Three Small Planets Transiting a Hyades Star [EPA]

We present the discovery of three small planets transiting LP 358-348, a late K dwarf in the Hyades. The planets have orbital periods of $7.9757 \pm 0.0011$, $17.30681^{+0.00034}{-0.00036}$, and $25.5715^{+0.0038}{-0.0040}$ days, and radii of $1.05 \pm 0.16$, $3.14 \pm 0.36$, and $1.55^{+0.24}{-0.21}$ $R\oplus$, respectively. With an age of 600-800 Myr, these planets are some of the smallest and youngest transiting planets known. Due to the relatively bright (J=9.1) and moderately inactive host star, the planets are compelling targets for future characterization via radial velocity mass measurements and transmission spectroscopy. As the first known star with multiple transiting planets in a cluster, the system should be helpful for testing theories of planet formation and migration.

Read this paper on arXiv…

J. Livingston, F. Dai, T. Hirano, et. al.
Fri, 20 Oct 17

Comments: 14 pages, 10 figures, 5 tables. Submitted to AAS Journals