Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment

In this Letter we report a discovery of a prominent flash of a peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5 hr of the supernova explosion by the first wide-field mosaic CMOS sensor imager, the Tomo-e Gozen Camera. The fast evolution of the early flash was captured by intensive intranight observations via the Tomo-e Gozen high-cadence survey. Numerical simulations show that such a prominent and fast early emission is most likely generated from an interaction between 0.01 M ⊙ circumstellar material (CSM) extending to a distance of ∼1013 cm and supernova ejecta soon after the explosion, indicating a confined dense CSM formation at the final evolution stage of the progenitor of SN 2020hvf. Based on the CSM–ejecta interaction-induced early flash, the overluminous light curve, and the high ejecta velocity of SN 2020hvf, we suggest that the SN 2020hvf may originate from a thermonuclear explosion of a super-Chandrasekhar-mass white dwarf (“super-M Ch WD”). Systematical investigations on explosion mechanisms and hydrodynamic simulations of the super-M Ch WD explosion are required to further test the suggested scenario and understand the progenitor of this peculiar supernova.

P061 ANALYSIS OF THE IMPACT DERIVED FROM MORBIDITY IN THE INCISIONAL HERNIA SURGERY

Aim To analyse the repercussion derived from the morbidity that appeared after the repair of incisional hernias. Material and Methods Descriptive, retrospective and longitudinal study based on a prospective database of all incisional hernia operated patients of a university-level hospital in the period between 2013 and 2019. Anthropometric parameters, classification of the hernia according to the European Hernia Society guides and characteristics of the intervention performed were registered. Complications observed until the end of the follow-up and the final evolution are analysed. Results The sample is composed by 244 patients with a mean follow-up of 11 months. In 50% of the surgeries anterior separation of components was performed. In 240 patients, the mesh was placed in the following positions: 68.5% onlay, 13.5% retromuscular, 13% preperitoneal, 3.6% intraperitoneal and 1.3% inlay. During the first postoperative month, 63 patients (25.8%) presented some type of complication: seroma (47.6%), surgical wound infection (20.6%) and dehiscence (17.5%). 31 complications (49.2%) were classified as Clavien-Dindo III or greater severity. In 60% of patients with seroma the mesh was placed onlay. Of the 30 patients with seroma, 9 recurred over a mean of 16 months of follow-up (30%). Conclusions In our sample, the main cause of postoperative seroma is onlay placement of the mesh, and this complication may cause recurrence. We consider that it’s important to register our results to obtain a correct analysis and to prevent morbidity in the future.

Analytical Solution and Quasi-Periodic Behavior of a Charged Dilaton Black Hole

With the vast breakthrough brought by the Event Horizon Telescope, the theoretical analysis of various black holes has become more critical than ever. In this paper, the second-order asymptotic analytical solution of the charged dilaton black hole flow in the spinodal region is constructed from the perspective of dynamics by using the two-timing scale method. Through a numerical comparison with the original charged dilaton black hole system, it is found that the constructed analytical solution is highly consistent with the numerical solution. In addition, several quasi-periodic motions of the charged dilaton black hole flow are numerically obtained under different groups of irrational frequency ratios, and the phase portraits of the black hole flow with sufficiently small thermal parameter perturbation display good stability. Finally, the final evolution state of black hole flow over time is studied according to the obtained analytical solution. The results show that the smaller the integral constant of the system, the greater the periodicity of the black hole flow.

Constrictive pericarditis

Constrictive pericarditis is a pericardial syndrome where the pericardium becomes relatively rigid and inelastic, may be thickened and calcified or not, and impairs mid to late diastolic filling. Constrictive pericarditis is the final pathway of several different diseases or causes, usually starting from pericarditis and pericardial effusion, and progressing towards pericardial fibrosis and calcification. Constrictive pericarditis is commonly the final evolution of any type of pericarditis and pericardial effusion. The risk of developing such evolution is especially related to the aetiology. The risk of progression is especially related to the aetiology: low (<1%) in viral and idiopathic pericarditis, intermediate (2–5%) in immune-mediated pericarditis and neoplastic pericardial diseases, and high (20–30%) in bacterial pericarditis, especially purulent pericarditis. It is important to recognize transient (subacute) constrictive pericarditis early on in the process versus calcific chronic constrictive pericarditis.

