Band-gap profiling by laser writing of hydrogen-containing III-N-Vs (2012)
Journal Article
Martelli, F., Patanè, A., Rubini, S., Balakrishnan, N., Pettinari, G., Makarovsky, O., …Capizzi, M. (2012). Band-gap profiling by laser writing of hydrogen-containing III-N-Vs. Physical review B: Condensed matter and materials physics, https://doi.org/10.1103/PhysRevB.86.155307

We show that the dissociation of the N-H complex in hydrogenated III-N-Vs can be laser activated at temperatures that are significantly smaller than those (>200?°C) required for thermal dissociation due to a resonant photon absorption by the N-H comp... Read More about Band-gap profiling by laser writing of hydrogen-containing III-N-Vs.

Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics (2012)
Conference Proceeding
Taylor. (2012). Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics. In Proceedings of the workshop "Orbital Couples: Pas de Deux in the Solar System and the Milky Way" (51-58)

Russell (1948) famously described eclipses as the "royal road" to stellar astrophysics. From photometric and spectroscopic observations it is possible to measure the masses and radii (to 1% or better!), and thus surface gravities and mean densities,... Read More about Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics.

Homogeneous studies of transiting planets (2011)
Conference Proceeding
Southworth, J. (2011). Homogeneous studies of transiting planets. . https://doi.org/10.1017/S1743921311027177

The derived physical properties of the known transiting extrasolar planetary systems come from a variety of sources, and are calculated using a range of different methods so are not always directly comparable. I present a catalogue of the physical pr... Read More about Homogeneous studies of transiting planets.

Laser writing of the electronic activity of N- and H-atoms in GaAs (2011)
Journal Article
Martelli, F., Rubini, S., Balakrishnan, N., Patanè, A., Makarovsky, O., Polimeni, A., & Capizzi, M. (2011). Laser writing of the electronic activity of N- and H-atoms in GaAs. Applied Physics Letters, 021105 - 021105. https://doi.org/10.1063/1.3610464

We use a focussed laser beam to control the electronic activity of N- and H-atoms in a dilute nitride Ga(AsN)/GaAs quantum well. Our approach yields submicron resolution in the spatial manipulation of the electronic properties and can provide an alte... Read More about Laser writing of the electronic activity of N- and H-atoms in GaAs.

Theoretical Study of Carbon Clusters in Silicon Carbide Nanowires (2011)
Journal Article
(2011). Theoretical Study of Carbon Clusters in Silicon Carbide Nanowires. Journal of Nanotechnology, 1 - 8. https://doi.org/10.1155/2011/203423

Using first-principles methods we performed a theoretical study of carbon clusters in silicon carbide (SiC) nanowires. We examined small clusters with carbon interstitials and antisites in hydrogen-passivated SiC nanowires growth along the [100] and... Read More about Theoretical Study of Carbon Clusters in Silicon Carbide Nanowires.

Boron and nitrogen impurities in SiC nanoribbons: anab initioinvestigation (2011)
Journal Article
Abreu Da Silva Morbec. (2011). Boron and nitrogen impurities in SiC nanoribbons: anab initioinvestigation. Journal of Physics: Condensed Matter, 205504 - 205504. https://doi.org/10.1088/0953-8984/23/20/205504

Using ab initio calculations based on density-functional theory we have performed a theoretical investigation of substitutional boron and nitrogen impurities in silicon carbide (SiC) nanoribbons. We have considered hydrogen terminated SiC ribbons wit... Read More about Boron and nitrogen impurities in SiC nanoribbons: anab initioinvestigation.

Exact and approximate relations for the spin-dependence of the exchange energy in high magnetic fields (2009)
Journal Article
(2009). Exact and approximate relations for the spin-dependence of the exchange energy in high magnetic fields. International Journal of Modern Physics B, 3004 - 3008. https://doi.org/10.1142/S0217979209062712

The exchange energy of an arbitrary collinear-spin many-body system in an external magnetic field is a functional of the spin-resolved charge and current densities. Within the framework of density-functional theory (DFT), we show that the dependence... Read More about Exact and approximate relations for the spin-dependence of the exchange energy in high magnetic fields.

