A5045140221- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Optical Systems and Laser Technology
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Integrated Circuits and Semiconductor Failure Analysis
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Optical Network Technologies
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Semiconductor Lasers and Optical Devices
- Advanced Optical Sensing Technologies
- Geological and Geophysical Studies
- SAS software applications and methods
- Radio Astronomy Observations and Technology
- Photonic and Optical Devices
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
Stockholm University
2017-2024
AlbaNova
2017-2024
California Institute of Technology
2016-2023
Center for Astrophysics Harvard & Smithsonian
2011-2018
Swinburne University of Technology
2017
Harvard University
2012
Harvard University Press
2010
Princeton University
2010
We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. detail improvements to PS1 SN photometry, astrometry calibration that reduce systematic uncertainties in distances. combine subset of 279 ($0.03 < z 0.68$) with useful distance estimates from SDSS, SNLS, various low-z HST samples form largest combined sample consisting a total 1048 ranging $0.01 2.3$, which we...
The Zwicky Transient Facility (ZTF) is a new optical time-domain survey that uses the Palomar 48 inch Schmidt telescope. A custom-built wide-field camera provides 47 deg2 field of view and 8 s readout time, yielding more than an order magnitude improvement in speed relative to its predecessor survey, Factory. We describe design implementation observing system. ZTF data system at Infrared Processing Analysis Center near-real-time reduction identify moving varying objects. outline analysis...
The Zwicky Transient Facility (ZTF), a public-private enterprise, is new time domain survey employing dedicated camera on the Palomar 48-inch Schmidt telescope with 47 deg$^2$ field of view and 8 second readout time. It well positioned in development astronomy, offering operations at 10% scale style Large Synoptic Survey Telescope (LSST) single 1-m class telescope. public surveys will cover observable northern sky every three nights g r filters visible Galactic plane night r. Alerts...
In the past decade, several rapidly evolving transients have been discovered whose timescales and luminosities are not easily explained by traditional supernovae (SNe) models. The sample size of these objects has remained small due, at least in part, to challenges detecting short timescale with survey cadences. Here we present results from a search within Pan-STARRS1 Medium Deep Survey (PS1-MDS) for luminous transients. We identify 10 new time above half-maximum (t1/2) less than 12 days...
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans redshift range 0.1 ≲ z 1.6, is first comprehensive galaxy study this specific subclass cosmic explosions. Combining multi-band emission-line measurements, we determine luminosities, stellar masses, star formation rates, metallicities. find that, as a whole, hosts SLSNe are...
We present griz light curves of 146 spectroscopically confirmed Type Ia Supernovae ($0.03 < z <0.65$) discovered during the first 1.5 years Pan-STARRS1 Medium Deep Survey. The natural photometric system is determined by a combination on-site measurements instrument response function and observations spectrophotometric standard stars. find that systematic uncertainties in are currently 1.2\% without accounting for uncertainty HST Calspec definition AB system. A Hubble diagram constructed with...
The double explosion of SN 2009ip in 2012 raises questions about our understanding the late stages massive star evolution. Here we present a comprehensive study during its remarkable rebrightenings. High-cadence photometric and spectroscopic observations from GeV to radio band obtained variety ground-based space facilities (including Very Large Array, Swift, Fermi, Hubble Space Telescope, XMM) constrain be low energy (E ∼ 1050 erg for an ejecta mass ∼0.5 M☉) asymmetric complex medium shaped...
We present ultraviolet through near-infrared photometry and spectroscopy of the host galaxies all superluminous supernovae (SLSNe) discovered by Palomar Transient Factory prior to 2013, derive measurements their luminosities, star-formation rates, stellar masses, gas-phase metallicities. find that Type I (hydrogen-poor) SLSNe are found almost exclusively in low-mass (M < 2x10^9 M_sun) metal-poor (12+log[O/H] 8.4) galaxies. compare mass metallicity distributions our sample nearby galaxy...
Abstract We present a comprehensive optical and near-infrared census of the fields 90 short gamma-ray bursts (GRBs) discovered in 2005–2021, constituting all GRBs for which host galaxy associations are feasible (≈60% total Swift GRB population). contribute 274 new multi-band imaging observations across 58 distinct 26 spectra their galaxies. Supplemented by literature archival survey data, catalog contains 542 photometric 42 spectroscopic data sets. The reaches 3 σ depths ≳24–27 mag ≳23–26...
Abstract We present a search for extragalactic fast blue optical transients (FBOTs) during Phase I of the Zwicky Transient Facility (ZTF). identify 38 candidates with durations above half-maximum light 1 day < t 1/2 12 days, which 28 have ( g − r ≲ −0.2 mag) colors at peak light. Of (28 FBOTs), 19 (13) can be spectroscopically classified as core-collapse supernovae (SNe): 11 (8) H- or He-rich (Type II/IIb/Ib) SNe, 6 (4) interacting IIn/Ibn) and 2 (1) H&He-poor Ic/Ic-BL) SNe. Two FBOTs...
We present the Pan-STARRS1 discovery of long-lived and blue transient PS1-11af, which was also detected by Galaxy Evolution Explorer with coordinated observations in near-ultraviolet (NUV) band. PS1-11af is associated nucleus an early type galaxy at redshift z = 0.4046 that exhibits no evidence for star formation or active galactic activity. Four epochs spectroscopy reveal a pair broad absorption features UV on otherwise featureless spectra. Despite superficial similarity these to P-Cygni...
