A Super-Earth Orbiting Near the Inner Edge of the Habitable Zone around the M4.5-dwarf Ross 508
| Autor: | Harakawa, Hiroki, Takarada, Takuya, Kasagi, Yui, Hirano, Teruyuki, Kotani, Takayuki, Kuzuhara, Masayuki, Omiya, Masashi, Kawahara, Hajime, Fukui, Akihiko, Hori, Yasunori, Ishikawa, Hiroyuki Tako, Ogihara, Masahiro, Livingston, John, Brandt, Timothy D., Currie, Thayne, Aoki, Wako, Beichman, Charles A., Henning, Thomas, Hodapp, Klaus, Ishizuka, Masato, Izumiura, Hideyuki, Jacobson, Shane, Janson, Markus, Kambe, Eiji, Kodama, Takanori, Kokubo, Eiichiro, Konishi, Mihoko, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kwon, Jungmi, Matsumoto, Yuji, McElwain, Michael W., Mitsui, Koyu, Nakagawa, Takao, Narita, Norio, Nishikawa, Jun, Nugroho, Stevanus K., Serabyn, Eugene, Serizawa, Takuma, Takahashi, Aoi, Ueda, Akitoshi, Uyama, Taichi, Vievard, Sébastien, Wang, Ji, Wisniewski, John, Tamura, Motohide, Sato, Bun'ei |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/pasj/psac044 |
| Popis: | 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. The planet, Ross 508 b, has a semimajor-axis of $0.05366^{+0.00056}_{-0.00049}$ au. This gives an orbit-averaged insolation of $\approx$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 to find a low-mass planet around cool M dwarfs like Ross 508. Comment: Accepted for publication in PASJ (May 23, 2022) |
| Databáze: | arXiv |
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