Massive Stars as Cosmic Engines through the Ages (2008)
Journal Article
Hirschi, R. (2008). Massive Stars as Cosmic Engines through the Ages. Proceedings of the International Astronomical Union, 3-16. https://doi.org/10.1017/S1743921308020292

Some useful developments in the model physics are briefly presented, followed by model results on chemical enrichments and WR stars. We discuss the expected rotation velocities of WR stars. We emphasize that the (C+O)/He ratio is a better chemical in... Read More about Massive Stars as Cosmic Engines through the Ages.

Contribution of the second Landau level to the exchange energy of the three-dimensional electron gas in a high magnetic field (2008)
Journal Article
(2008). Contribution of the second Landau level to the exchange energy of the three-dimensional electron gas in a high magnetic field. Physical review B: Condensed matter and materials physics, https://doi.org/10.1103/PhysRevB.78.085107

We derive a closed analytical expression for the exchange energy of the three-dimensional interacting electron gas in strong magnetic fields, which goes beyond the quantum limit (L=0) by explicitly including the effect of the second, L=1, Landau lev... Read More about Contribution of the second Landau level to the exchange energy of the three-dimensional electron gas in a high magnetic field.

Difficulties in Probing Nuclear Physics: A Study of Ti and Ni (2008)
Presentation / Conference
Hungerford, A., Fryer, C. L., Timmes, F. X., Young, P., Bennett, M., Diehl, S., …Rockefeller, G. (2008, July). Difficulties in Probing Nuclear Physics: A Study of Ti and Ni. Paper presented at 10th Symposium on Nuclei in the Cosmos, Mackinac Island, Michigan, USA

The nucleosynthetic yield from a supernova explosion depends upon a variety of effects: progenitor evolution, explosion process, details of the nuclear network, and nuclear rates. Especially in studies of integrated stellar yields, simplifications re... Read More about Difficulties in Probing Nuclear Physics: A Study of Ti and Ni.

44Ti and 56Ni in core-collapse supernovae (2008)
Presentation / Conference
Magkotsios, G., Timmes, F. X., Wiescher, M., Fryer, C. L., Hungerford, A., Young, P., …Rockefeller, G. (2008, July). 44Ti and 56Ni in core-collapse supernovae. Paper presented at 10th Symposium on Nuclei in the Cosmos, Mackinac Island, Michigan, USA

We investigate the physical conditions where 44Ti and 56Ni are created in core-collapse supernovae. In this preliminary work we use a series of post-processing network calculations with parametrized expansion profiles that are representative of the w... Read More about 44Ti and 56Ni in core-collapse supernovae.

Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models (2008)
Presentation / Conference
(2008, July). Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models. Presented at 10th Symposium on Nuclei in the Cosmos, Mackinac Island, Michigan, USA

We examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D explosion models and spatial distribution of elements in 3D models with... Read More about Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models.

Developments in physics of massive stars (2007)
Conference Proceeding
Meynet, G., Ekström, S., Maeder, A., Hirschi, R., Georgy, C., & Beffa, C. (2007). Developments in physics of massive stars. . https://doi.org/10.1017/S1743921308020449

New constraints on stellar models are provided by large surveys of massive stars, interferometric observations and asteroseismology. After a review of the main results so far obtained, we present new results from rotating models and discuss compariso... Read More about Developments in physics of massive stars.

The ultra-compact binary candidate KUV 23182+1007 is a bright quasar (2007)
Journal Article
Southworth, J., Schwope, A., Gaensicke, B., & Schreiber, M. (2007). The ultra-compact binary candidate KUV 23182+1007 is a bright quasar. arXiv,

KUV 23182+1007 was identified as a blue object in the Kiso UV Survey in the 1980s. Classification-dispersion spectroscopy showed a featureless continuum except for a strong emission line in the region of He II 4686 A. This is a hallmark of the rare A... Read More about The ultra-compact binary candidate KUV 23182+1007 is a bright quasar.

