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"McCully, C."
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Low-redshift Type Ia Supernova from the LSQ/LCO Collaboration
This paper is the data release of a new sample of 140 type Ia supernovae (SNe Ia) from the LaSilla-QUEST/Las Cumbres Observatory (LCO) collaboration. The discovery of the supernovae came from the LaSilla-QUEST variability survey, the ASASSN survey, as well as smaller low redshift supernova surveys. All of the supernovae in this sample were spectroscopically identified as SNe Ia using spectra from the PESSTO survey using the 3.5 m NTT telescope at LaSilla and spectra from the LCO 2 m Faulkes telescopes. The light-curves were obtained from a rapid cadence photometric follow up of the supernovae with the 9 LCO 1 m telescopes located at various observatories around the globe. Reference images of the host galaxies were taken approximately a year after the supernova have faded to allow precise galaxy background subtraction from the supernova magnitudes. The supernovae in this sample were discovered over a seven year period from 2012 October to 2019 June, and the last galaxy reference images were taken before 2020 June.
Journal Article
Two peculiar fast transients in a strongly lensed host galaxy
A massive galaxy cluster can serve as a magnifying glass for distant stellar populations, as strong gravitational lensing magnifies background galaxies and exposes details that are otherwise undetectable. In time-domain astronomy, imaging programmes with a short cadence are able to detect rapidly evolving transients, previously unseen by surveys designed for slowly evolving supernovae. Here, we describe two unusual transient events discovered in a Hubble Space Telescope programme that combined these techniques with high-cadence imaging on a field with a strong-lensing galaxy cluster. These transients were faster and fainter than any supernovae, but substantially more luminous than a classical nova. We find that they can be explained as separate eruptions of a luminous blue variable star or a recurrent nova, or as an unrelated pair of stellar microlensing events. To distinguish between these hypotheses will require clarification of the cluster lens models, along with more high-cadence imaging of the field that could detect related transient episodes. This discovery suggests that the intersection of strong lensing with high-cadence transient surveys may be a fruitful path for future astrophysical transient studies.
Two unusual transient events, discovered by Hubble behind a strong-lensing galaxy cluster, can be explained as separate eruptions of a luminous blue variable star or a recurrent nova, or as an unrelated pair of stellar microlensing events.
Journal Article
Hydrogen-rich supernovae beyond the neutrino-driven core-collapse paradigm
Type II supernovae are the final stage of massive stars (above 8
M
⊙
) which retain part of their hydrogen-rich envelope at the moment of explosion. They typically eject up to 15
M
⊙
of material, with peak magnitudes of −17.5 mag and energies in the order of 10
51
erg, which can be explained by neutrino-driven explosions and neutron star formation. Here, we present our study of OGLE-2014-SN-073, one of the brightest type II supernovae ever discovered, with an unusually broad lightcurve combined with high ejecta velocities. From our hydrodynamical modelling, we infer a remarkable ejecta mass of
60
-
16
+
42
M
⊙
and a relatively high explosion energy of
12
.4
-
5
.9
+
13
.0
×
1
0
51
erg. We show that this object belongs, along with a very small number of other hydrogen-rich supernovae, to an energy regime that is not explained by standard core-collapse neutrino-driven explosions. We compare the quantities inferred by the hydrodynamical modelling with the expectations of various exploding scenarios and attempt to explain the high energy and luminosity released. We find some qualitative similarities with pair-instability supernovae, although the prompt injection of energy by a magnetar seems to be a viable alternative explanation for such an extreme event.
The authors present a spectrophotometric and hydrodynamical study of supernova OGLE-2014-SN-073, which had remarkably high inferred ejecta mass and energy, potentially higher than can be explained with canonical core-collapse neutrino-driven explosions.
Journal Article
The Earliest English
The Earliest English provides a student-friendly introduction to Old English and the earliest periods of the history of the English Language as it evolved before 1215. Using non-technical language, the book covers basic terminology, the linguistic and cultural backgrounds to the emergence and development of OE, and the OE vocabulary that students studying this phase of the English language need to know.
