Oxygen isotopes beyond the proton drip line*

Nuclei at and beyond the drip lines are among the most exotic nuclear species. Beyond the proton drip line, two-proton decay, the most recently discovered nuclear decay channel, occurs. For 2$p$-decaying states in light isotopes, the lifetimes are short and the invariant-mass method is ideal for measuring the decay energy, width, and momentum correlations between the decay fragments. I will present an invariant-mass measurement of the 2$p$-decaying nucleus $^{11}$O, the mirror of $^{11}$Li. I will also present a new measurement of the 2$p$-decaying ground and excited states in $^{12}$O, including a newly observed 2$^{+}$ state. An ambiguity having to do with the possible two-proton decay of this 2$^{+}$ state to the 3.353 MeV excited state in $^{10}$C will also be discussed.