A super-Earth orbiting near the inner edge of the habitable zone around the M4.5 dwarf Ross 508

We report the near-infrared radial velocity (RV) discovery of a super-Earth planet on a 10.77 d orbit around the M4.5 dwarf Ross 508 (Jmag = 9.1). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of 3.92ms−1⁠, corresponding to a planet with a minimum mass msini=4.00M⊕⁠. We find no evidence of significant signals at the detected period in spectroscopic stellar activity indicators or MEarth photometry. The planet, Ross 508 b, has a semi-major axis of 0.05366au. This gives an orbit-averaged insolation of ≈1.4 times the Earth’s value, placing Ross 508 b near the inner edge of its star’s habitable zone. We have explored the possibility that the planet has a high eccentricity and its host is accompanied by an additional unconfirmed companion on a wide orbit. Our discovery demonstrates that the near-infrared RV search can play a crucial role in finding a low-mass planet around cool M dwarfs like Ross 508.

Takarada, Takuya (author)
Kasagi, Yui (author)
Hirano, Teruyuki (author)
Kotani, Takayuki (author)
Kuzuhara, Masayuki (author)
Omiya, Masashi (author)
Kawahara, Hajime (author)
Fukui, Akihiko (author)
Hori, Yasunori (author)
Ishikawa, Hiroyuki Tako (author)
Ogihara, Masahiro (author)
Livingston, John (author)
Brandt, Timothy D. (author)
Currie, Thayne (author)
Aoki, Wako (author)
Beichman, Charles A. (author)
Henning, Thomas (author)
Hodapp, Klaus (author)
Ishizuka, Masato (author)
Izumiura, Hideyuki (author)
Jacobson, Shane (author)
Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso (author)
Kambe, Eiji (author)
Kodama, Takanori (author)
Kokubo, Eiichiro (author)
Konishi, Mihoko (author)
Krishnamurthy, Vigneshwaran (author)
Kudo, Tomoyuki (author)
Kurokawa, Takashi (author)
Kusakabe, Nobuhiko (author)
Kwon, Jungmi (author)
Matsumoto, Yuji (author)
McElwain, Michael W. (author)
Mitsui, Koyu (author)
Nakagawa, Takao (author)
Narita, Norio (author)
Nishikawa, Jun (author)
Nugroho, Stevanus K. (author)
Serabyn, Eugene (author)
Serizawa, Takuma (author)
Takahashi, Aoi (author)
Ueda, Akitoshi (author)
Uyama, Taichi (author)
Vievard, Sébastien (author)
Wang, Ji (author)
Wisniewski, John (author)
Tamura, Motohide (author)
Sato, Bun'ei (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

In:Publications of the Astronomical Society of Japan: Oxford University Press (OUP)74:4, s. 904-9220004-62642053-051X

By the author/editor: Harakawa, Hiroki; Takarada, Takuya; Kasagi, Yui; Hirano, Teruyuki; Kotani, Takayuki; Kuzuhara, Masayu ...; show more...; Omiya, Masashi; Kawahara, Hajime; Fukui, Akihiko; Hori, Yasunori; Ishikawa, Hiroyu ...; Ogihara, Masahir ...; Livingston, John; Brandt, Timothy ...; Currie, Thayne; Aoki, Wako; Beichman, Charle ...; Henning, Thomas; Hodapp, Klaus; Ishizuka, Masato; Izumiura, Hideyu ...; Jacobson, Shane; Janson, Markus; Kambe, Eiji; Kodama, Takanori; Kokubo, Eiichiro; Konishi, Mihoko; Krishnamurthy, V ...; Kudo, Tomoyuki; Kurokawa, Takash ...; Kusakabe, Nobuhi ...; Kwon, Jungmi; Matsumoto, Yuji; McElwain, Michae ...; Mitsui, Koyu; Nakagawa, Takao; Narita, Norio; Nishikawa, Jun; Nugroho, Stevanu ...; Serabyn, Eugene; Serizawa, Takuma; Takahashi, Aoi; Ueda, Akitoshi; Uyama, Taichi; Vievard, Sébasti ...; Wang, Ji; Wisniewski, John; Tamura, Motohide; Sato, Bun'ei; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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