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Spectroscopic monitoring of V Hydrae: a binary eclipsed by a jet?

Published online by Cambridge University Press:  06 October 2025

Léa Planquart Open the ORCID record for Léa Planquart [Opens in a new window]  and
Alain Jorissen
Léa Planquart*
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, 1050 Brussels, Belgium.
Alain Jorissen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, 1050 Brussels, Belgium.
*
email: lea.planquart@ulb.be
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Abstract

The carbon-rich star V Hydrae is known to be in its transition from the asymptotic giant branch phase to a bipolar planetary nebula. However, the origin of its bipolar shape, as well as its long-term periodic obscuration, are not well understood. Using high-resolution spectra from the HERMES/Mercator spectrograph spanning over 10-yr monitoring, we disentangled the orbital signal from the intrinsic Mira-like variations of V Hya. The orbital solution obtained is compatible with the light-curve modulation, which we interpret as an obscuration caused by an extended dusty environment surrounding the unseen companion. Additionally, we report high-velocity phase-dependent absorption features in the sodium doublet and explain them by the presence of a conical jet ejected from the (accretion disc of the) companion. We confront our binary scenario with previous radio observations and discuss how this jet could shape the large-scale bipolar outflow of the system.

Keywords

stars: AGB and post-AGBstars: binariesAGB starISM: jets and outflows

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S384: Planetary Nebulae: A Universal Toolbox in the Era of Precision Astrophysics , December 2023 , pp. 366 - 369
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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