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The influence of accretion rate and metallicity on thermonuclear bursts: predictions from KEPLER models
Nathanael Lampe, Alexander Heger, Duncan K. Galloway
Using the KEPLER hydrodynamics code, 464 models of thermonuclear X-ray bursters were performed across a range of accretion rates and compositions. We present the library of simulat…
The interplay between chemistry and nucleation in the formation of carbonaceous dust in supernova ejecta
Davide Lazzati, Alexander Heger
Core-collapse supernovae are considered to be important contributors to the primitive dust enrichment of the interstellar medium in the high-redshift universe. Theoretical models o…
Neutrino-Induced Nucleosynthesis in Helium Shells of Early Core-Collapse Supernovae
Projjwal Banerjee, Yong-Zhong Qian, Alexander Heger +1
We summarize our studies on neutrino-driven nucleosynthesis in He shells of early core-collapse supernovae with metallicities of . We find that for prog…
The Mass Distribution of Population III Stars
M. Fraser, A. R. Casey, G. Gilmore +2
Extremely metal-poor stars are uniquely informative on the nature of massive Population III stars. Modulo a few elements that vary with stellar evolution, the present-day photosphe…
Carbon production on accreting neutron stars in a new regime of stable nuclear burning
L. Keek, A. Heger
Accreting neutron stars exhibit Type I X-ray bursts from both frequent hydrogen/helium flashes as well as rare carbon flashes. The latter (superbursts) ignite in the ashes of the f…
Metal-Poor Stars Observed with the Magellan Telescope. III. New Extremely and Ultra Metal-Poor Stars from SDSS/SEGUE and Insights on the Formation of Ultra Metal-Poor Stars
Vinicius M. Placco, Anna Frebel, Young Sun Lee +5
We report the discovery of one extremely metal-poor (EMP; [Fe/H]<-3) and one ultra metal-poor (UMP; [Fe/H]<-4) star selected from the SDSS/SEGUE survey. These stars were identified…
Can direct collapse black holes launch gamma-ray bursts and grow to supermassive black holes?
Tatsuya Matsumoto, Daisuke Nakauchi, Kunihito Ioka +2
The existence of black holes (BHs) of mass ~ 10^{9} M_sun at z > 6 is a big puzzle in astrophysics because even optimistic estimates of the accretion time are insufficient for stel…
The Remarkable Deaths of 9 - 11 Solar Mass Stars
S. E. Woosley, Alexander Heger
The post-helium burning evolution of stars from 7 to 11 solar masses is complicated by the lingering effects of degeneracy and off-center ignition. Here stars in this mass range ar…
Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.31
Michael Bessell, Remo Collett, Stefan Keller +15
SMSS J031300.36-670839.3 (hereafter SM0313-6708) is a sub-giant halo star, with no detectable Fe lines and large overabundances of C and Mg relative to Ca. We obtained VLT-UVES spe…
The GALAH Survey: Scientific Motivation
G. M. De Silva, K. C. Freeman, J. Bland-Hawthorn +44
The GALAH survey is a large high-resolution spectroscopic survey using the newly commissioned HERMES spectrograph on the Anglo-Australian Telescope. The HERMES spectrograph provide…
Are Models for Core-Collapse Supernova Progenitors Consistent with the Properties of Supernova Remnants?
Daniel J. Patnaude, Shiu-Hang Lee, Patrick O. Slane +4
The recent discovery that the Fe-K line luminosities and energy centroids observed in nearby SNRs are a strong discriminant of both progenitor type and circumstellar environment ha…
The LOFT perspective on neutron star thermonuclear bursts
J. J. M. in 't Zand, D. Altamirano, D. R. Ballantyne +31
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT f…