Eccentric debris disc morphologies II: Surface brightness variations from overlapping orbits in narrow eccentric discs

Abstract We present Paper II of the Eccentric Debris Disc Morphologies series to explore effects that significant free and forced eccentricities have on high-resolution millimetre-wavelength observations debris discs, motivated by recent ALMA images HD53143’s disc. In this work, we eccentricity, varying disc fractional widths observational resolutions, show for a range narrow eccentric orbital overlaps result in dust emission distributions either one or two radial peaks at apocentre and/or pericentre. The narrowest discs contain peaks, whereas broadest just peak. For fixed eccentricities, as are increased, these merge first (producing glow), then pericentre glow). Our work thus demonstrates apocentre/pericentre glows models with constant can be both width resolution dependent millimetre wavelengths, challenging classical assertion purely wavelength dependent. discuss future distinguish between competing interpretations underlying eccentricity distributions.