Kinematic structure in the young σ Orionis association (2006)
Journal Article
Jeffries, R., Maxted, P., Oliveira, J., & Naylor, T. (2006). Kinematic structure in the young σ Orionis association. Monthly Notices of the Royal Astronomical Society, 371(1), L6 - L10. https://doi.org/10.1111/j.1745-3933.2006.00196.x

We have used precise radial velocity measurements for a large number of candidate low-mass stars and brown dwarfs, to show that the young Sigma Ori ``cluster'' consists of two spatially superimposed components which are kinematically separated by 7 k... Read More about Kinematic structure in the young σ Orionis association.

Eclipsing Binaries in Open Clusters (2006)
Journal Article
Southworth, J., & Viggo Clausen, J. (2006). Eclipsing Binaries in Open Clusters. Astrophysics and Space Science, 304, Article 199–202. https://doi.org/10.1007/s10509-006-9110-3

Detached eclipsing binaries are very useful objects for calibrating theoretical stellar models and checking their predictions. Detached eclipsing binaries in open clusters are particularly important because of the additional constraints on their age... Read More about Eclipsing Binaries in Open Clusters.

Circumstellar discs in the young σ Orionis cluster (2006)
Journal Article
Oliveira, J., Jeffries, R., Van Loon, J., & Rushton, M. (2006). Circumstellar discs in the young σ Orionis cluster. Monthly Notices of the Royal Astronomical Society, 369(1), 272 -280. https://doi.org/10.1111/j.1365-2966.2006.10299.x

We present new K- and L'-band imaging observations for members of the young (3-5 Myr) sigma Orionis cluster, obtained with UIST at UKIRT. We determine (K-L') colour excesses with respect to the photospheres, finding evidence for warm circumstellar du... Read More about Circumstellar discs in the young σ Orionis cluster.

Synthesis of the Beryllium 3131A Spectral Region (2005)
Journal Article
Ashwell, J., F. Ashwell, J., Jeffries, R., D. Jeffries, R., & Smalley, B. Synthesis of the Beryllium 3131A Spectral Region. Manuscript submitted for publication

The Beryllium spectral region of the Sun, Procyon and 4 stars in the open cluster NGC6633 up to Teff = 7500K have been synthesised using ATLAS9 model atmospheres and the MOOG spectral synthesis program. The line list used for these syntheses has bee... Read More about Synthesis of the Beryllium 3131A Spectral Region.

Young stars and their circumstellar disks in the Sigma Orionis cluster (2004)
Conference Proceeding
M. Oliveira, J., D. Jeffries, R., Th. van Loon, J., & J. Kenyon, M. (2004). Young stars and their circumstellar disks in the Sigma Orionis cluster. In Open Issues in Local Star Formation (55–62). https://doi.org/10.1007/1-4020-2600-5_6

The sigma Orionis cluster is a young association evolving under the disruptive influence of its massive O-star namesake. We are analysing this cluster as part of a program to characterise the influence of O-stars on the early stages of stellar evolut... Read More about Young stars and their circumstellar disks in the Sigma Orionis cluster.

No disks around low-mass stars and brown dwarfs in the young sigma Orionis cluster? (2002)
Journal Article
Oliveira, J., Jeffries, R., Kenyon, M., Thompson, S., & Naylor, T. (2002). No disks around low-mass stars and brown dwarfs in the young sigma Orionis cluster?. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361%3A20011778

We report on the analysis of 2MASS near-infrared data of a sample of low-mass stars and brown dwarfs in the sigma Orionis cluster. Youth and cluster membership have been spectroscopically confirmed using the Li I spectral line. We find little evidenc... Read More about No disks around low-mass stars and brown dwarfs in the young sigma Orionis cluster?.