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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, 17.30681-0.00036+0.00034, and 25.5715-0.0040+0.0038 days, and radii of 1.05 ± 0.16, 3.14 ± 0.36, and 1.55-0.21+0.24 R_Earth , 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) 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.

Three Small Planets Transiting a Hyades Star

Gandolfi, Davide;Barragan, Oscar;
2018-01-01

Abstract

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, 17.30681-0.00036+0.00034, and 25.5715-0.0040+0.0038 days, and radii of 1.05 ± 0.16, 3.14 ± 0.36, and 1.55-0.21+0.24 R_Earth , 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) 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.
2018
THE ASTRONOMICAL JOURNAL
155
3
115
125
planetary systems; planets and satellites: detection; stars: individual (LP 358-348); techniques: photometric; techniques: spectroscopic
Livingston, John H.; Dai, Fei; Hirano, Teruyuki; Gandolfi, Davide; Nowak, Grzegorz; Endl, Michael; Velasco, Sergio; Fukui, Akihiko; Narita, Norio; Prieto-Arranz, Jorge; Barragan, Oscar; Cusano, Felice; Albrecht, Simon; Cabrera, Juan; Cochran, William D.; Csizmadia, Szilard; Deeg, Hans J.; Eigmüller, Philipp; Erikson, Anders; Fridlund, Malcolm; Grziwa, Sascha; Guenther, Eike W.; Hatzes, Artie P.; Kawauchi, Kiyoe; Korth, Judith; Nespral, David; Palle, Enric; Pätzold, Martin; Persson, Carina M.; Rauer, Heike; Smith, Alexis M. S.; Tamura, Motohide; Tanaka, Yusuke; Van Eylen, Vincent; Watanabe, Noriharu; Winn, Joshua N.
03A-Articolo su Rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1661316
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