In eight carefully structured units, the authors show how the vocabulary of Old English contains many items familiar to us today; how its characteristic poetic form is based on a beautiful and intricate simplicity; how its patterns of word building and inflectional structure are paralleled in several present day languages and how and why the English language and its literature continued to change so that by the mid-12th century the English language looks more like the 'English' that we are familiar with in the 21st century. Features of the book include:
the provision of accessible guides to some important 'problem topics' of classical OE
stimulating cross-linguistic comparisons, e.g. the pronoun system of OE as compared with the pronoun system of present day Dutch
cleverly laid out translation exercises, with structural help in the form of selective glossaries
careful division into eight units, designed for both classroom use and self-study
Written in a clear and accessible manner, The Earliest English provides a comprehensive introduction to the evolution of Old English language and literature, and will be an invaluable textbook for students of English Language and Linguistics.
eBook
Generative Theory and Corpus Studies
No detailed description available for \"Generative Theory and Corpus Studies\".
eBook
Publisher Correction: Hydrogen-rich supernovae beyond the neutrino-driven core-collapse paradigm
In the version of this Article originally published the Fig. 6 y axis label read 'Mej' but should have read 'MNi'. This has now been corrected.
Journal Article
Low-redshift Type Ia Supernova from the LSQ/LCO Collaboration
This paper is the data release of a new sample of 140 type Ia supernovae (SNe Ia) from the LaSilla-QUEST/Las Cumbres Observatory (LCO) collaboration. The discovery of the supernovae came from the LaSilla-QUEST variability survey, the ASASSN survey, as well as smaller low redshift supernova surveys. All of the supernovae in this sample were spectroscopically identified as SNe Ia using spectra from the PESSTO survey using the 3.5 m NTT telescope at LaSilla and spectra from the LCO 2 m Faulkes telescopes. The light-curves were obtained from a rapid cadence photometric follow up of the supernovae with the 9 LCO 1 m telescopes located at various observatories around the globe. Reference images of the host galaxies were taken approximately a year after the supernova have faded to allow precise galaxy background subtraction from the supernova magnitudes. The supernovae in this sample were discovered over a seven year period from 2012 October to 2019 June, and the last galaxy reference images were taken before 2020 June.
Journal Article
Cost Sharing and Hereditary Cancer Risk: Predictors of Willingness-to-Pay for Genetic Testing
Increasing use of predictive genetic testing to gauge hereditary cancer risk has been paralleled by rising cost-sharing practices. Little is known about how demographic and psychosocial factors may influence individuals’ willingness-to-pay for genetic testing. The Gastrointestinal Tumor Risk Assessment Program Registry includes individuals presenting for genetic risk assessment based on personal/family cancer history. Participants complete a baseline survey assessing cancer history and psychosocial items. Willingness-to-pay items include intention for: genetic testing only if paid by insurance; testing with self-pay; and amount willing-to-pay ($25–$2,000). Multivariable models examined predictors of willingness-to-pay out-of-pocket (versus only if paid by insurance) and willingness-to-pay a smaller versus larger sum (≤$200 vs. ≥$500). All statistical tests are two-sided (α = 0.05). Of 385 evaluable participants, a minority (42 %) had a personal cancer history, while 56 % had ≥1 first-degree relative with colorectal cancer. Overall, 21.3 % were willing to have testing only if paid by insurance, and 78.7 % were willing-to-pay. Predictors of willingness-to-pay were: 1) concern for positive result; 2) confidence to control cancer risk; 3) fewer perceived barriers to colorectal cancer screening; 4) benefit of testing to guide screening (all
p
< 0.05). Subjects willing-to-pay a higher amount were male, more educated, had greater cancer worry, fewer relatives with colorectal cancer, and more positive attitudes toward genetic testing (all
p
< 0.05). Individuals seeking risk assessment are willing-to-pay out-of-pocket for genetic testing, and anticipate benefits to reducing cancer risk. Identifying factors associated with willingness-to-pay for genetic services is increasingly important as testing is integrated into routine cancer care.
Journal Article