Avery Wold
A5000390924- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Subatomic Physics Research
- Atmospheric and Environmental Gas Dynamics
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Mathematics, Computing, and Information Processing
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Isotope Analysis in Ecology
- Neutrino Physics Research
- Radioactivity and Radon Measurements
- Radiation Therapy and Dosimetry
- Impact of Light on Environment and Health
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
California Institute of Technology
2023-2025
Infrared Processing and Analysis Center
2023-2025
Abstract We present volume-limited samples of cataclysmic variables (CVs) and AM CVn binaries jointly selected from SRG/eROSITA eRASS1 Gaia DR3 using an X-ray + optical color–color diagram (the “X-ray Main Sequence”). This tool identifies all CV subtypes, including magnetic low-accretion rate systems, in contrast to most previous surveys. find 23 CVs, 3 which are CVns, out 150 pc the Western Galactic Hemisphere. Our sample is spectroscopically verified complete down L X = 1.3 × 10 29 erg s...
SkyPortal is an open-source software package designed to efficiently discover interesting transients, manage follow-up, perform characterization, and visualize the results. By enabling fast access archival catalog data, cross-matching heterogeneous data streams, triggering monitoring of on-demand observations for further a SkyPortal-based platform has been operating at scale 2 yr Zwicky Transient Facility Phase II community, with hundreds users, containing tens millions time-domain sources,...
Detecting gravitationally lensed supernovae is among the biggest challenges in astronomy. It involves a combination of two very rare phenomena: catching transient signal stellar explosion distant galaxy and observing it through nearly perfectly aligned foreground that deflects light towards observer. Here we describe how high-cadence optical observations with Zwicky Transient Facility, its unparalleled large field view, led to detection multiply imaged type Ia supernova, SN Zwicky, also...
Abstract We report observations of the optical counterpart long gamma-ray burst (GRB) GRB 230812B and its associated supernova (SN) SN 2023pel. The proximity ( z = 0.36) high energy E γ ,iso ∼ 10 53 erg) make it an important event to study as a probe connection between massive star core collapse relativistic jet formation. With phenomenological power-law model for afterglow, we find late-time flattening consistent with presence SN. 2023pel has absolute peak r -band magnitude M −19.46 ± 0.18...
Abstract We present the discovery and analysis of SN 2022oqm, a Type Ic supernova (SN) detected <1 day after explosion. The rises to blue short-lived (2 days) initial peak. Early-time spectral observations 2022oqm show hot (40,000 K) continuum with high ionization C O absorption features at velocities 4000 km s −1 , while its photospheric radius expands 20,000 indicating pre-existing distribution expanding C/O material. After ∼2.5 days, both spectrum light curves evolve into those typical...
Abstract White dwarfs (WDs) are the most abundant compact objects, and recent surveys have suggested that over a third of WDs in accreting binaries host strong ( B ≳ 1 MG) magnetic field. However, origin evolution WD magnetism remain under debate. Two pulsars, AR Sco J191213.72–441045.1 (J1912), been found, which non-accreting hosting rapidly spinning (1.97 minutes 5.30 minutes, respectively) WDs. The is slowing down on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Obtaining spectroscopic observations of the progenitors core-collapse supernovae is often unfeasible, due to an inherent lack knowledge as what stars experience and when they will explode. In this Letter we present photometric progenitor activity SN 2023fyq before He-rich explodes a Type Ibn supernova. The shows exponential rise in flux prior core collapse. Complex He I emission line features are observed spectra, with P Cygni-like profile, well evolving broad base velocities order 10 000 km...
Abstract Multipeaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility. Here, we present observations analysis of SN 2023aew, which showed a increase brightness following an initial luminous (−17.4 mag) long (∼100 days) unusual first peak (possibly precursor). 2023aew was classified as Type IIb supernova during changed its...
White dwarfs (WDs) are the most abundant compact objects, and recent surveys have suggested that over a third of WDs in accreting binaries host strong (B $\gtrsim$ 1 MG) magnetic field. However, origin evolution WD magnetism remain under debate. Two pulsars, AR Sco J191213.72-441045.1 (J1912), been found, which non-accreting hosting rapidly spinning (1.97-min 5.30-min, respectively) WDs. The is slowing down on $P/\dot{P}\approx 5.6\times 10^6$ yr timescale. It believed they will eventually...
Abstract We present multi-wavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading (Δmr = 2.2 mag in Δt 0.74 days), luminous (Mr ∼ −30.0 mag) and red (g − r 0.50 transient at z 2.28 with accompanying radio emission. AT 2023sva does not possess a γ-ray burst (GRB) counterpart to isotropic equivalent energy limit Eγ, iso &lt; 1.6 × 1052 erg, determined through searching satellite archives between the last non-detection first detection, making it sixth example...
Hydrogen-rich superluminous supernovae (SLSNe II) are rare. The exact mechanism producing their extreme light curve peaks is not understood. Analysis of single events and small samples suggest that circumstellar material (CSM) interaction the main responsible for observed features. However, other mechanisms cannot be discarded. Large sample analysis can provide clarification. We aim to characterize curves a 107 SLSNe II valuable information used validate theoretical models. analyzed gri...