We present radio, optical/NIR, and X-ray observations of the afterglow short-duration 130603B, uncover a break in radio optical bands at 0.5 d after burst, best explained as jet with an inferred opening angle 4-8 deg. GRB 130603B is only third short detection to date, first time that evident band. model temporal evolution spectral energy distribution determine burst explosion properties find isotropic-equivalent kinetic (0.6-1.7) x 10^51 erg circumburst density 5 10^-3-30 cm^-3. From we...
We present observations of SN 2015bn (= PS15ae = CSS141223-113342+004332 MLS150211-113342+004333), a Type I superluminous supernova (SLSN) at redshift $z=0.1136$. As well as being one the closest SLSNe yet discovered, it is intrinsically brighter ($M_U\approx-23.1$) and in fainter galaxy ($M_B\approx-16.0$) than other $z\sim0.1$. used this opportunity to collect most extensive dataset for any SLSN date, including densely-sampled spectroscopy photometry, from UV NIR, spanning $-$50 +250 days...
We report the discovery by intermediate Palomar Transient Factory (iPTF) of a candidate tidal disruption event (TDE) iPTF16axa at $z=0.108$, and present its broadband photometric spectroscopic evolution from 3 months follow-up observations with ground-based telescopes Swift. The light curve is well fitted $t^{-5/3}$ decay, we constrain rise-time to peak be $<$49 rest-frame days after disruption, which roughly consistent fallback timescale expected for $\sim 5\times$10$^{6}$ $M_\odot$ black...
In recent years, wide-field sky surveys providing deep multi-band imaging have presented a new path for indirectly characterizing the progenitor populations of core-collapse supernovae (SN): systematic light curve studies. We assemble set 76 grizy-band Type IIP SN curves from Pan-STARRS1, obtained over constant survey program 4 years and classified using both spectroscopy machine learning-based photometric techniques. develop apply Bayesian model full evolution each in sample. find no...
We probe the systematic uncertainties from 113 Type Ia supernovae (SNIa) in Pan-STARRS1 (PS1) sample along with 197 SN a combination of low-redshift surveys. The companion paper by Rest et al. (2013) describes photometric measurements and cosmological inferences PS1 sample. largest uncertainty stems calibration low-z samples. increase observed Calspec standards 7 to 10 used define system. SDSS-II systems are compared discrepancies up ~0.02 mag recovered. find proper way treat intrinsic...
The Zwicky Transient Facility is a large optical survey in multiple filters producing hundreds of thousands transient alerts per night. We describe here various machine learning (ML) implementations and plans to make the maximal use data set by taking advantage temporal nature data, further combining it with other sets. start initial steps separating bogus candidates from real ones, stars galaxies, go on classification objects into classes. Besides usual methods (e.g., based features...
We report the discovery of a multiply imaged, gravitationally lensed type Ia supernova, iPTF16geu (SN 2016geu), at redshift z = 0.409. This phenomenon was identified because light from stellar explosion magnified more than 50 times by curvature space around matter in an intervening galaxy. used high-spatial-resolution observations to resolve four images approximately 0.3 arc seconds center foreground The probe physical scale ~1 kiloparsec, smaller is typical other studies extragalactic...
We present observations of two new hydrogen-poor superluminous supernovae (SLSN-I), iPTF15esb and iPTF16bad, showing late-time H-alpha emission with line luminosities (1-3)e+41 erg/s velocity widths (4000-6000) km/s. Including the previously published iPTF13ehe, this makes up a total three such events to date. iPTF13ehe is one most luminous slowest evolving SLSNe-I, whereas other are less fast decliners. interpret as result ejecta running into neutral H-shell located at radius ~ 1.0e+16cm....
Explosive origin of a binary neutron star Some types core-collapse supernovae are known to produce (NS). A NS merger was recently detected from its gravitational wave emission, but it is unclear how such tight system can be formed. De et al. discovered supernova with unusual properties, including the removal outer layers before explosion. They interpret this as second in an interacting that already contains one NS. Because explosion probably produced (rather than black hole) orbit, could...
Abstract We present observations of SN 2021csp, the second example a newly identified type supernova (SN) hallmarked by strong, narrow, P Cygni carbon features at early times (Type Icn). The appears as fast and luminous blue transient times, reaching peak absolute magnitude −20 within 3 days due to strong interaction between ejecta ( v ≈ 30,000 km s −1 ) massive, dense, fast-moving C/O wind shed WC-like progenitor months before explosion. narrow-line disappear from spectrum 10–20 after...
We present analysis of the light curves (LCs) 77 hydrogen-poor superluminous supernovae (SLSNe-I) discovered during Zwicky Transient Facility Phase-I operation. find that majority (67\%) sample can be fit equally well by both magnetar and ejecta-circumstellar medium (CSM) interaction plus $^{56}$Ni decay models. This implies LCs alone not unambiguously constrain physical power sources for a SLSN-I. However, 23\% show inverted V-shape, steep declining or features long rise fast post-peak...
Abstract During the Zwicky Transient Facility (ZTF) Phase I operations, 78 hydrogen-poor superluminous supernovae (SLSNe-I) were discovered in less than 3 yr, constituting largest sample from a single survey. This paper (Paper I) presents data, including optical/UV light curves and classification spectra, while Paper II this series will focus on detailed analysis of modeling. Our photometry is primarily taken by ZTF g , r i bands, with additional data other ground-based facilities Swift. The...