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Monthly Notices of the Royal Astronomical Society, volume 504, issue 1, pages 871-877

Modulated accretion in the T Tauri star RY Tau – a stable MHD propeller or a planet at 0.2 au?

Petrov Alexander P Ch ¹

Romanova M. M. ²

Grankin K. N. ¹

Artemenko S. A. ¹

Babina E. V. ¹

Gorda S. Yu. ³

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Crimean Astrophysical Observatory, p/o Nauchny, 298409, Republic of Crimea |

Cornell University, Ithaca, NY 14853, USA |

Ural Federal University, 51 Lenin av., Ekaterinburg, 620000, Russia |

Publication type: Journal Article

Publication date: 2021-04-21

Oxford University Press

Journal: Monthly Notices of the Royal Astronomical Society

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Impact factor: 4.8

ISSN: 00358711, 13652966

DOI: 10.1093/mnras/stab904

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Space and Planetary Science

Astronomy and Astrophysics

Abstract

ABSTRACT

Planets are thought to form at the early stage of stellar evolution when mass accretion is still ongoing. RY Tau is a T Tauri type star at the age of a few Myr, with an accretion disc seen at high inclination, so that the line of sight crosses both the wind and accretion gas flows. In a long series of spectroscopic monitoring of the star over the period 2013–2020, we detected variations in H$\, {\alpha }$ and Na i D absorptions at radial velocities of infall (accretion) and outflow (wind) with a period of about 22 d. The absorptions in the infalling and outflowing gas streams vary in antiphase: an increase of infall is accompanied by a decrease of outflow, and vice versa. These ‘flip-flop’ oscillations retain phase over several years of observations. We suggest that this may result from the magnetohydrodynamics processes at the disc–magnetosphere boundary in the propeller mode. Another possibility is that a massive planet is modulating some processes in the disc and is providing the observed effects. The period, if Keplerian, corresponds to a distance of 0.2 au, which is close to the dust sublimation radius in this star. The presence of the putative planet can be confirmed by radial velocity measurements: the expected amplitude is ≥90 m s−1 if the planet mass is ≥2 MJ.

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Astronomical Journal	Astronomical Journal, 2, 40% Astronomical Journal 2 publications, 40%
Astronomy and Astrophysics	Astronomy and Astrophysics, 1, 20% Astronomy and Astrophysics 1 publication, 20%
Astrophysical Journal, Supplement Series	Astrophysical Journal, Supplement Series, 1, 20% Astrophysical Journal, Supplement Series 1 publication, 20%
Monthly Notices of the Royal Astronomical Society	Monthly Notices of the Royal Astronomical Society, 1, 20% Monthly Notices of the Royal Astronomical Society 1 publication, 20%
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IOP Publishing	IOP Publishing, 2, 40% IOP Publishing 2 publications, 40%
EDP Sciences	EDP Sciences, 1, 20% EDP Sciences 1 publication, 20%
American Astronomical Society	American Astronomical Society, 1, 20% American Astronomical Society 1 publication, 20%
Oxford University Press	Oxford University Press, 1, 20% Oxford University Press 1 publication, 20%
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Petrov A. P. C. et al. Modulated accretion in the T Tauri star RY Tau – a stable MHD propeller or a planet at 0.2 au? // Monthly Notices of the Royal Astronomical Society. 2021. Vol. 504. No. 1. pp. 871-877.

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Petrov A. P. C., Romanova M. M., Grankin K. N., Artemenko S. A., Babina E. V., Gorda S. Y. Modulated accretion in the T Tauri star RY Tau – a stable MHD propeller or a planet at 0.2 au? // Monthly Notices of the Royal Astronomical Society. 2021. Vol. 504. No. 1. pp. 871-877.

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