The star HIP 41378 potentially misaligned with its cohort of long-period planets

Fuente: arXiv

Salvato in:

Dettagli Bibliografici
Autori principali:	Grouffal, S., Santerne, A., Bourrier, V., Kunovac, V., Dressing, C., Akinsanmi, B., Armstrong, C., Baliwal, S., Balsalobre-Ruza, O., Barros, S. C. C., Bayliss, D., Crossfield, I. J. M., Demangeon, O., Dumusque, X., Giacalone, S., Harada, C. K., Isaacson, H., Kellermann, H., Lillo-Box, J., Llama, J., Mortier, A., Palle, E., Rajpurohit, A. S., Rice, M., Santos, N. C., Seidel, J. V., Sharma, R., Sousa, S. G., Thomas, L., Turtelboom, E. V., Udry, S., Wheatley, P. J.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Earth and Planetary Astrophysics
Accesso online:	Acceder al recurso
Tags:	Aggiungi Tag Nessun Tag, puoi essere il primo ad aggiungerne!!

_version_	1866912589415448576
author	Grouffal, S. Santerne, A. Bourrier, V. Kunovac, V. Dressing, C. Akinsanmi, B. Armstrong, C. Baliwal, S. Balsalobre-Ruza, O. Barros, S. C. C. Bayliss, D. Crossfield, I. J. M. Demangeon, O. Dumusque, X. Giacalone, S. Harada, C. K. Isaacson, H. Kellermann, H. Lillo-Box, J. Llama, J. Mortier, A. Palle, E. Rajpurohit, A. S. Rice, M. Santos, N. C. Seidel, J. V. Sharma, R. Sousa, S. G. Thomas, L. Turtelboom, E. V. Udry, S. Wheatley, P. J.
author_facet	Grouffal, S. Santerne, A. Bourrier, V. Kunovac, V. Dressing, C. Akinsanmi, B. Armstrong, C. Baliwal, S. Balsalobre-Ruza, O. Barros, S. C. C. Bayliss, D. Crossfield, I. J. M. Demangeon, O. Dumusque, X. Giacalone, S. Harada, C. K. Isaacson, H. Kellermann, H. Lillo-Box, J. Llama, J. Mortier, A. Palle, E. Rajpurohit, A. S. Rice, M. Santos, N. C. Seidel, J. V. Sharma, R. Sousa, S. G. Thomas, L. Turtelboom, E. V. Udry, S. Wheatley, P. J.
contents	The obliquity between the stellar spin axis and the planetary orbit, detected via the Rossiter-McLaughlin (RM) effect, is a tracer of the formation history of planetary systems. While obliquity measurements have been extensively applied to hot Jupiters and short-period planets, they remain rare for cold and long-period planets due to observational challenges, particularly their long transit durations. We report the detection of the RM effect for the 19-hour-long transit of HIP 41378 f, a temperate giant planet on a 542-day orbit, observed through a worldwide spectroscopic campaign. We measure a slight projected obliquity of 21 $\pm$ 8 degrees and a significant 3D spin-orbit angle of 52 $\pm$ 6 degrees, based on the measurement of the stellar rotation period. HIP 41378 f is part of a 5-transiting planetary system with planets close to mean motion resonances. The observed misalignment likely reflects a primordial tilt of the stellar spin axis relative to the protoplanetary disk, rather than dynamical interactions. HIP 41378 f is the first non-eccentric long-period (P>100 days) planet observed with the RM effect, opening new constraints on planetary formation theories. This observation should motivate the exploration of planetary obliquities across a longer range of orbital distances through international collaboration.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_01807
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The star HIP 41378 potentially misaligned with its cohort of long-period planets Grouffal, S. Santerne, A. Bourrier, V. Kunovac, V. Dressing, C. Akinsanmi, B. Armstrong, C. Baliwal, S. Balsalobre-Ruza, O. Barros, S. C. C. Bayliss, D. Crossfield, I. J. M. Demangeon, O. Dumusque, X. Giacalone, S. Harada, C. K. Isaacson, H. Kellermann, H. Lillo-Box, J. Llama, J. Mortier, A. Palle, E. Rajpurohit, A. S. Rice, M. Santos, N. C. Seidel, J. V. Sharma, R. Sousa, S. G. Thomas, L. Turtelboom, E. V. Udry, S. Wheatley, P. J. Earth and Planetary Astrophysics The obliquity between the stellar spin axis and the planetary orbit, detected via the Rossiter-McLaughlin (RM) effect, is a tracer of the formation history of planetary systems. While obliquity measurements have been extensively applied to hot Jupiters and short-period planets, they remain rare for cold and long-period planets due to observational challenges, particularly their long transit durations. We report the detection of the RM effect for the 19-hour-long transit of HIP 41378 f, a temperate giant planet on a 542-day orbit, observed through a worldwide spectroscopic campaign. We measure a slight projected obliquity of 21 $\pm$ 8 degrees and a significant 3D spin-orbit angle of 52 $\pm$ 6 degrees, based on the measurement of the stellar rotation period. HIP 41378 f is part of a 5-transiting planetary system with planets close to mean motion resonances. The observed misalignment likely reflects a primordial tilt of the stellar spin axis relative to the protoplanetary disk, rather than dynamical interactions. HIP 41378 f is the first non-eccentric long-period (P>100 days) planet observed with the RM effect, opening new constraints on planetary formation theories. This observation should motivate the exploration of planetary obliquities across a longer range of orbital distances through international collaboration.
title	The star HIP 41378 potentially misaligned with its cohort of long-period planets
topic	Earth and Planetary Astrophysics
url	https://arxiv.org/abs/2507.01807