Long-term photometric variations in the candidate white-dwarf pulsar AR Scorpii from K2, CRTS, and ASAS-SN observations
arXiv:1707.09395 · doi:10.3847/2041-8213/aa8300
Abstract
We analyze long-cadence Kepler K2 observations of AR Sco from 2014, along with survey photometry obtained between 2005 and 2016 by the Catalina Real-Time Sky Survey and the All-Sky Automated Survey for Supernovae. The K2 data show the orbital modulation to have been fairly stable during the 78 days of observations, but we detect aperiodic deviations from the average waveform with an amplitude of ~2% on a timescale of a few days. A comparison of the K2 data with the survey photometry reveals that the orbital waveform gradually changed between 2005 and 2010, with the orbital maximum shifting to earlier phases. We compare these photometric variations with proposed models of this unusual system.
arXiv commentAccepted for publication, ApJL
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Cited by in corpus (10)
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- A non-thermal pulsed X-ray emission of AR~Scorpii
- VLA Radio Observations of AR Sco
- High-Time-Resolution Photometry of AR Scorpii: Confirmation of the White Dwarf's Spin-Down
- Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii
- A reevaluation of the proposed spin-down of the white dwarf pulsar in AR Scorpii
- Optical detection of the rapidly spinning white dwarf in V1460 Her
- Analysis of a Century's Worth of AR Scorpii Photometry from DASCH and ASAS-SN
- An X-ray study for white dwarf binary AR Scorpii
- On the Polarized Nonthermal Emission from AR Scorpii