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The primordial abundance of deuterium: ionization correction (2016)
Journal Article
Cooke, R., & Pettini, M. (2016). The primordial abundance of deuterium: ionization correction. Monthly Notices of the Royal Astronomical Society, 455(2), 1512-1521. https://doi.org/10.1093/mnras/stv2343

We determine the relative ionization of deuterium and hydrogen in low metallicity damped Lyman α (DLA) and sub-DLA systems using a detailed suite of photoionization simulations. We model metal-poor DLAs as clouds of gas in pressure equilibrium with a... Read More about The primordial abundance of deuterium: ionization correction.

The Primordial Deuterium Abundance of the Most Metal-poor Damped Lyman-alpha System (2016)
Journal Article
Cooke, R., Pettini, M., Nollett, K., & Jorgenson, R. (2016). The Primordial Deuterium Abundance of the Most Metal-poor Damped Lyman-alpha System. Astrophysical Journal, 830(2), Article 148. https://doi.org/10.3847/0004-637x/830/2/148

We report the discovery and analysis of the most metal-poor damped Lyman-alpha (DLA) system currently known, which also displays the Lyman series absorption lines of neutral deuterium. The average [O/H] abundance of this system is [O/H] = -2.804 +/-... Read More about The Primordial Deuterium Abundance of the Most Metal-poor Damped Lyman-alpha System.

Discovery of a Damped Ly-alpha Absorber at z = 3.3 along a Galaxy Sight-line in the SSA22 Field (2016)
Journal Article
Mawatari, K., Inoue, A., Kousai, K., Hayashino, T., Cooke, R., Prochaska, J., …Matsuda, Y. (2016). Discovery of a Damped Ly-alpha Absorber at z = 3.3 along a Galaxy Sight-line in the SSA22 Field. Astrophysical Journal, 817(2), Article 161. https://doi.org/10.3847/0004-637x/817/2/161

Using galaxies as background light sources to map the Lya absorption lines is a novel approach to study Damped Lya Absorbers (DLAs). We report the discovery of an intervening z = 3.335 +- 0.007 DLA along a galaxy sight-line identified among 80 Lyman... Read More about Discovery of a Damped Ly-alpha Absorber at z = 3.3 along a Galaxy Sight-line in the SSA22 Field.