Three Small Planets Transiting a Hyades Star

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<jats:title>Abstract</jats:title> <jats:p>We present the discovery of three small planets transiting K2-136 (LP 358 348, EPIC 247589423), a late K dwarf in the Hyades. The planets have orbital periods of 7.9757 ± 0.0011, <jats:inline-formula> <jats:tex-math> <?CDATA ${17.30681}_{-0.00036}^{+0.00034}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajaaa841ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math> <?CDATA ${25.5715}_{-0.0040}^{+0.0038}\,\mathrm{days}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajaaa841ieqn2.gif" xlink:type="simple" /> </jats:inline-formula>, and radii of 1.05 ± 0.16, 3.14 ± 0.36, and <jats:inline-formula> <jats:tex-math> <?CDATA ${1.55}_{-0.21}^{+0.24}\,{R}_{\oplus }$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajaaa841ieqn3.gif" xlink:type="simple" /> </jats:inline-formula>, 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 (<jats:italic>J</jats:italic> = 9.1) 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.</jats:p>

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