A5068913849- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Optical Systems and Laser Technology
- Advanced Power Generation Technologies
- Nuclear Engineering Thermal-Hydraulics
- Galaxies: Formation, Evolution, Phenomena
- Trauma Management and Diagnosis
- Earthquake Detection and Analysis
- CCD and CMOS Imaging Sensors
- Cardiac Arrest and Resuscitation
- Influenza Virus Research Studies
- Marine and Coastal Research
Johns Hopkins University
2021-2024
Bloomberg (United States)
2024
We present panchromatic observations and modeling of supernova (SN) 2020tlf, the first normal type II-P/L SN with confirmed precursor emission, as detected by Young Supernova Experiment transient survey Pan-STARRS1 telescope. Pre-explosion emission was in $riz-$bands at 130 days prior to 2020tlf persisted relatively constant flux until light. Soon after discovery, "flash" spectroscopy revealed prominent narrow symmetric lines ($v_w < 300$ km s$^{-1}$) that resulted from photo-ionization...
Abstract We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early time ( δ t < 2 days) spectra show transient, narrow emission lines from shock ionization confined r 10 15 cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) H i , He i/ii C iv N iii/iv/v the CSM persist on a characteristic timescale IIn ) that marks transition to lower-density emergence Doppler-broadened...
Time domain science has undergone a revolution over the past decade, with tens of thousands new supernovae (SNe) discovered each year. However, several observational domains, including SNe within days or hours explosion and faint, red transients, are just beginning to be explored. Here, we present Young Supernova Experiment (YSE), novel optical time-domain survey on Pan-STARRS telescopes. Our is designed obtain well-sampled $griz$ light curves for transient events up $z \approx 0.2$. This...
We present optical and near-infrared (NIR) observations of the Type Icn supernova (SN Icn) 2022ann, fifth member its newly identified class SNe. Its early spectra are dominated by narrow carbon oxygen P-Cygni features with absorption velocities 800 km/s; slower than other SNe indicative interaction a dense, H/He-poor circumstellar medium (CSM) that is outflowing typical Wolf-Rayet wind velocity $>$1000 km/s. identify helium in NIR obtained two weeks after maximum at three weeks,...
ABSTRACT A growing number of supernovae (SNe) are now known to exhibit evidence for significant interaction with a dense, pre-existing, circumstellar medium (CSM). SNe Ibn comprise one such class that can be characterized by both rapidly evolving light curves and persistent narrow He i lines. The origin dense CSM in these systems remains pressing question, specifically concerning the progenitor system mass-loss mechanism. In this paper, we present multiwavelength data Type SN 2020nxt,...
We present panchromatic observations and modeling of calcium-strong supernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5 Mpc) 2021inl outskirts elliptical 4923 80 Mpc), both monitored through Young Supernova Experiment (YSE) transient survey. The multi-color light curves SNe show two peaks, former peak being derived from shock cooling emission (SCE) and/or interaction with circumstellar material (CSM). primary SN is coincident luminous, rapidly decaying X-ray ($L_x 5...
Abstract We present a new photometric pipeline for the detection of pre-supernova (pre-SN) emission in Young Supernova Experiment (YSE) sky survey. The method described is applied to SN 2020tlf, type II with precursor last ~100 days before first light. re-analyze YSE griz -band light curves 2020tlf and provide revised pre-explosion photometry that includes robust list confident limiting magnitudes. Compared results W. V. Jacobson-Galán et al., this analysis yields fewer total r / i z pre-SN...
Abstract In an effort to search for faint sources of emission over arbitrary timescales, we present a novel method analyzing forced photometry light curves in difference imaging from optical surveys. Our “ATLAS Clean,” or ATClean, utilizes the reported fluxes, uncertainties, and fits point-spread function (PSF) images quantify statistical significance individual measurements. We apply this control across image determine whether any source flux is data range specific timescales. From ATLAS o...
Abstract We present the most comprehensive catalog to date of Type I Superluminous Supernovae (SLSNe), a class stripped envelope supernovae (SNe) characterized by exceptionally high luminosities. have compiled sample 262 SLSNe reported through 2022 December 31. verified spectroscopic classification each SLSN and collated an exhaustive data set UV, optical IR photometry totaling over 30,000 photometric detections. Using these we derive observational parameters such as peak absolute...
ABSTRACT We present observations from X-ray to mid-infrared wavelengths of the most energetic non-quasar transient ever observed, AT2021lwx. Our data show a single optical brightening by factor &gt;100 luminosity 7 × 1045 erg s−1 and total radiated energy 1.5 1053 erg, both greater than any known transient. The decline is smooth exponential ultraviolet–optical spectral distribution resembles blackbody with temperature 1.2 104 K. Tentative detections indicate secondary mode emission,...
We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early-time ($\delta t < 2$ days) spectra show transient, narrow emission lines from shock ionization confined ($r 10^{15}$ cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) HI, He I/II, C III/IV, N III/IV/V the CSM persist on a characteristic timescale ($t_{\rm IIn}$) that marks transition to lower-density emergence...
We present the 30-min cadence Kepler/K2 light curve of Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, full rise phase and decline until 40 days after peak. additionally ground-based observations in multiple bands within same time range, including 1-day DECam first $\sim$5 light. The Kepler early is fully consistent with a single power-law rise, without evidence any bump feature. compare 2018agk sample other SNe~Ia excess flux from literature. find...
