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HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography

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Abstract

  • We report the discovery of HAT-P-67b, which is a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of {R}{{p}}={2.085}-0.071 0.096 {R}{{J}}, and orbites a {M}* ={1.642}-0.072 0.155 {M}, {R}* ={2.546}-0.084 0.099 {R} host star in a ˜4.81 day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be {M}{{p}}}}{{J}}, and a lower limit of > 0.056 {M}{{J}} by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid rotation, with a projected rotational velocity of v\sin {I}\star =35.8 /- 1.1 {km} {{{s}}}-1, which makes it difficult to precisely determine the mass of the planet using radial velocities. We validated HAT-P-67b via two Doppler tomographic detections of the planetary transit, which eliminate potential eclipsing binary blend scenarios. The Doppler tomographic observations also confirm that HAT-P-67b has an orbit that is aligned to within 12°, in projection, with the spin of its host star. HAT-P-67b receives strong

Publication Date

  • 2017

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