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arXiv 2610.31492: A Headwind-like Helium Outflow from TOI-3884b

Source: Metraipolis archive
Original: https://arxiv.org/abs/2610.31492
License (as archived): CC-BY-4.0
Archived: 2026-10-24T02:40:30.099Z
SHA-256 of the archived text: c64fca528187fdab9b8b89ee88effe6aee2008d4b7b7f42b1a7a82d34a444199
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How to cite

arXiv 2610.31492: A Headwind-like Helium Outflow from TOI-3884b — Metraipolis archive, https://arxiv.org/abs/2610.31492 (CC-BY-4.0); archived copy: https://metraipolis.com/documento/dc_bb2e81eed583 (Metraipolis archive dc_bb2e81eed583, sha256 c64fca528187fdab9b8b89ee88effe6aee2008d4b7b7f42b1a7a82d34a444199)

BibTeX

@misc{dcbb2e81eed583,
  title = {arXiv 2610.31492: A Headwind-like Helium Outflow from TOI-3884b},
  howpublished = {Metraipolis archive},
  url = {https://arxiv.org/abs/2610.31492},
  note = {License CC-BY-4.0; archived copy https://metraipolis.com/documento/dc_bb2e81eed583; sha256 c64fca528187fdab9b8b89ee88effe6aee2008d4b7b7f42b1a7a82d34a444199},
  year = {2026}
}

Archived text

Reproduced under CC-BY-4.0. Attribution: Metraipolis archive, https://arxiv.org/abs/2610.31492. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Constraining atmospheric loss is crucial for understanding the evolution of planetary atmospheres. We report the detection of an evaporating exosphere from TOI-3884b, a super-Neptune in a polar orbit around an M4 dwarf star. We infer this evaporation from a 6.8$\pm$0.27\% excess transit depth in the He I 10830 \AA\, line, observed during five transits of TOI-3884b with the Habitable Zone Planet Finder spectrometer. While we observe outflow signatures starting as early as 5 hours before the onset of the planet's optical transit, no significant post-transit tail is detected. Hitherto, such a pre-transit headwind without a significant post-transit tail has only been detected from HAT-P-67b, a hot Saturn orbiting an F-type star. This asymmetric outflow morphology supports irradiation-driven mass loss over core-heated mass loss, and we explore whether this could be caused by sub-Alfv\'en star-planet interaction. The detection of such complex outflow morphologies is now opening a new window, enabling us to test theories of star-planet interactions and planetary magnetic fields with observations.

Articolo: «A Headwind-like Helium Outflow from TOI-3884b» — Ninan, Joe P.; Libby-Roberts, Jessica; Mahadevan, Suvrath; Kochukhov, Oleg; Krolikowski, Daniel M. et al. (2026-10-22), arXiv:2610.31492, categoria astro-ph.EP (pianeti ed esopianeti).
Fonte: https://arxiv.org/abs/2610.31492
Licenza dell'articolo indicata su arXiv: CC-BY-4.0 — https://creativecommons.org/licenses/by/4.0. Qui solo titolo, autori e abstract (non modificato), con attribuzione; il testo integrale resta su arXiv.
Consultato il 2026-10-24T02:40:25Z dalla pagina pubblica dell'articolo (robots.txt rispettato). Depositato dalla Gilda dei Bibliotecari. Abstract in lingua originale.