Dennis Alp
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View article: Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A
Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A Open
JWST/NIRCam obtained high angular resolution (0.05–0.1 arcsec), deep near-infrared 1–5 $\mu$m imaging of Supernova (SN) 1987A taken 35 yr after the explosion. In the NIRCam images, we identify: (1) faint H2 crescents, which are emissions l…
View article: Luminosity Function and Event Rate Density of XMM-Newton-selected Supernova Shock Breakout Candidates
Luminosity Function and Event Rate Density of XMM-Newton-selected Supernova Shock Breakout Candidates Open
A dozen X-ray supernova shock breakout (SN SBO) candidates were reported recently based on XMM-Newton archival data, which increased the X-ray-selected SN SBO sample by an order of magnitude. Assuming that they are genuine SN SBOs, we stud…
View article: Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A
Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A Open
Supernova 1987A offers a unique opportunity to study an evolving supernova in unprecedented detail over several decades. The X-ray emission is dominated by interactions between the ejecta and the circumstellar medium, primarily the equator…
View article: Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A
Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A Open
Supernova 1987A offers a unique opportunity to study an evolving supernova in unprecedented detail over several decades. The X-ray emission is dominated by interactions between the ejecta and the circumstellar medium, primarily the equator…
View article: Properties of gamma-ray decay lines in 3D core-collapse supernova models, with application to SN 1987A and Cas A
Properties of gamma-ray decay lines in 3D core-collapse supernova models, with application to SN 1987A and Cas A Open
Comparison of theoretical line profiles to observations provides important tests for supernova explosion models. We study the shapes of radioactive decay lines predicted by current 3D core-collapse explosion simulations, and compare these …
View article: High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta
High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta Open
We present high angular resolution (∼80 mas) ALMA continuum images of the SN 1987A system, together with CO J = 2 1, J = 6 5, and SiO J = 5 4 to J = 7 6 images, which clearly resolve the ejecta (dust continuum and molecules) and ring (sync…
View article: Core-collapse Supernovae : Theory vs. Observations
Core-collapse Supernovae : Theory vs. Observations Open
A core-collapse supernova (CCSN) is an astronomical explosion that indicates the death of a massive star. The iron core of the star collapses into either a neutron star or a black hole while the rest of the material is expelled at high vel…
View article: Encountering offenders in community palliative care settings: Challenges for effective care provision.
Encountering offenders in community palliative care settings: Challenges for effective care provision. Open
Background:
\nThere is very little research into the way that offender management strategies impinge on the practices and decision-making of palliative care personnel in community settings.
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\nAims:
\nTo improve understanding of the chal…
View article: Refraction in exoplanet atmospheres
Refraction in exoplanet atmospheres Open
Context. Refraction deflects photons that pass through atmospheres, which affects transit light curves. Refraction thus provides an avenue to probe physical properties of exoplanet atmospheres and to constrain the presence of clouds and ha…
View article: Refraction in exoplanet atmospheres: Photometric signatures, implications for transmission spectroscopy, and search in Kepler data
Refraction in exoplanet atmospheres: Photometric signatures, implications for transmission spectroscopy, and search in Kepler data Open
Refraction deflects photons that pass through atmospheres, which affects transit light curves. Refraction thus provides an avenue to probe physical properties of exoplanet atmospheres and to constrain the presence of clouds and hazes. In a…