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Journal Articles Nature Astronomy Year : 2022

A likely flyby of binary protostar Z CMa caught in action

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1
Ruobing Dong
  • Function : Author
Hauyu Baobab Liu
  • Function : Author
Christophe Pinte
  • Function : Author
Péter Ábrahám
  • Function : Author
Eduard Vorobyov
  • Function : Author
Jun Hashimoto
  • Function : Author
Ágnes Kóspál
  • Function : Author
Eugene Chiang
  • Function : Author
Michihiro Takami
  • Function : Author
Lei Chen
  • Function : Author
Michael Dunham
  • Function : Author
Misato Fukagawa
  • Function : Author
Joel Green
  • Function : Author
Yasuhiro Hasegawa
  • Function : Author
Thomas Henning
  • Function : Author
Yaroslav Pavlyuchenkov
  • Function : Author
Tae-Soo Pyo
  • Function : Author
Motohide Tamura
  • Function : Author

Abstract

Close encounters between young stellar objects in star-forming clusters are expected to markedly perturb circumstellar disks. Such events are witnessed in numerical simulations of star formation1-3, but few direct observations of ongoing encounters have been made. Here we report sub-0.1″-resolution Atacama Large Millimeter/Submillimeter Array and Jansky Very Large Array observations towards the million-year-old binary protostar Z Canis Majoris in dust continuum and molecular line emission. A point source ~4,700 au from the binary has been discovered at both millimetre and centimetre wavelengths. It is located along the extension of a ~2,000 au streamer structure previously found in scattered light imaging, whose counterpart in dust and gas emission is also newly identified. Comparison with simulations shows signposts of a rare flyby event in action. Z CMa is a `double burster', as both binary components undergo accretion outbursts4, which may be facilitated by perturbations to the host disk by flybys5-8.

Dates and versions

insu-03705388 , version 1 (27-06-2022)

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Ruobing Dong, Hauyu Baobab Liu, Nicolás Cuello, Christophe Pinte, Péter Ábrahám, et al.. A likely flyby of binary protostar Z CMa caught in action. Nature Astronomy, 2022, 6, pp.331-338. ⟨10.1038/s41550-021-01558-y⟩. ⟨insu-03705388⟩
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