The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf
The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf
Sub-Neptunes are small planets between the size of the Earth and Neptune. The orbital and bulk properties of transiting sub-Neptunes can provide clues for their formation and evolution of small planets. In this paper, we report on follow-up observations of a planetary system around the mid-M dwarf TOI-654, whose transiting sub-Neptune TOI-654 b ($P=1.53$ day) is validated as a suitable target for the atmospheric observation. We measure the planetary mass and stellar properties with the InfraRed Doppler instrument (IRD) mounted on the Subaru telescope and obtain the stellar and planetary properties from additional transit observations by the Transit Exoplanetary Survey Satellite (TESS) and a series of the Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT). As a result, the planetary mass of TOI-654 b is determined to be $M_{\rm p} = 8.71 \pm 1.25 M_{\oplus}$, and the radius is updated to be $R_{\rm p} = 2.378 \pm 0.089 R_{\oplus}$. The bulk density suggests that the planet is composed of a rocky and volatile-rich core or a rocky core surrounded by a small amount of H/He envelope.TOI-654 b is one of unique planets located around the radius valley and and also on the outer edge of the Neptune desert. The precise mass determination enables us to constrain the atmospheric properties with future spectroscopic observations especially for the emission by the James Webb Space Telescope and Ariel.
Yujie Zou、Takayuki Kotani、Motohide Tamura、Kai Ikuta、Norio Narita、Takuya Takarada、Teruyuki Hirano、Akihiko Fukui、Hiroyuki Tako Ishikawa、Yasunori Hori、Tadahiro Kimura、Takanori Kodama、Masahiro Ikoma、Jerome P. de Leon、Kiyoe Kawauchi、Masayuki Kuzuhara、Gaia Lacedelli、John H. Livingston、Mayuko Mori、Felipe Murgas、Enric Palle、Hannu Parviainen、Noriharu Watanabe、Izuru Fukuda、Hiroki Harakawa、Yuya Hayashi、Klaus Hodapp、Keisuke Isogai、Taiki Kagetani、Yugo Kawai、Vigneshwaran Krishnamurthy、Tomoyuki Kudo、Takashi Kurokawa、Nobuhiko Kusakabe、Jun Nishikawa、Stevanus K. Nugroho、Masashi Omiya、Takuma Serizawa、Aoi Takahashi、Huan-Yu Teng、Yuka Terada、Akitoshi Ueda、Sébastien Vievard
天文学
Yujie Zou,Takayuki Kotani,Motohide Tamura,Kai Ikuta,Norio Narita,Takuya Takarada,Teruyuki Hirano,Akihiko Fukui,Hiroyuki Tako Ishikawa,Yasunori Hori,Tadahiro Kimura,Takanori Kodama,Masahiro Ikoma,Jerome P. de Leon,Kiyoe Kawauchi,Masayuki Kuzuhara,Gaia Lacedelli,John H. Livingston,Mayuko Mori,Felipe Murgas,Enric Palle,Hannu Parviainen,Noriharu Watanabe,Izuru Fukuda,Hiroki Harakawa,Yuya Hayashi,Klaus Hodapp,Keisuke Isogai,Taiki Kagetani,Yugo Kawai,Vigneshwaran Krishnamurthy,Tomoyuki Kudo,Takashi Kurokawa,Nobuhiko Kusakabe,Jun Nishikawa,Stevanus K. Nugroho,Masashi Omiya,Takuma Serizawa,Aoi Takahashi,Huan-Yu Teng,Yuka Terada,Akitoshi Ueda,Sébastien Vievard.The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf[EB/OL].(2025-07-22)[2025-08-10].https://arxiv.org/abs/2507.16222.点此复制
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