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A 15.7-minute AM CVn binary discovered in K2
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Green, Matthew J., Hermes, J. J., Marsh, Tom, Steeghs, D., Bell, Keaton J., Littlefair, S. P., Parsons, S. G., Dennihy, E., Fuchs, J. T., Reding, J. S., Kaiser, B. C., Ashley, R. P., Breedt, E., Dhillon, V. S., Gentile Fusillo, N. P., Kerry, P. and Sahman, D. I. (2018) A 15.7-minute AM CVn binary discovered in K2. Monthly Notices of the Royal Astronomical Society , 477 (4). pp. 5646-5656. doi:10.1093/mnras/sty1032 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/sty1032
Abstract
We present the discovery of SDSS J135154.46−064309.0, a short-period variable observed using 30-mincadence photometry in K2 Campaign 6. Follow-up spectroscopy and high-speed photometry support a classification as a new member of the rare class of ultracompact accreting binaries known as AM CVn stars. The spectroscopic orbital period of 15.65 ± 0.12 min makes this system the fourth-shortest-period AM CVn known, and the second system of this type to be discovered by the Kepler spacecraft. The K2 data show photometric periods at 15.7306 ± 0.0003 min, 16.1121 ± 0.0004 min, and 664.82 ± 0.06 min, which we identify as the orbital period, superhump period, and disc precession period, respectively. From the superhump and orbital periods we estimate the binary mass ratio q = M2/M1= 0.111 ± 0.005, though this method of mass ratio determination may not be well calibrated for helium-dominated binaries. This system is likely to be a bright foreground source of gravitational waves in the frequency range detectable by Laser Interferometer Space Antenna, and may be of use as a calibration source if future studies are able to constrain the masses of its stellar components.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Dwarf novae, Cataclysmic variable stars, White dwarf stars | |||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 0035-8711 | |||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 11 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 477 | |||||||||||||||||||||||||||||||||||||||||||||
Number: | 4 | |||||||||||||||||||||||||||||||||||||||||||||
Page Range: | pp. 5646-5656 | |||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1093/mnras/sty1032 | |||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 12 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 12 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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