Kepler-289 / PH3, Multi-planet system with measured densities

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Kepler-289 / PH3, Multi-planet system with measured densities

Post by Sirius_Alpha on 29th October 2014, 9:05 pm

Planet Hunters VII. Discovery of a New Low-Mass, Low-Density Planet (PH3 c) Orbiting Kepler-289 with Mass Measurements of Two Additional Planets (PH3 b and d)
http://arxiv.org/abs/1410.8114

We report the discovery of one newly confirmed planet (P=66.06 days, RP=2.680.17R⊕) and mass determinations of two previously validated Kepler planets, Kepler-289 b (P=34.55 days, RP=2.150.10R⊕) and Kepler-289-c (P=125.85 days, RP=11.590.10R⊕), through their transit timing variations (TTVs). We also exclude the possibility that these three planets reside in a 1:2:4 Laplace resonance. The outer planet has very deep (∼1.3), high signal-to-noise transits, which puts extremely tight constraints on its host star's stellar properties via Kepler's Third Law. The star PH3 is a young (∼1 Gyr as determined by isochrones and gyrochronology), Sun-like star with M∗=1.080.02M⊙, R∗=1.000.02R⊙, and Teff=599038 K. The middle planet's large TTV amplitude (∼5 hours) resulted either in non-detections or inaccurate detections in previous searches. A strong chopping signal, a shorter period sinusoid in the TTVs, allows us to break the mass-eccentricity degeneracy and uniquely determine the masses of the inner, middle, and outer planets to be M=7.36.8M⊕, 4.00.9M⊕, and M=13217M⊕, which we designate PH3 b, c, and d, respectively. Furthermore, the middle planet, PH3 c, has a relatively low density, ρ=1.20.3 g/cm3 for a planet of its mass, requiring a substantial H/He atmosphere of 2.1+0.8−0.3 by mass, and joins a growing population of low-mass, low-density planets.

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Re: Kepler-289 / PH3, Multi-planet system with measured densities

Post by tommi59 on 30th October 2014, 10:05 am

Nevertheless planet b is quite dense receiving much smaller stellar insolation than kepler 11 b
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Re: Kepler-289 / PH3, Multi-planet system with measured densities

Post by Lazarus on 30th October 2014, 1:07 pm

Another case of nomenclature mismatch, PH3 d=Kepler-289 c. Not sure why they didn't bring the designations in line before publishing the paper.
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Re: Kepler-289 / PH3, Multi-planet system with measured densities

Post by Lazarus on 20th November 2014, 7:50 pm

Unsurprisingly it has been added to the NASA archive as Kepler-289 d.
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Re: Kepler-289 / PH3, Multi-planet system with measured densities

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