POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914444989169664 |
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| author | Espinoza-Retamal, Juan I. Bhaskar, Hareesh Winn, Joshua N. Petrovich, Cristobal Brahm, Rafael Lammers, Caleb Stefánsson, Guðmundur Koo, Elise Jordán, Andrés Rojas, Felipe I. |
| author_facet | Espinoza-Retamal, Juan I. Bhaskar, Hareesh Winn, Joshua N. Petrovich, Cristobal Brahm, Rafael Lammers, Caleb Stefánsson, Guðmundur Koo, Elise Jordán, Andrés Rojas, Felipe I. |
| contents | We present an observation of the Rossiter-McLaughlin effect for the warm-Neptune system TOI-1710 obtained with the NEID spectrograph on the WIYN 3.5 m telescope. These observations reveal that the planet orbits in the opposite direction to the stellar spin, with a sky-projected obliquity $λ=179\pm19^{\circ}$. Combined with information about the rotation period of the host star, we measure a true obliquity of $ψ=158_{-13}^{+11}\,^{\circ}$. The host star has an M-dwarf companion at a separation of $\sim3600$ au, but this companion is too distant to be solely responsible for misaligning the warm Neptune. The host star also shows a long-term radial velocity trend, indicative of a companion at intermediate separations. We show that such a companion can dynamically couple the warm Neptune to the distant M dwarf, enabling the transfer of inclination from the wide binary orbit to the planetary orbit. Assuming this scenario is correct, we predict the intermediate companion is a $\sim5\,M_J$ planet on a $\sim15$-au orbit that is nearly aligned with the transiting planet's orbit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_03364 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b Espinoza-Retamal, Juan I. Bhaskar, Hareesh Winn, Joshua N. Petrovich, Cristobal Brahm, Rafael Lammers, Caleb Stefánsson, Guðmundur Koo, Elise Jordán, Andrés Rojas, Felipe I. Earth and Planetary Astrophysics We present an observation of the Rossiter-McLaughlin effect for the warm-Neptune system TOI-1710 obtained with the NEID spectrograph on the WIYN 3.5 m telescope. These observations reveal that the planet orbits in the opposite direction to the stellar spin, with a sky-projected obliquity $λ=179\pm19^{\circ}$. Combined with information about the rotation period of the host star, we measure a true obliquity of $ψ=158_{-13}^{+11}\,^{\circ}$. The host star has an M-dwarf companion at a separation of $\sim3600$ au, but this companion is too distant to be solely responsible for misaligning the warm Neptune. The host star also shows a long-term radial velocity trend, indicative of a companion at intermediate separations. We show that such a companion can dynamically couple the warm Neptune to the distant M dwarf, enabling the transfer of inclination from the wide binary orbit to the planetary orbit. Assuming this scenario is correct, we predict the intermediate companion is a $\sim5\,M_J$ planet on a $\sim15$-au orbit that is nearly aligned with the transiting planet's orbit. |
| title | POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2604.03364 |