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Beichman, Eiichiro Kokubo, Eiji Kambe, Eugene Serabyn, Hajime Kawahara, Hideyuki Izumiura, Hiroki Harakawa, Hiroyuki Tako Ishikawa, Ji Wang, John Livingston, John Wisniewski, Jungmi Kwon, Jun Nishikawa, Klaus Hodapp, Koyu Mitsui, Markus Janson, Masahiro Ogihara, Masashi Omiya, Masato Ishizuka, Masayuki Kuzuhara, Michael W. McElwain, Mihoko Konishi, Motohide Tamura, Nobuhiko Kusakabe, Norio Narita, S\\'ebastien Vievard, Shane Jacobson, Stevanus K. Nugroho, Taichi Uyama, Takanori Kodama, Takao Nakagawa, Takashi Kurokawa, Takayuki Kotani, Takuma Serizawa, Takuya Takarada, Teruyuki Hirano, Thayne Currie, Thomas Henning, Timothy D. Brandt, Tomoyuki Kudo, Vigneshwaran Krishnamurthy, Wako Aoki, Yasunori Hori, Yui Kasagi, Yuji Matsumoto","submitted_at":"2022-05-24T11:34:00Z","abstract_excerpt":"We report the near-infrared radial-velocity (RV) discovery of a super-Earth planet on a 10.77-day orbit around the M4.5 dwarf Ross 508 ($J_\\mathrm{mag}=9.1$). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of $3.92^{+0.60}_{-0.58}$ ${\\rm m\\,s}^{-1}$, corresponding to a planet with a minimum mass $m \\sin i = 4.00^{+0.53}_{-0.55}\\ M_{\\oplus}$. We find no evidence of significant signals at the detected period in spectroscopic stellar activity indicators or MEarth photometry. 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Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of $3.92^{+0.60}_{-0.58}$ ${\\rm m\\,s}^{-1}$, corresponding to a planet with a minimum mass $m \\sin i = 4.00^{+0.53}_{-0.55}\\ M_{\\oplus}$. We find no evidence of significant signals at the detected period in spectroscopic stellar activity indicators or MEarth photometry. 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