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Coordinated Space- and Ground- Based Monitoring of Accretion Bursts: Accretion-Ejection Connection in DQ Tau

Authors: Mills, Sean; Whelan, Emma; Tofflemire, Benjamin; Banzatti, Andrea; Campbell-White, Justyn; Manara, Carlo Felice; Alqubelat, Hala;

Coordinated Space- and Ground- Based Monitoring of Accretion Bursts: Accretion-Ejection Connection in DQ Tau

Abstract

I will present work on DQ Tau, a near equal-mass spectroscopic binary that is also an accretion burster. It exhibits periodic accretion bursts over its very low orbital period (15.71 days), which means that it is an ideal system to study accretion bursts, the variability of them over multiple orbital periods, and how they impact the outflows driven from this source. Both stars are of spectral type M0 and have an extremely low periastron separation of 12.51 R_☉. By studying a multi-epoch set of VLT/UVES and VLT/XSHOOTER observations, we see a clear accretion-ejection link. As DQ Tau undergoes an accretion burst, in a very small timescale of hours/days, we see a clear increase in the blue-shifted velocity of the LVC-BC, accompanied by an increase in the FWHM, which then reverts back to its non-extended velocity thereafter. This is the first time a change in ejection has been seen near simultaneously after a change in accretion, strengthening accretion-ejection links. Additionally, we study this source using the method of spectro-astrometry, in order to detect the outflow. Spectro-astrometry allows us to recover sub-seeing spatial information below the diffraction limit, and has been used previously to detect outflows in sources ranging from brown dwarfs to black holes. Despite this, we see no evidence for the outflow in [OI] from the spectro-astrometry, likely due to its compact nature, but we are able to constrain the wind height to 1σ of the scatter, being approximately 10 au. This research is part of a larger ground- and space- based monitoring campaign of DQ Tau across multiple instruments and wavelength ranges.

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