A planet in an 840-d orbit around a Kepler main-sequence A star found from phase modulation of its pulsations

Abstract

We have detected a 12 M${}_{\mathrm{Jup}}$ planet orbiting in or near the habitable zone of a main-sequence A star via the pulsational phase shifts induced by orbital motion. The planet has an orbital period of $840\pm 20$ d and an eccentricity of 0.15. All known planets orbiting main-sequence A stars have been found via the transit method or by direct imaging. The absence of astrometric or radial-velocity detections of planets around these hosts makes ours the first discovery using the orbital motion. It is also the first A star known to host a planet within 1$\sigma$ of the habitable zone. We find evidence for planets in a large fraction of the parameter space where we are able to detect them. This supports the idea that A stars harbor high-mass planets in wide orbits.

arXiv commentAccepted for publication in ApJL. Colour figures are suitable for grey-scale printing. v2 corrects an eps bounding-box issue

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