Formation of EPIC 212036875 b by gravitational instability in a protoplanetary disc. The contour plot shows the minimum mass of a fragment arising from disc instability as a function of the disc’s viscosity and accretion rate. The red line indicates masses equal to the observed mass of EPIC 212036875 b. The horizontal black line shows the minimum α that a gravitationally unstable disc will generate, while the vertical black lines show the median and maximum accretion rates for FUOR discs found by Gramajo et al. (2014). Discs in the white region to the left are gravitationally stable, and hence do not form any fragments.