Exoplanets around Low-mass Stars Unveiled by K2

@article{Hirano2017ExoplanetsAL,  title={Exoplanets around Low-mass Stars Unveiled by K2},  author={Teruyuki Hirano and Fei Dai and Davide Gandolfi and Akihiko Fukui and John H. Livingston and Kohei Miyakawa and Michael Endl and William D. Cochran and F. J. Alonso-Floriano and Masayuki Kuzuhara and David Montes and Tsuguru Ryu and Simon H. Albrecht and Oscar Barrag{\'a}n and Juan Cabrera and Sz. Csizmadia and Hans J. Deeg and Ph. Eigm{\"u}ller and Anders Erikson and Malcolm Fridlund and Sascha Grziwa and E. W. Guenther and A. P. Hatzes and J. Korth and Tomoyuki Kudo and Nobuhiko Kusakabe and Norio Narita and David Nespral and Grzegorz Nowak and Martin P{\"a}tzold and Enric Pall{\'e} and Carina M. Persson and Jorge Prieto-Arranz and Heike Rauer and Ignasi Ribas and Bun’ei Sato and Alexis M. S. Smith and Motohide Tamura and Yusuke Tanaka and Vincent Van Eylen and Joshua N. Winn},  journal={The Astronomical Journal},  year={2017},  volume={155},  url={https://api.semanticscholar.org/CorpusID:54590874}}
We present the detection and follow-up observations of planetary candidates around low-mass stars observed by the K2 mission. Based on light-curve analysis, adaptive-optics imaging, and optical spectroscopy at low and high resolution (including radial velocity measurements), we validate 16 planets around 12 low-mass stars observed during K2 campaigns 5–10. Among the 16 planets, 12 are newly validated, with orbital periods ranging from 0.96 to 33 days. For one of the planets (K2-151b), we… 

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125 References

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