Abstract In this work, we use the Jansky Very Large Array Sky Survey to compile first sample of six radio-selected tidal disruption events (TDEs) with transient optical counterparts. While still lack statistics do detailed population studies TDEs, these suggest trends in host galaxy and light-curve properties that may correlate presence radio emission hence can inform optically selected TDE follow-up campaigns. We find tentative TDEs tend have faint cool flares, as well galaxies low...
Eruptive mass loss of massive stars prior to supernova (SN) explosion is key understanding their evolution and end fate. An observational signature pre-SN the detection an early, short-lived peak radioactive-powered in lightcurve SN. This usually attributed SN shock passing through extended envelope or circumstellar medium (CSM). Such early common for double-peaked Type IIb SNe with Hydrogen but uncommon normal Ibc very compact progenitors. In this paper, we systematically study a sample 14...
Obtaining spectroscopic observations of the progenitors core-collapse supernovae is often unfeasible due to an inherent lack knowledge as which stars will go supernova and when they explode. In this letter, we present photometric progenitor activity SN 2023fyq in preceding 150 days before He-rich exploded a Type Ibn supernova. The shows exponential rise flux prior core-collapse. Complex He I emission line features are observed, with P-Cygni like profile, well evolving broad base velocities...
Multi-peaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility (ZTF). Here, we present observations analysis of SN 2023aew, which showed a increase brightness following an initial luminous (-17.4 mag) long (~100 days) unusual first peak (possibly precursor). 2023aew was classified as Type IIb supernova during changed its type...
We present SN 2023zaw $-$ a sub-luminous ($\mathrm{M_r} = -16.7$ mag) and rapidly-evolving supernova ($\mathrm{t_{1/2,r}} 4.9$ days), with the lowest nickel mass ($\approx0.002$ $\mathrm{M_\odot}$) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He I Ca NIR emission lines velocities of $\sim10\ 000 - 12\ 000$ $\mathrm{km\ s^{-1}}$. late-time show prominent narrow at $\sim$1000$\ \mathrm{km\ s^{-1}}$, indicative interaction...
During the first half of fourth observing run (O4a) International Gravitational Wave Network (IGWN), Zwicky Transient Facility (ZTF) conducted a systematic search for kilonova (KN) counterparts to binary neutron star (BNS) and star-black hole (NSBH) merger candidates. Here, we present comprehensive study five high-significance (FAR < 1 per year) BNS NSBH candidates in O4a. Our follow-up campaigns relied on both target-of-opportunity observations (ToO) re-weighting nominal survey schedule...
Abstract We present SN 2023zaw—a subluminous ( M r = −16.7 mag) and rapidly evolving supernova t 1/2, 4.9 days), with the lowest nickel mass (≈0.002 ⊙ ) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He i Ca near-infrared emission lines velocities of ∼10,000−12,000 km s −1 . late-time show prominent narrow at ∼1000 , indicative interaction He-rich circumstellar material. 2023zaw is located in spiral arm a star-forming...
Aims. Cataclysmic variables (CVs) are compact binary systems in which a white dwarf accretes matter from Roche-lobe-filling companion star. For this study we searched for new CVs the Milky Way Chandra Source Catalog v2.0, cross-matched with Gaia Data Release 3 (DR3). Methods. We identified CV candidates by combining X-ray and optical data color-color diagram called main sequence. used two different cuts to compile pure optically variable samples of candidates. undertook spectroscopic...
Abstract We present the tidal disruption event (TDE) AT2022lri, hosted in a nearby (≈144 Mpc) quiescent galaxy with low-mass massive black hole (10 4 M ⊙ < BH 10 6 ). AT2022lri belongs to TDE-H+He subtype. More than 1 Ms of X-ray data were collected NICER, Swift, and XMM-Newton from 187 672 days after peak. The luminosity gradually declined 1.5 × 44 erg s −1 43 remains much above UV optical luminosity, consistent super-Eddington accretion flow viewed face-on. Sporadic strong dips atop...
We describe the Zwicky Transient Facility (ZTF) Forced Photometry Service (ZFPS) as developed and maintained by ZTF Science Data System Team at IPAC/Caltech. The service is open for public use following a subscription. ZFPS has been operational since early 2020 used to generate publication quality lightcurves myriad of science programs. recently upgraded allow users request forced-photometry up 1500 sky positions per in single web-application submission. underlying software recoded take...
We present the first homogeneous release of several thousand Type Ia supernovae (SNe Ia), all having spectroscopic classification, and redshifts for half sample. This release, named "DR2", contains 3628 nearby (z < 0.3) SNe discovered, followed classified by Zwicky Transient Facility survey between March 2018 December 2020. Of these, 3000 have good-to-excellent sampling 2667 pass standard cosmology light-curve quality cuts. is thus largest SN to date, increasing an order magnitude number...
Abstract Microlensing has a unique advantage for detecting dark objects in the Milky Way, such as free-floating planets, neutron stars, and stellar-mass black holes. Most microlensing surveys focus on Galactic bulge, where higher stellar density leads to event rate. However, events plane have closer lenses longer timescales, which greater chance of measuring microlens parallax, providing an additional constraint mass lens. This work searches Zwicky Transient Facility (ZTF) Data Release 17...