Waves in Thin Oceans on Oblate Neutron Stars [arxiv link]
In this paper, we investigate the effects of stellar oblateness induced by rapid rotation on modes in the ocean of a neutron star. The calculation involved solving for linear perturbations of shallow water equations and investigating two models prescribing how gravitational acceleration varies across the surface of the star. The frequency of the modes is reduces by up to 40% for the most oblate systems by including this effect.
Relativistic ocean r-modes during type-I X-ray bursts [arxiv link]
In this paper, we investigate the effects of gravitational redshift and frame-dragging on modes in the ocean of a neutron star during a type I X-ray burst. The calculation involves several models for the cooling of the ocean in the aftermath of the burst. The frequency of the modes is reduces by up to 30% by including these effects.
Burning in the tail: implications for a burst oscillation model [arxiv link]
In this paper, we calculate modes during short waiting time bursts, these are hydrogen/helium triggered bursts in quick succession. The calculation involves an accurate background model that includes a realistic composition and full nuclear reaction network. We find that using this background reduces frequency drift compared to previous calculations, which didn't account for composition changes, and was a problem for matching the mode model of burst oscillations to observations.
Superburst Oscillations: ocean and crustal modes excited by Carbon-triggered Type I X-ray bursts [arxiv link]
In this paper, we calculate modes during superbursts which are triggered by unstable carbon burning in the deep ocean and last hours. We find that frequency of the mode (in the rotating frame) varies during the burst from 4–14 Hz and is sensitive to the background parameters, in particular the temperature of the ocean and ignition depth.
Deep model simulation of polar vortices in gas giant atmospheres [arxiv link]
Polar travelling waves in thin rotating spherical shells [arxiv link]
Thermal convection in rotating spherical shells: temperature-dependent internal heat generation using the example of triple-alpha burning [arxiv link]
The onset of low Prandtl number thermal convection in thin spherical shells [arxiv link]
Relativistic r-modes during during type-I X-ray bursts, Texas Symposium, Portsmouth, UK, December 2019
Relativistic r-modes during during type-I X-ray bursts, PHAROS, Barcelona, Spain, April 2019
(Invited) Neutron star crustal modes during type-I X-ray bursts, ICONS, Amsterdam, NL, March 2019
New Burning Physics and Burst Oscillations, COSPAR, Pasedena, USA, June 2018
New Burning Physics and Burst Oscillations, BERN18, Prato, Italy, June 2018
Superburst Oscillations, JINA-CEE: Frontier in Nuclear Astrophysics, Notre Dame, USA, May 2018
Superburst Oscillations, IAU: 50 Years of Pulsars, Manchester, UK, September 2017
Superburst Oscillations, High-throughput X-ray astronomy in the eXTP era, Rome, Italy, February 2017