Skip to main content

Research Repository

See what's under the surface


The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints (2019)
Journal Article
den Hartogh, J., Hirschi, R., Lugaro, M., Doherty, C., Battino, U., Herwig, F., …Eggenberger, P. (2019). The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints. Astronomy and Astrophysics,

Aims. We investigate the s-process during the AGB phase of stellar models whose cores are enforced to rotate at rates consistent with asteroseismology observations of their progenitors and successors. Methods. We calculated new 2M⊙, Z=0.01 models, ro... Read More about The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints.

Galaxy And Mass Assembly (GAMA): Properties and evolution of red spiral galaxies (2019)
Journal Article
Mahajan, S., Kamal Gupta, K., Rana, R., Brown, M. J. I., Phillipps, S., Bland-Hawthorn, J., …Wang, L. (in press). Galaxy And Mass Assembly (GAMA): Properties and evolution of red spiral galaxies. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, https://doi.org/10.1093/mnras/stz2993

We use multi-wavelength data from the Galaxy and Mass Assembly (GAMA) survey to explore the cause of red optical colours in nearby (0.002 < z < 0.06) spiral galaxies. We show that the colours of red spiral galaxies are a direct consequence of some en... Read More about Galaxy And Mass Assembly (GAMA): Properties and evolution of red spiral galaxies.

The Rotational Profiles of Cluster Galaxies (2019)
Journal Article
Bilton, L. E., Hunt, M., Pimbblet, K. A., & Roediger, E. (2019). The Rotational Profiles of Cluster Galaxies. Monthly notices of the Royal Astronomical Society, 490(4), 5017-5032. https://doi.org/10.1093/mnras/stz2927

We compile two samples of cluster galaxies with complimentary hydrodynamic and N-body analysis using FLASH code to ascertain how their differing populations drive their rotational profiles and to better understand their dynamical histories. We select... Read More about The Rotational Profiles of Cluster Galaxies.

The Rotational Profiles of Cluster Galaxies (2019)
Journal Article
Bilton, L. E., Hunt, M., Pimbblet, K. A., & Roediger, E. (2019). The Rotational Profiles of Cluster Galaxies. Monthly notices of the Royal Astronomical Society, 490(4), 5017-5032. https://doi.org/10.1093/mnras/stz2927

We compile two samples of cluster galaxies with complimentary hydrodynamic and N-body analysis using FLASH code to ascertain how their differing populations drive their rotational profiles and to better understand their dynamical histories. We select... Read More about The Rotational Profiles of Cluster Galaxies.

Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 Surveys (2019)
Journal Article
Birko, D., Zwitter, T., Grebel, E. K., Parker, Q. A., Kordopatis, G., Bland-Hawthorn, J., …Watson, F. (in press). Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 Surveys. The Astronomical journal, 158(4), https://doi.org/10.3847/1538-3881/ab3cc1

The combination of the final version of the Radial Velocity Experiment (RAVE) spectroscopic survey data release 6 with radial velocities (RVs) and astrometry from Gaia DR2 allows us to identify and create a catalog of single-lined binary star candida... Read More about Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 Surveys.

Heterogeneity of inverted calcium II H:K ratio cluster galaxies (2019)
Journal Article
Pimbblet, K. A., Crossett, J. P., & Fraser-McKelvie, A. (2019). Heterogeneity of inverted calcium II H:K ratio cluster galaxies. Monthly notices of the Royal Astronomical Society, 490(1), 455-466. https://doi.org/10.1093/mnras/stz2549

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society The ratio of calcium II H plus H∊ to calcium II K inverts as a galaxy stellar population moves from being dominated by older stars to possessing mor... Read More about Heterogeneity of inverted calcium II H:K ratio cluster galaxies.

Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process (2019)
Journal Article
Battino, U., Travaglio, C., Pignatari, M., & Lederer-Woods, C. (in press). Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process. Springer Proceedings in Physics, 219, 179-182. https://doi.org/10.1007/978-3-030-13876-9_29

© 2019, Springer Nature Switzerland AG. The production of the proton-rich isotopes beyond iron that we observe today in the solar system is still uncertain. Thermonuclear supernovae (SNe Ia) exploding within the single-degenerate scenario have been p... Read More about Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process.

Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo (2019)
Journal Article
Wehmeyer, B., Fröhlich, C., Pignatari, M., & Thielemann, F. K. (in press). Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo. Springer Proceedings in Physics, 219, 91-96. https://doi.org/10.1007/978-3-030-13876-9_15

© 2019, Springer Nature Switzerland AG. The origin of the heaviest elements is still a matter of debate. For the rapid neutron capture process (“r-process”), multiple sites have been proposed, e.g., neutron star mergers and (sub-classes) of supernova... Read More about Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo.

H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars (2019)
Journal Article
Clarkson, O., Herwig, F., Andrassy, R., Woodward, P., Pignatari, M., & Mao, H. (in press). H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars. Springer Proceedings in Physics, 219, 321-325. https://doi.org/10.1007/978-3-030-13876-9_56

© 2019, Springer Nature Switzerland AG. We report on our ongoing investigation into the nucleosynthetic and hydrodynamic nature of mixing at the interface between the H- and He-convection zones in massive Pop III stars. Studying recent a grid of 26 1... Read More about H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars.

The chromospheric response to the sunquake generated by the X9.3 flare of NOAA 12673 (2019)
Journal Article
Quinn, S., Reid, A., Mathioudakis, M., Nelson, C., Prasad, S. K., & Zharkov, S. (2019). The chromospheric response to the sunquake generated by the X9.3 flare of NOAA 12673. The Astrophysical journal, 881(1), https://doi.org/10.3847/1538-4357/ab2c9e

Active region NOAA 12673 was extremely volatile in 2017 September, producing many solar flares, including the largest of solar cycle 24, an X9.3 flare of 06 September 2017. It has been reported that this flare produced a number of sunquakes along the... Read More about The chromospheric response to the sunquake generated by the X9.3 flare of NOAA 12673.

Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys (2019)
Journal Article
Sweet, S. M., Richards, S. N., Owers, M. S., Medling, A. M., Lorente, N. P., Lawrence, J. S., …Van De Sande, J. (2019). Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys. Monthly notices of the Royal Astronomical Society, 489(2), 2830–2843. https://doi.org/10.1093/mnras/stz2237

The Galaxy And Mass Assembly (GAMA) survey has morphologically identified a class of ‘Little Blue Spheroid’ (LBS) galaxies whose relationship to other classes of galaxies we now examine in detail. Considering a sample of 868 LBSs, we find that such g... Read More about Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys.

ASKAP commissioning observations of the GAMA 23 field (2019)
Journal Article
Leahy, D. A., Hopkins, A. M., Norris, R. P., Marvil, J., Collier, J. D., Taylor, E. N., …Wang, L. (2019). ASKAP commissioning observations of the GAMA 23 field. Publications / Astronomical Society of Australia, 36, https://doi.org/10.1017/pasa.2019.16

© Astronomical Society of Australia 2019. We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telesco... Read More about ASKAP commissioning observations of the GAMA 23 field.

The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations (2019)
Journal Article
Denissenkov, P. A., Herwig, F., Woodward, P., Andrassy, R., Pignatari, M., & Jones, S. (2019). The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 488(3), 4258-4270. https://doi.org/10.1093/mnras/stz1921

Galactic chemical evolution of radioactive isotopes (2019)
Journal Article
Côté, B., Lugaro, M., Reifarth, R., Pignatari, M., Világos, B., Yagüe, A., & Gibson, B. K. (2019). Galactic chemical evolution of radioactive isotopes. The Astrophysical journal, 878(2), https://doi.org/10.3847/1538-4357/ab21d1

The presence of short-lived (∼ Myr) radioactive isotopes in meteoritic inclusions at the time of their formation represents a unique opportunity to study the circumstances that led to the formation of the Solar System. To interpret these observations... Read More about Galactic chemical evolution of radioactive isotopes.

The effect of minor and major mergers on the evolution of low excitation radio galaxies (2019)
Journal Article
Gordon, Y. A., Pimbblet, K. A., Kaviraj, S., Owers, M. S., O'Dea, C. P., Walmsley, M., …Pierce, J. C. (2019). The effect of minor and major mergers on the evolution of low excitation radio galaxies. The Astrophysical journal, 878(2), https://doi.org/10.3847/1538-4357/ab203f

We use deep, μ r lesssim 28 mag arcsec−2, r-band imaging from the Dark Energy Camera Legacy Survey to search for past, or ongoing, merger activity in a sample of 282 low-excitation radio galaxies (LERGs) at z < 0.07. Our principal aim is to assess t... Read More about The effect of minor and major mergers on the evolution of low excitation radio galaxies.

