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
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866916953163038720 |
|---|---|
| author | Uyama, Taichi Kuzuhara, Masayuki Beichman, Charles Hirano, Teruyuki Kotani, Takayuki An, Qier Brandt, Timothy D. Janson, Markus Mawet, Dimitri Mori, Mayuko Sato, Bun'Ei Stoeva, Denitza Tamura, Motohide Aizawa, Masataka Cale, Bryson Henning, Thomas Ishikawa, Hiroyuki Tako Narita, Norio Ogihara, Masahiro Sanghi, Aniket Trifonov, Trifon Xuan, Jerry Akiyama, Eiji Harakawa, Hiroki Hodapp, Klaus Ishizuka, Masato Jacobson, Shane Kokubo, Eiichiro Konishi, Mihoko Kudo, Tomoyuki Kurokawa, Takashi Kwon, Jungmi Nishikawa, Jun Omiya, Masashi Serizawa, Takuma Teng, Huan-Yu Ueda, Akitoshi Vievard, Sebastien |
| author_facet | Uyama, Taichi Kuzuhara, Masayuki Beichman, Charles Hirano, Teruyuki Kotani, Takayuki An, Qier Brandt, Timothy D. Janson, Markus Mawet, Dimitri Mori, Mayuko Sato, Bun'Ei Stoeva, Denitza Tamura, Motohide Aizawa, Masataka Cale, Bryson Henning, Thomas Ishikawa, Hiroyuki Tako Narita, Norio Ogihara, Masahiro Sanghi, Aniket Trifonov, Trifon Xuan, Jerry Akiyama, Eiji Harakawa, Hiroki Hodapp, Klaus Ishizuka, Masato Jacobson, Shane Kokubo, Eiichiro Konishi, Mihoko Kudo, Tomoyuki Kurokawa, Takashi Kwon, Jungmi Nishikawa, Jun Omiya, Masashi Serizawa, Takuma Teng, Huan-Yu Ueda, Akitoshi Vievard, Sebastien |
| contents | We report the discovery of a new directly-imaged brown dwarf companion with Keck/NIRC2+pyWFS around a nearby mid-type M~dwarf LSPM~J1446+4633 (hereafter J1446). The $L'$-band contrast ($4.5\times10^{-3}$) is consistent with a $\sim20-60\ M_{\rm Jup}$ object at 1--10~Gyr and our two-epoch NIRC2 data suggest a $\sim30\%$ ($\sim3.1σ)$ variability in its $L'$-band flux. We incorporated Gaia DR3 non-single-star catalog into the orbital fitting by combining the Subaru/IRD RV monitoring results, NIRC2 direct imaging results, and Gaia proper motion acceleration. As a result, we derive ${59.8}_{-1.4}^{+1.5}\ M_{\rm Jup}$ and $\approx4.3~{\rm au}$ for the dynamical mass and the semi-major axis of the companion J1446B, respectively. J1446B is one of the intriguing late-T~dwarfs showing variability at $L'$-band for future atmospheric studies with the constrained dynamical mass. Because the J1446 system is accessible with various observation techniques such as astrometry, direct imaging, and high-resolution spectroscopy including radial velocity measurement, it has a potential as a great benchmark system to improve our understanding for cool dwarfs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_13587 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 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 Uyama, Taichi Kuzuhara, Masayuki Beichman, Charles Hirano, Teruyuki Kotani, Takayuki An, Qier Brandt, Timothy D. Janson, Markus Mawet, Dimitri Mori, Mayuko Sato, Bun'Ei Stoeva, Denitza Tamura, Motohide Aizawa, Masataka Cale, Bryson Henning, Thomas Ishikawa, Hiroyuki Tako Narita, Norio Ogihara, Masahiro Sanghi, Aniket Trifonov, Trifon Xuan, Jerry Akiyama, Eiji Harakawa, Hiroki Hodapp, Klaus Ishizuka, Masato Jacobson, Shane Kokubo, Eiichiro Konishi, Mihoko Kudo, Tomoyuki Kurokawa, Takashi Kwon, Jungmi Nishikawa, Jun Omiya, Masashi Serizawa, Takuma Teng, Huan-Yu Ueda, Akitoshi Vievard, Sebastien Solar and Stellar Astrophysics Earth and Planetary Astrophysics We report the discovery of a new directly-imaged brown dwarf companion with Keck/NIRC2+pyWFS around a nearby mid-type M~dwarf LSPM~J1446+4633 (hereafter J1446). The $L'$-band contrast ($4.5\times10^{-3}$) is consistent with a $\sim20-60\ M_{\rm Jup}$ object at 1--10~Gyr and our two-epoch NIRC2 data suggest a $\sim30\%$ ($\sim3.1σ)$ variability in its $L'$-band flux. We incorporated Gaia DR3 non-single-star catalog into the orbital fitting by combining the Subaru/IRD RV monitoring results, NIRC2 direct imaging results, and Gaia proper motion acceleration. As a result, we derive ${59.8}_{-1.4}^{+1.5}\ M_{\rm Jup}$ and $\approx4.3~{\rm au}$ for the dynamical mass and the semi-major axis of the companion J1446B, respectively. J1446B is one of the intriguing late-T~dwarfs showing variability at $L'$-band for future atmospheric studies with the constrained dynamical mass. Because the J1446 system is accessible with various observation techniques such as astrometry, direct imaging, and high-resolution spectroscopy including radial velocity measurement, it has a potential as a great benchmark system to improve our understanding for cool dwarfs. |
| title | 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 |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2509.13587 |