A5034396823- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Nuclear physics research studies
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Molecular Communication and Nanonetworks
- Neutrino Physics Research
- Photocathodes and Microchannel Plates
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
University of California, Berkeley
2018-2022
Lawrence Berkeley National Laboratory
2018
Abstract Simplified analytic methods are frequently used to model the light curves of supernovae and other energetic transients extract physical quantities, such as ejecta mass amount radioactive heating. The applicability quantitative accuracy these models, however, have not been clearly delineated. Here we carry out a systematic study comparing certain models numerical radiation transport calculations. We show that neglect time-dependent diffusion limits common Arnett-like widely applied...
We present AT2020mrf (SRGe J154754.2$+$443907), an extra-galactic ($z=0.1353$) fast blue optical transient (FBOT) with a rise time of $t_{g,\rm rise}=3.7$ days and peak luminosity $M_{g,\rm peak}=-20.0$. Its spectrum around shows broad ($v\sim0.1c$) emission feature on continuum ($T\sim2\times10^4$ K), which bears striking resemblance to AT2018cow. bright radio ($\nu L_\nu = 1.2\times 10^{39}\,{\rm erg\,s^{-1}}$; $\nu_{\rm rest}= 7.4$ GHz; 261 days) is similar four other AT2018cow-like...
Abstract We present panchromatic observations and modeling of the Calcium-rich supernova (SN) 2019ehk in star-forming galaxy M100 ( d ≈ 16.2 Mpc) starting 10 hr after explosion continuing for ∼300 days. SN shows a double-peaked optical light curve peaking at t = 3 15 The first peak is coincident with luminous, rapidly decaying Swift-XRT–discovered X-ray emission <?CDATA ${L}_{{\rm{x}}}\approx {10}^{41}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$?> days; L x ∝ −3 ), Shane/Kast spectral detection narrow H...
We perform a systematic study of the $^{56}$Ni mass ($M_{\rm Ni}$) 27 stripped envelope supernovae (SESNe) by modeling their light-curve tails, highlighting that use ``Arnett's rule'' overestimates $M_{\rm Ni}$ for SESN factor $\sim$2. Recently, \citet{Khatami2019} presented new model relating peak time ($t_{\rm p}$) and luminosity ($L_{\rm radioactive-powered SN to its addresses several limitations Arnett-like models, but depends on dimensionless parameter, $β$. Using observed $t_{\rm p}$,...
We present panchromatic observations and modeling of calcium-strong supernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5 Mpc) 2021inl outskirts elliptical 4923 80 Mpc), both monitored through Young Supernova Experiment (YSE) transient survey. The multi-color light curves SNe show two peaks, former peak being derived from shock cooling emission (SCE) and/or interaction with circumstellar material (CSM). primary SN is coincident luminous, rapidly decaying X-ray ($L_x 5...
The interaction of supernova ejecta with a surrounding circumstellar medium (CSM) generates strong shock which can convert the kinetic energy into observable radiation. Given diversity potential CSM structures (arising from diverse mass loss processes such as late-stage stellar outbursts, binary interaction, and winds), resulting transients display wide range light curve morphologies. We provide framework for classifying arising spherical shell. curves are decomposed five consecutive phases,...
Abstract The interaction of supernova ejecta with a surrounding circumstellar medium (CSM) generates strong shock, which can convert kinetic energy into observable radiation. Given the diversity potential CSM structures (arising from diverse mass-loss processes such as late-stage stellar outbursts, binary interaction, and winds), resulting transients display wide range light-curve morphologies. We provide framework for classifying arising spherical shell. light curves are decomposed five...
Abstract We present detailed observations of ZTF18abukavn (SN2018gep), discovered in high-cadence data from the Zwicky Transient Facility as a rapidly rising (1.4 ± 0.1 mag hr −1 ) and luminous ( mag) transient. It is spectroscopically classified broad-lined stripped-envelope supernova (Ic-BL SN). The high peak luminosity ), short rise time g band), blue colors at all resemble high-redshift Ic-BL iPTF16asu, well several other unclassified fast transients. early discovery SN2018gep (within an...
For decades optical time-domain searches have been tuned to find ordinary supernovae, which rise and fall in brightness over a period of weeks. Recently, supernova improved their cadences handful fast-evolving luminous transients (FELTs) identified. FELTs peak luminosities comparable Type Ia but maximum $<10$ days fade from view $
We present panchromatic observations and modeling of calcium-strong supernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5 Mpc) 2021inl outskirts elliptical 4923 80 Mpc), both monitored through Young Supernova Experiment (YSE) transient survey. The multi-color light curves SNe show two peaks, former peak being derived from shock cooling emission (SCE) and/or interaction with circumstellar material (CSM). primary SN is coincident luminous, rapidly decaying X-ray ($L_x 5...