Using failed supernovae to constrain the Galactic r-process element production (2019)
Journal Article
Wehmeyer, B., Wehmeyer, B., Fröhlich, C., Fröhlich, C., Côté, B., Côté, B., …Thielemann, F. K. (2019). Using failed supernovae to constrain the Galactic r-process element production. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 487(2), 1745-1753. https://doi.org/10.1093/mnras/stz1310

Rapid neutron capture process (r-process) elements have been detected in a large fraction of metal-poor halo stars, with abundances relative to iron (Fe) that vary by over two orders of magnitude. This scatter is reduced to less than a factor of 3 in... Read More about Using failed supernovae to constrain the Galactic r-process element production.

Neutron star mergers might not be the only source of r-process elements in the Milky Way (2019)
Journal Article
Côté, B., Eichler, M., Arcones, A., Hansen, C. J., Simonetti, P., Frebel, A., …Matteucci, F. (2019). Neutron star mergers might not be the only source of r-process elements in the Milky Way. The Astrophysical journal, 875(2), 106. https://doi.org/10.3847/1538-4357/ab10db

Probing the origin of r-process elements in the universe represents a multidisciplinary challenge. We review the observational evidence that probes the properties of r-process sites, and address them using galactic chemical evolution simulations, bin... Read More about Neutron star mergers might not be the only source of r-process elements in the Milky Way.

H2, HD, and D2 in the small cage of structure II clathrate hydrate: vibrational frequency shifts from fully coupled quantum six-dimensional calculations of the vibration-translation-rotation eigenstates (2019)
Journal Article
Lauvergnat, D., Felker, P., Scribano, Y., Benoit, D. M., & Bačić, Z. (2019). H2, HD, and D2 in the small cage of structure II clathrate hydrate: vibrational frequency shifts from fully coupled quantum six-dimensional calculations of the vibration-translation-rotation eigenstates. The Journal of chemical physics, 150(15), https://doi.org/10.1063/1.5090573

We report the first fully coupled quantum six-dimensional (6D) bound-state calculations of the vibration-translation-rotation eigenstates of a flexible H2, HD, and D2 molecule confined inside the small cage of the structure II clathrate hydrate embed... Read More about H2, HD, and D2 in the small cage of structure II clathrate hydrate: vibrational frequency shifts from fully coupled quantum six-dimensional calculations of the vibration-translation-rotation eigenstates.

The R-Process Alliance: Discovery of a Low-α, r-process-enhanced Metal-poor Star in the Galactic Halo (2019)
Journal Article
Wyse, R. F., Sakari, C. M., Roederer, I. U., Placco, V. M., Beers, T. C., Ezzeddine, R., …Watson, F. (2019). The R-Process Alliance: Discovery of a Low-α, r-process-enhanced Metal-poor Star in the Galactic Halo. The Astrophysical journal, 874(2), https://doi.org/10.3847/1538-4357/ab0c02

A new moderately r-process-enhanced metal-poor star, RAVE J093730.5−062655, has been identified in the Milky Way halo as part of an ongoing survey by the R-Process Alliance. The temperature and surface gravity indicate that J0937−0626 is likely a hor... Read More about The R-Process Alliance: Discovery of a Low-α, r-process-enhanced Metal-poor Star in the Galactic Halo.

A new class of x-ray tails of early-type galaxies and subclusters in galaxy clusters: Slingshot tails versus ram pressure stripped tails (2019)
Journal Article
Sheardown, A., Fish, T. M., Roediger, E., Hunt, M., ZuHone, J., Su, Y., …De Grandi, S. (2019). A new class of x-ray tails of early-type galaxies and subclusters in galaxy clusters: Slingshot tails versus ram pressure stripped tails. The Astrophysical journal, 874(2), 112. https://doi.org/10.3847/1538-4357/ab0c06

We show that there is a new class of gas tails—slingshot tails—that form as a subhalo (i.e., a subcluster or early-type cluster galaxy) moves away from the cluster center toward the apocenter of its orbit. These tails can point perpendicular or even... Read More about A new class of x-ray tails of early-type galaxies and subclusters in galaxy clusters: Slingshot tails versus ram pressure stripped tails.