A5085760495- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Spacecraft and Cryogenic Technologies
- Particle physics theoretical and experimental studies
- Spectroscopy and Laser Applications
- Nuclear Physics and Applications
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
KTH Royal Institute of Technology
2017-2024
AlbaNova
2017-2024
We present high angular resolution (~80 mas) ALMA continuum images of the SN 1987A system, together with CO $J$=2 $\!\rightarrow\!$ 1, $J$=6 5, and SiO $J$=5 4 to $J$=7 6 images, which clearly resolve ejecta (dust molecules) ring (synchrotron continuum) components. Dust in is asymmetric clumpy, overall dust fills spatial void seen H$\alpha$ filling that region material from heavier elements. The clumps generally fill space where 5 fainter, tentatively indicating these are locationally...
Abstract Despite more than 30 years of searching, the compact object in Supernova (SN) 1987A has not yet been detected. We present new limits on SN using millimeter, near-infrared, optical, ultraviolet, and X-ray observations from ALMA, VLT, HST , Chandra . The are approximately 0.1 mJy ( <?CDATA $0.1\times {10}^{-26}$?> erg s −1 cm −2 Hz ) at 213 GHz, 1 L ⊙ $6\times {10}^{-29}$?> optical if our line sight is free ejecta dust, 10 36 $2\times {10}^{-30}$?> 2–10 keV X-rays. Our an order...
Abstract The first electromagnetic signal from a supernova (SN) is released when the shock crosses progenitor surface. This breakout (SBO) emission provides constraints on and explosion properties. Observationally, SBOs appear as minute- to hour-long extragalactic X-ray transients. They are challenging detect only one SBO has been observed date. Here, we search XMM-Newton archive find 12 new SN candidates. We identify host galaxies nine of these at estimated redshifts 0.1–1. candidates have...
Abstract The nearby SN 1987A offers a spatially resolved view of the evolution young supernova (SN) remnant. Here we present recent Hubble Space Telescope imaging observations 1987A, which use to study ejecta, circumstellar equatorial ring (ER), and increasing emission from material outside ER. We find that inner ejecta have been brightening at gradually slower rate western side has brighter than eastern since ∼7000 days. This is expected given X-rays ER are most likely powering emission. At...
ABSTRACT Comparison of theoretical line profiles to observations provides important tests for supernova explosion models. We study the shapes radioactive decay lines predicted by current 3D core-collapse simulations, and compare these SN 1987A Cas A. Both widths shifts vary several thousand kilometres per second depending on viewing angle. The can be complex with multiple peaks. By combining observational constraints from 56Co lines, 44Ti Fe IR we delineate a picture morphology explosive...
Abstract 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 circumstellar medium, primarily equatorial ring (ER). We analyze 3.3 Ms of NuSTAR data obtained 2012 2020, two decades XMM-Newton data. Since ∼2013, flux below 2 keV has declined, 3–8 increased but started flatten, above 10 remained nearly constant. spectra are well described model with three...
ABSTRACT 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 NIRCam images, we identify: (1) faint H2 crescents, which are emissions located between ejecta and equatorial ring, (2) a bar, is substructure ejecta, (3) bright 3–5 continuum emission exterior to ring. The remnant in 1–2.3 images mostly due line emission, emitted hotspots within contrast, dominated by emission. dust,...
During the first few hundred days after explosion, core-collapse supernovae (SNe) emit down-scattered X-rays and gamma-rays originating from radioactive line emissions, primarily $^{56}$Ni $\rightarrow$ $^{56}$Co $^{56}$Fe chain. We use SN models based on three-dimensional neutrino-driven explosion simulations of single stars mergers to compute this emission compare predictions with observations 1987A. A number are clearly excluded, showing that high-energy is a powerful way discriminating...
The material expelled by core-collapse supernova (SN) explosions absorbs X-rays from the central regions. We use SN models based on three-dimensional neutrino-driven to estimate optical depths center of explosion, compare different progenitor models, and investigate effects explosion asymmetries. below 2 keV for progenitors with a remaining hydrogen envelope are expected be high during first century after due photoabsorption. A typical depth is $100 t_4^{-2} E^{-2}$, where $t_4$ time since...
Context. Refraction deflects photons that pass through atmospheres, which affects transit light curves. thus provides an avenue to probe physical properties of exoplanet atmospheres and constrain the presence clouds hazes. In addition, effective surface can be imposed by refraction, thereby limiting pressure levels probed transmission spectroscopy. Aims. The main objective paper is model effects refraction on photometric curves for realistic planets explore dependencies atmospheric...
A dozen X-ray supernova shock breakout (SN SBO) candidates were reported recently based on XMM-Newton archival data, which increased the selected SN SBO sample by an order of magnitude. Assuming they are genuine SBOs, we study luminosity function (LF) improving upon method used in our previous work. The light curves and spectra to derive maximum volume within these objects could be detected with simulation. results show that LF can described either a broken power law (BPL) indices (at 68$\%$...