of 120.21 minutes. The white dwarf primary has a magnetic field of B = 42^(+6)_(-5) MG and the secondary is an M3 dwarf. The system shows highly symmetric double-peaked photometric modulation in the active state as well as in quiescence. These arise from a combination of cyclotron beaming and ellipsoidal modulation. The projected orbital velocity of the secondary is K_2 = 390 ± 4 km s^(–1). We place an upper limit of 830 ± 65 pc on the distance.

Additional Information

© 2010 The American Astronomical Society. Received 2010 January 27; accepted 2010 July 27; published 2010 August 27. We sincerely thank the anonymous referee for detailed comments on the paper. We thank N. Gehrels for approving the Target of Opportunity observation with Swift and the Swift team for executing the observation. We also thank V. Anupama, L. Bildsten, T. Marsh, G. Nelemans, E. Ofek, and P. Szkody for useful discussions while writing the paper. This research has benefitted from the M, L, and T dwarf compendium housed at DwarfArchives.org and maintained by Chris Gelino, Davy Kirkpatrick, and Adam Burgasser. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. Facilities: PO:1.5m, Hale (LFC, DBSP), Keck:I (LRIS), Keck:II (NIRSPEC), Swift

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