HD 3167 - Two transiting super-Earths around V = 8.94 star

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HD 3167 - Two transiting super-Earths around V = 8.94 star

Post by Sirius_Alpha on 18th July 2016, 8:29 pm

Two Small Planets Transiting HD 3167
http://arxiv.org/abs/1607.05248

We report the discovery of two super-Earth-sized planets transiting the bright (V = 8.94, K = 7.07) nearby late G-dwarf HD 3167, using data collected by the K2 mission. The inner planet, HD 3167 b, has a radius of 1.6 R_e and an ultra-short orbital period of only 0.96 days. The outer planet, HD 3167 c, has a radius of 2.9 R_e and orbits its host star every 29.85 days. At a distance of just 45.8 +/- 2.2 pc, HD 3167 is one of the closest and brightest stars hosting multiple transiting planets, making HD 3167 b and c well suited for follow-up observations. The star is chromospherically inactive and slowly rotating, ideal for radial velocity observations to measure the planets' masses. The outer planet is large enough that it likely has a thick gaseous envelope which could be studied via transmission spectroscopy. Planets transiting bright, nearby stars like HD 3167 are valuable objects to study leading up to the launch of the James Webb Space Telescope.

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Re: HD 3167 - Two transiting super-Earths around V = 8.94 star

Post by Shellface on 19th July 2016, 5:39 pm

The Campaign 8 data was released on the 1st of this month. That's discovery, follow-up, writing, submission, and publication in under 3 weeks.

This system seems quite similar to Kepler-10, but ~2.5 magnitudes brighter. The star is inactive, so I expect strong mass measurements will be published within a couple of years.

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Re: HD 3167 - Two transiting super-Earths around V = 8.94 star

Post by tommi59 on 20th July 2016, 3:27 am

Well we do not need really to wait for RV measurement .First planet is so close that surely lost all volatiles and water if it ever had being dense rocky world and second is too large and surely has low density and thick atmosphere

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Re: HD 3167 - Two transiting super-Earths around V = 8.94 star

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