Periodicities in the K2 light curve of HP Librae

Author:

Solanki Siddhant1,Kupfer Thomas23,Blaes Omer1ORCID,Breedt Elmé4ORCID,Scaringi Simone35ORCID

Affiliation:

1. Physics Department, University of California, Santa Barbara, CA 93106, USA

2. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA

3. Department of Physics and Astronomy, Texas Tech University, PO Box 41051, Lubbock, TX 79409, USA

4. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

5. Centre for Extragalactic Astronomy, Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK

Abstract

ABSTRACT We analyse Kepler/K2 light-curve data of the AM CVn system HP Librae (HP Lib). We detect with confidence four photometric periodicities in the system: the orbital frequency, both positive and negative superhumps, and the positive apsidal precession frequency of the accretion disc. This is only the second time that the apsidal precession frequency has ever been directly detected in the photometry of a helium accreting system, after SDSS J135154.46-064309.0. We present phase-folded light curves and sliding power spectra of each of the four periodicities. We measure rates of change of the positive superhump period of ∼10−7 d. We also redetect a quasi-periodic oscillation (QPO) at ∼300 cyc d–1, a feature that has been stable over decades, and show that it is harmonically related to two other QPOs, the lowest of which is centred on the superhump/orbital frequency. The continuum power spectrum is consistent with a single power law with no evidence of any breaks within our observed frequency range.

Funder

National Science Foundation

National Aeronautics and Space Administration

Science and Technology Facilities Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. TIC 378898110: A bright, short-period AM CVn binary in TESS;Monthly Notices of the Royal Astronomical Society;2023-11-03

2. Astrophysics with the Laser Interferometer Space Antenna;Living Reviews in Relativity;2023-03-14

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