PLATOSpec's first results: planets WASP-35b and TOI-622b are on aligned orbits, and K2-237b is on a polar orbit
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866918124906872832 |
|---|---|
| author | Zak, J. Kabath, P. Boffin, H. M. J. Liptak, J. Skarka, M. Brahm, R. Gajdoš, P. Bocchieri, A. Itrich, D. Vanzi, L. Pintr, P. Janik, J. Hatzes, A. |
| author_facet | Zak, J. Kabath, P. Boffin, H. M. J. Liptak, J. Skarka, M. Brahm, R. Gajdoš, P. Bocchieri, A. Itrich, D. Vanzi, L. Pintr, P. Janik, J. Hatzes, A. |
| contents | The spin-orbit angle between a stellar spin axis and its planetary orbital axis is a key diagnostic of planetary migration pathways, yet the mechanisms shaping the observed spin-orbit distribution remain incompletely understood. Combining the spin-orbit angle with atmospheric measurements has emerged as a powerful method of studying exoplanets that showcases the synergy between ground- and space-based observations. We present the Rossiter-McLaughlin effect measurements of the projected spin-orbit angle ($λ$) for three gaseous exoplanets using the newly commissioned PLATOSpec instrument on the E152 Telescope at La Silla Observatory. For WASP-35b, we determine $λ= 1_{-18}^{+19}$ deg, demonstrating PLATOSpec's capabilities through excellent agreement with HARPS-N literature data. We provide the first spin-orbit measurements for TOI-622b ($λ=-4 \pm 12$ deg, true spin-orbit angle $ψ= $16.1$^{+8.0}_{-9.7}$ deg), revealing an aligned orbit consistent with quiescent disc migration. For K2-237b, we find $λ= 91 \pm 7$ deg and $ψ= $90.5$^{+6.8}_{-6.2}$ deg, indicating a nearly perfect polar orbit, which suggests a history consistent with disc-free migration, contrasting previous studies inferring disc migration. TOI-622b populates a sparsely populated region of sub-Jovian planets with measured spin-orbit angles orbiting stars above the Kraft break, while K2-237b's polar configuration strengthens tentative evidence for preferential orbital orientations. All three systems are compelling targets for future atmospheric characterization, where these dynamical constraints will be vital for a comprehensive understanding of their formation and evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_10145 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | PLATOSpec's first results: planets WASP-35b and TOI-622b are on aligned orbits, and K2-237b is on a polar orbit Zak, J. Kabath, P. Boffin, H. M. J. Liptak, J. Skarka, M. Brahm, R. Gajdoš, P. Bocchieri, A. Itrich, D. Vanzi, L. Pintr, P. Janik, J. Hatzes, A. Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics The spin-orbit angle between a stellar spin axis and its planetary orbital axis is a key diagnostic of planetary migration pathways, yet the mechanisms shaping the observed spin-orbit distribution remain incompletely understood. Combining the spin-orbit angle with atmospheric measurements has emerged as a powerful method of studying exoplanets that showcases the synergy between ground- and space-based observations. We present the Rossiter-McLaughlin effect measurements of the projected spin-orbit angle ($λ$) for three gaseous exoplanets using the newly commissioned PLATOSpec instrument on the E152 Telescope at La Silla Observatory. For WASP-35b, we determine $λ= 1_{-18}^{+19}$ deg, demonstrating PLATOSpec's capabilities through excellent agreement with HARPS-N literature data. We provide the first spin-orbit measurements for TOI-622b ($λ=-4 \pm 12$ deg, true spin-orbit angle $ψ= $16.1$^{+8.0}_{-9.7}$ deg), revealing an aligned orbit consistent with quiescent disc migration. For K2-237b, we find $λ= 91 \pm 7$ deg and $ψ= $90.5$^{+6.8}_{-6.2}$ deg, indicating a nearly perfect polar orbit, which suggests a history consistent with disc-free migration, contrasting previous studies inferring disc migration. TOI-622b populates a sparsely populated region of sub-Jovian planets with measured spin-orbit angles orbiting stars above the Kraft break, while K2-237b's polar configuration strengthens tentative evidence for preferential orbital orientations. All three systems are compelling targets for future atmospheric characterization, where these dynamical constraints will be vital for a comprehensive understanding of their formation and evolution. |
| title | PLATOSpec's first results: planets WASP-35b and TOI-622b are on aligned orbits, and K2-237b is on a polar orbit |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2508.10145 |