  A highly important aspect of solar activity is the coupling between eruptions
and the surrounding coronal magnetic-field topology, which determines the
trajectory and morphology of the event and can even lead to sympathetic
eruptions from multiple sources. In this paper, we report on a numerical
simulation of a new type of coupled eruption, in which a coronal jet initiated
by a large pseudostreamer filament eruption triggers a streamer-blowout coronal
mass ejection (CME) from the neighboring helmet streamer. Our configuration has
a large opposite-polarity region positioned between the polar coronal hole and
a small equatorial coronal hole, forming a pseudostreamer flanked by the
coronal holes and the helmet streamer. Further out, the pseudostreamer stalk
takes the shape of an extended arc in the heliosphere. We energize the system
by applying photospheric shear along a section of the polarity inversion line
within the pseudostreamer. The resulting sheared-arcade filament channel
develops a flux rope that eventually erupts as a classic coronal-hole-type jet.
However, the enhanced breakout reconnection above the channel as the jet is
launched progresses into the neighboring helmet streamer, partially launching
the jet along closed helmet streamer field lines and blowing out the streamer
top to produce a classic bubble-like CME. This CME is strongly deflected from
the jet's initial trajectory and contains a mixture of open and closed magnetic
field lines. We present the detailed dynamics of this new type of coupled
eruption, its underlying mechanisms and the implications of this work for the
interpretation of in-situ and remote-sensing observations.
