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"Dobson, Ross"
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King of the grill
From the master of the barbecue tongs comes a bumper collection of approximately 200 of Ross Dobson's favourite recipes for the grill and hotplate. This comprehensive compilation draws together the best of Ross's no-nonsense barbecuing guides Fired Up, More Fired Up and Fired Up Vegetarian as well as selections from Grillhouse. It presents a versatile array of flavoursome and exciting recipes, ranging from a casual but perfectly cooked steak to a weekend feast for friends. In addition to much-loved traditional Australian classics there are dishes drawing on influences from around the globe South East Asia, India, the Middle East, Europe and the Americas. King of the Grill caters to meatlovers and vegetarians alike, and also features recipes for breads, dips, salads and other extras to accompany your barbecue. An introductory section provides invaluable advice on types of barbecue, temperatures and cooking times, techniques and utensils. Written with wit as well as expertise, this is an entertaining must-have book that covers all your barbecuing needs.
Book
Early Spectroscopy and Dense Circumstellar Medium Interaction in SN 2023ixf
We present the optical spectroscopic evolution of SN~2023ixf seen in sub-night cadence spectra from 1.18 to 14 days after explosion. We identify high-ionization emission features, signatures of interaction with material surrounding the progenitor star, that fade over the first 7 days, with rapid evolution between spectra observed within the same night. We compare the emission lines present and their relative strength to those of other supernovae with early interaction, finding a close match to SN~2020pni and SN~2017ahn in the first spectrum and SN~2014G at later epochs. To physically interpret our observations we compare them to CMFGEN models with confined, dense circumstellar material around a red supergiant progenitor from the literature. We find that very few models reproduce the blended \\NC{} emission lines observed in the first few spectra and their rapid disappearance thereafter, making this a unique diagnostic. From the best models, we find a mass-loss rate of \\(10^{-3}-10^{-2}\\) \\mlunit{}, which far exceeds the mass-loss rate for any steady wind, especially for a red supergiant in the initial mass range of the detected progenitor. These mass-loss rates are, however, similar to rates inferred for other supernovae with early circumstellar interaction. Using the phase when the narrow emission features disappear, we calculate an outer dense radius of circumstellar material \\(R_\\mathrm{CSM, out}\\sim5\\times10^{14}~\\mathrm{cm}\\) and a mean circumstellar material density of \\(\\rho=5.6\\times10^{-14}~\\mathrm{g\\,cm^{-3}}\\). This is consistent with the lower limit on the outer radius of the circumstellar material we calculate from the peak \\Halpha{} emission flux, \\(R_\\text{CSM, out}\\gtrsim9\\times10^{13}~\\mathrm{cm}\\).
Paper
The DBL Survey II: towards a mass-period distribution of double white dwarf binaries
Double white dwarf binaries are an important remnant of binary evolution as they are possible type Ia supernova progenitors and strong sources of gravitational waves in the low-frequency regime. The double-lined double white dwarf (DBL) survey searches for compact double white dwarfs where both stars are spectrally disentangleable. Candidates are identified by being overluminous compared to the cooling sequence of a typical mass, single white dwarf. In this second DBL survey instalment, we present full orbital solutions of 15 double white dwarf binaries from our ongoing campaign to accurately measure a magnitude-limited mass-period distribution. 12 of these systems are fully solved for the first time. A long-standing bias in the full population has been evident, favouring systems with orbital periods up to a few hours, with little exploration of the majority of the compact double white dwarf population, whose orbital period distribution centres at approximately 20hr. The 15 systems in this study span the orbital period range 5-75hr, significantly augmenting the number of well-characterised systems over these periods, and in general have two similar mass stars combining to approximately 1.0 solar masses. We witness that the orbitally derived mass ratios generally show an excellent agreement with those deduced from atmospheric fits to double-lined spectra in previous work, emphasising the power of wide-scale spectroscopic surveys to efficiently locate the highest mass, double-lined double white dwarfs in the local Galaxy.
Paper