KIC 2831097 – a 2-yr-orbital-period RR Lyrae binary candidate

Sódor, Ádám and Skarka, Marek and Liška, J. and Sódorné Bognár, Zsófia (2017) KIC 2831097 – a 2-yr-orbital-period RR Lyrae binary candidate. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 465 (1). L1-L5. ISSN 0035-8711

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Abstract

We report the discovery of a new Kepler first-overtone RR Lyrae pulsator, KIC 2831097. The pulsation shows large, 0.1 d amplitude, systematic phase variations that can be interpreted as light travel-time effect caused by orbital motion in a binary system, superimposed on a linear pulsation-period decrease. The assumed eccentric (e=0.47) orbit with the period of approximately 2 yr is the shortest among the non-eclipsing RR Lyrae binary candidates. The binary model gives a lowest estimate for the mass of the companion of 8.4 M_Sun, that places it among black hole candidates. Beside the first-overtone pulsation, numerous additional non-radial pulsation frequencies were also identified. We detected an ~47-d Blazhko-like irregular light-curve modulation.

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