Two Small Planets Transiting HD 3167
Andrew Vanderburg, Allyson Bieryla, Dmitry A. Duev, Rebecca, Jensen-Clem, David W. Latham, Andrew W. Mayo, Christoph Baranec, Perry, Berlind, Shrinivas Kulkarni, Nicholas M. Law, Megan N. Nieberding, Reed, Riddle, Maissa Salama

TL;DR
This paper reports the discovery of two transiting super-Earth planets around the nearby bright star HD 3167, highlighting their potential for follow-up studies including mass measurement and atmospheric characterization.
Contribution
First detection of two transiting super-Earths around a bright, nearby star using K2 data, with detailed characterization prospects.
Findings
Inner planet has a 0.96-day orbit and 1.6 R_e radius.
Outer planet has a 29.85-day orbit and 2.9 R_e radius.
Star HD 3167 is bright, inactive, and suitable for follow-up observations.
Abstract
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 with low rotational line-broadening, 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…
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