Abstract Gamma-ray bursts produce afterglows that can be observed across the electromagnetic spectrum and provide insight into nature of their progenitors. While most telescopes observe are designed to rapidly react trigger information, Transiting Exoplanet Survey Satellite (TESS) continuously monitors sections sky at cadences between 30 minutes 200 s. This provides TESS with capability serendipitously observing optical afterglow GRBs. We conduct first extensive search for known GRBs in...
Abstract We present the photometric and spectroscopic evolution of SN 2022oqm, a nearby multipeaked hydrogen- helium-weak calcium-rich transient (CaRT). 2022oqm was detected 13.1 kpc from its host galaxy, face-on spiral galaxy NGC 5875. Extensive coverage reveals an early hot ( T ≥ 40,000 K) continuum carbon features observed ∼1 day after discovery, Ic-like photospheric-phase spectra, strong forbidden calcium emission starting 38 days discovery. has relatively high peak luminosity M B = −17...
We present the photometric and spectroscopic evolution of SN 2022oqm, a nearby multi-peaked hydrogen- helium-weak calcium-rich transient (CaRT). 2022oqm was detected 13.1 kpc from its host galaxy, face-on spiral galaxy NGC 5875. Extensive coverage reveals an early hot (T >= 40,000 K) continuum carbon features observed $\sim$1~day after discovery, Ic-like photospheric-phase spectra, strong forbidden calcium emission starting 38 days discovery. has relatively high peak luminosity (MB = -17...
We present multi-band ATLAS photometry for SN 2019tsf, a stripped-envelope Type Ib supernova (SESN). The shows triple-peaked light curve and late (re-)brightening, making it unique among systems. re-brightening observations represent the latest photometric measurements of multi-peaked to date. As late-time spectroscopy suggest no hydrogen, potential circumstellar material (CSM) must be H-poor. Moreover, (>150 days) spectra show signs narrow emission lines, further disfavouring CSM...
A growing number of supernovae (SNe) are now known to exhibit evidence for significant interaction with a dense, pre-existing, circumstellar medium (CSM). SNe Ibn comprise one such class that can be characterised by both rapidly evolving light curves and persistent narrow He I lines. The origin dense CSM in these systems remains pressing question, specifically concerning the progenitor system mass-loss mechanism. In this paper, we present multi-wavelength data Type SN 2020nxt, including...
We present the most comprehensive catalog to date of Type I Superluminous Supernovae (SLSNe), a class stripped envelope supernovae (SNe) characterized by exceptionally high luminosities. have compiled sample 262 SLSNe reported through 2022 December 31. verified spectroscopic classification each SLSN and collated an exhaustive data set UV, optical IR photometry from both publicly available our own FLEET observational follow-up program, totaling over 30,000 photometric detections. Using these...
We present a comprehensive analysis of the photometric and spectroscopic evolution SN~2021foa, unique among class transitional supernovae for repeatedly changing its appearance from hydrogen-to-helium-to-hydrogen-dominated (IIn-to-Ibn-to-IIn) within 50 days past peak brightness. The spectra exhibit multiple narrow ($\approx$ 300--600~km~s$^{-1}$) absorption lines hydrogen, helium, calcium iron together with broad helium emission full-width-at-half-maximum (FWHM) $\sim 6000$~km~s$^{-1}$. For...
Abstract We present a comprehensive analysis of the photometric and spectroscopic evolution SN 2021foa, unique among class transitional supernovae for repeatedly changing its appearance from hydrogen-to-helium-to-hydrogen dominated (IIn-to-Ibn-to-IIn) within 50 days past peak brightness. The spectra exhibit multiple narrow (≈300–600 km s −1 ) absorption lines hydrogen, helium, calcium, iron together with broad helium emission full width at half-maximum (FWHM) ∼6000 . For steady, wind...
Nova eruptions, thermonuclear explosions on the surfaces of white dwarfs (WDs), are now recognized to be among most common shock-powered astrophysical transients. We present early discovery and rapid ultraviolet (UV), optical, infrared (IR) temporal development AT 2019qyl, a recent nova in nearby Sculptor Group galaxy NGC 300. The light curve shows rise lasting $\lesssim 1$ day, reaching peak absolute magnitude $M_V = -9.2$ mag, very fast decline, fading by 2 mag over 3.5 days. A steep...
In an effort to search for faint sources of emission over arbitrary timescales, we present a novel method analyzing forced photometry light curves in difference imaging from optical surveys. Our "ATLAS Clean'' or ATClean, utilizes the reported fluxes, uncertainties, and fits point-spread function images quantify statistical significance individual measurements. We apply this control across image determine whether any source flux is data range specific timescales. From ATLAS $o$-band at site...
We present the discovery and early observations of nearby Type II supernova (SN) 2024ggi in NGC 3621 at 6.64 +/- 0.3 Mpc. The SN was caught 5.8 (+1.9 -2.9) hours after its explosion by ATLAS survey. Early-phase, high-cadence, multi-band photometric follow-up performed Kinder (Kilonova Finder) project, collecting over 1000 data points within a week. combined o- r-band light curves show rapid rise 3.3 magnitudes 13.7 hours, much faster than 2023ixf (another recent, nearby, well-observed II)....
We present early observations and analysis of the double-peaked Type IIb supernova (SN IIb) 2021zby. $TESS$ captured prominent shock cooling peak SN 2021zby within first $\sim$10 days after explosion with a 30-minute cadence. optical near-infrared spectral series 2021zby, including three spectra during phase. Using multi-band model fit, we find that inferred properties its progenitor are consistent red supergiant or yellow supergiant, an envelope mass $\sim$0.3-3.0 M$_\odot$ radius...