Baitul Rahmah: a Final Evolution of The Malay Classical Style Amidst Change

The paper highlights the significance and position of the Baitul Rahmah, an early 20th-century mansion in Kuala Kangsar, Perak, Malaysia, as a key milestone of stylistic evolvement of local vernacular architecture. Its form embodies, a typological variation at a time of growing Colonial imperialism, while its grammar and language refers to early modern stylistic expression reflecting the fundamental principles of indigenous architecture. The Baitul Rahmah brings to light how a final evolution and epitome of the vernacular projects an identity as a cosmopolitan manifestation. Its internal ornamentation recalls the stylized forms of local motifs and reflect a form of control and minimalism; i.e. an ‘ornamental decorum’. Its wood-carved expressions seem stylised into increasing ‘modernised’ simplication and modularity, while its masonry- timber structure reflect the identity of hybridity in architecture which symbolise the tensions of local communities as they step into the 1900s into a global context.

Formation of single-moon systems around gas giants

Context. Several mechanisms have been proposed to explain the formation process of satellite systems, and relatively large moons are thought to be born in circumplanetary disks. Making a single-moon system is known to be more difficult than multiple-moon or moonless systems. Aims. We aim to find a way to form a system with a single large moon, such as Titan around Saturn. We examine the orbital migration of moons, which change their direction and speed depending on the properties of circumplanetary disks. Methods. We modeled dissipating circumplanetary disks with taking the effect of temperature structures into account and calculated the orbital evolution of Titan-mass satellites in the final evolution stage of various circumplanetary disks. We also performed N-body simulations of systems that initially had multiple satellites to see whether single-moon systems remained at the end. Results. The radial slope of the disk-temperature structure characterized by the dust opacity produces a patch of orbits in which the Titan-mass moons cease inward migration and even migrate outward in a certain range of the disk viscosity. The patch assists moons initially located in the outer orbits to remain in the disk, while those in the inner orbits fall onto the planet. Conclusions. We demonstrate for the first time that systems can form that have only one large moon around giant planet. Our N-body simulations suggest satellite formation was not efficient in the outer radii of circumplanetary disks.

NASE workshop: Eclipses with models and camera obscura

Ibn al-Haytham (known as Alhazen in occident), extensively studied the camera obscura phenomenon in the early 11th century. This instrument was used to obtain the projected image of a landscape on the screen and also was addopte by the scientists and famous painters along the centuries, to experiment with it until their final evolution as the modern photografic camera. The resource in the simple version of the “pinhole camera” can be used at the classroom to experience several phenomena, such us solar eclipses and Moon phases, and to each about optics and geometry. This contribution presents an application of this ingeniuos tool in the framework of solar eclipses, where the scale models are important to understand what really happens with the Sun-Earth-Moon system.

Final evolution of super-AGB stars and supernovae triggered by electron capture

Stars of 8–10 M⊙ form a strongly electron-degenerate oxygen–neon–magnesium core which is more massive than ∼1.1 M⊙, and become super-Asymptotic Giant Branch stars. The oxygen–neon–magnesium core increases its mass through H and He shell burning. The core contracts accordingly and the central density increases. In the high density core, electron capture takes place and further boosts the core contraction. When electron capture on 20Ne starts, it induces oxygen–neon deflagration. It remains a theoretical question whether neutron star can be formed after the deflagration has started. If the star collapses, the following explosion is known as an electron capture supernova. In this article, we give a brief overview on the development of idea in the presupernova evolution and the hydrodynamics behaviour of electron capture supernovae. Using standard stellar evolutionary models that show rather high ignition density, we show that the collapse can occur in a wide range of model parameter. However, future study remains important. We also review the possible observables of electron capture supernovae and discuss their applications to the light curve model for the Crab supernova 1054.