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Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program II; Discovery of a Brown-dwarf Companion around a Nearby Mid-M-dwarf LSPM J1446+4633

  • Authors: Taichi Uyama, Masayuki Kuzuhara, Charles Beichman, Teruyuki Hirano, Takayuki Kotani, Qier An, Timothy D. Brandt, Markus Janson, Dimitri Mawet, Mayuko Mori, Bun'ei Sato, Denitza Stoeva, Motohide Tamura, Masataka Aizawa, Bryson Cale, Thomas Henning, Hiroyuki Tako Ishikawa, Norio Narita, Masahiro Ogihara, Aniket Sanghi, Trifon Trifonov, Jerry Xuan, Eiji Akiyama, Hiroki Harakawa, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Eiichiro Kokubo, Mihoko Konishi, Tomoyuki Kudo, Takashi Kurokawa, Jungmi Kwon, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Huan-Yu Teng, Akitoshi Ueda, Sebastien Vievard

Taichi Uyama et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 5.

Left: modeled projected orbits of J1446B from fitting the Gaia DR3 acceleration (a red arrow in left) and two measured Keck/NIRC2 relative astrometric measurements (blue dots in left), and Subaru/IRD RVs (red dots in right). The host star defines the origin and is indicated by a black star; one hundred random orbital draws are shown and color coded by companion mass, with the best-fit orbit (black). The fitted offset at 2016.0 is plotted in red, and the direction of the measured Gaia DR3 acceleration is indicated by the red arrow. Right: modeled RVs from a random sampling of orbits from the posterior are color coded by companion mass with the best-fit orbit.

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