I am a PostDoc working with Boris Gänsicke in the Astronomy and Astrophysics group.
My research focuses on the study of remnant planetary systems around white dwarfs, which are left over from the main sequence lifetime of the white dwarf. These systems can be used to investigate the bulk composition of exo-planetary material as well as answer questions such as what will happen to our Solar System when the Sun runs out of fuel?
Recently I have been investigating a subset of these systems which host a gaseous disc in addition to a dust disc and metal pollution of the white dwarf atmosphere. The gaseous discs are indicators of dynamic activity in the disc and can be used to better understand these complex systems.
The above image is an artist's impression of the gaseous disc around SDSS J1228+1040 (by Mark Garlick). Saturn and it's rings are shown to scale (Image of Saturn from NASA’s Cassini mission.)
I produced the first image (see the left panel of the movie below) of the above disc using a method called Doppler tomography. The emission we see from this disc varies on a time-scale of decades, and can be well modelled as being generated from a fixed intensity pattern in the disc that is undergoing apsidal precession. As the disc precesses, we see different 'snapshots' of it in the form of emission profiles in the spectra (an example profile is shown in the right of the video below). In the same way that a CT scan works, we can take all of these snapshots and build an image of the system. The only difference is that the spectra give us velocity snapshots, so the image we make is in velocity space).
Link to CV
(Last updated 2018/10/10)