Benjamin E. Stahl
A5065188041- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Optical Systems and Laser Technology
- Astro and Planetary Science
- Speech and Audio Processing
- Integrated Circuits and Semiconductor Failure Analysis
- Cosmology and Gravitation Theories
- Atomic and Molecular Physics
- Hearing Loss and Rehabilitation
- Methane Hydrates and Related Phenomena
- Plasma Diagnostics and Applications
- Non-Destructive Testing Techniques
- Cardiac Imaging and Diagnostics
- Particle accelerators and beam dynamics
- Advanced Adaptive Filtering Techniques
- Speech Recognition and Synthesis
- Mitochondrial Function and Pathology
University of Music and Performing Arts Graz
2021-2025
University of California, Berkeley
2017-2023
Marin Endocrine Care and Research
2022
Fraunhofer Institute for Systems and Innovation Research
2018
We report observations from HST of Cepheids in the hosts 42 SNe Ia used to calibrate Hubble constant (H0). These include all suitable last 40 years at z<0.01, measured with >1000 orbits, more than doubling sample whose size limits precision H0. The are calibrated geometrically Gaia EDR3 parallaxes, masers N4258 (here tripling that Cepheid sample), and DEBs LMC. were same WFC3 instrument filters (F555W, F814W, F160W) negate zeropoint errors. present multiple verifications photometry tests...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$\Lambda$CDM model, we find $\Omega_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$...
Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part the Pantheon+ SN analysis and SH0ES (Supernovae H0 for Equation State dark energy) distance-ladder analysis. This effort is one a series works perform an extensive review redshifts, peculiar velocities, photometric calibration, intrinsic-scatter models SNe Ia. The total number curves, which are compiled across 18 different surveys,...
We report observations from HST of Cepheids in the hosts 42 SNe Ia used to calibrate Hubble constant (H0). These include all suitable last 40 years at z<0.01, measured with >1000 orbits, more than doubling sample whose size limits precision H0. The are calibrated geometrically Gaia EDR3 parallaxes, masers N4258 (here tripling that Cepheid sample), and DEBs LMC. were same WFC3 instrument filters (F555W, F814W, F160W) negate zeropoint errors. present multiple verifications photometry...
With Cosmicflows-4, distances are compiled for 55,877 galaxies gathered into 38,065 groups. Eight methodologies employed, with the largest numbers coming from correlations between photometric and kinematic properties of spiral (TF) elliptical (FP). Supernovae that arise degenerate progenitors (type Ia Sne) an important overlapping component. Smaller contributions come distance estimates surface brightness fluctuations luminosities expansion rates core collapse supernovae (SNII). Cepheid...
Abstract Recent studies suggest spectroscopic differences explain a fraction of the variation in Type Ia supernova (SN Ia) luminosities after light-curve/color standardization. In this work, (i) we empirically characterize variations standardized SN luminosities, and (ii) use spectroscopically inferred parameter, SIP, to improve precision SNe along distance ladder determination Hubble constant ( H 0 ). First, show that Pantheon+ covariance model modestly overestimates uncertainty magnitudes...
Progressive increases in the precision of Hubble-constant measurement via Cepheid-calibrated Type Ia supernovae (SNe Ia) have shown a discrepancy $\sim 4.4\sigma$ with current value inferred from Planck satellite measurements cosmic microwave background radiation and standard $\Lambda$CDM cosmological model. This disagreement does not appear to be due known systematic errors may therefore hinting at new fundamental physics. Although all techniques their own merits, further improvement...
We carried out spectroscopic monitoring of 21 low-redshift Seyfert 1 galaxies using the Kast double spectrograph on 3-m Shane telescope at Lick Observatory from April 2016 to May 2017. Targeting active galactic nuclei (AGN) with luminosities {\lambda}L{\lambda} (5100 {\AA}) = 10^44 erg/s and predicted H{\beta} lags 20-30 days or black hole masses 10^7-10^8.5 Msun, our campaign probes luminosity-dependent trends in broad-line region (BLR) structure dynamics as well improve calibrations for...
ABSTRACT The most stringent local measurement of the Hubble–Lemaître constant from Cepheid-calibrated Type Ia supernovae (SNe Ia) differs value inferred via cosmic microwave background radiation (Planck+ΛCDM) by ∼5σ. This so-called Hubble tension has been confirmed other independent methods, and thus does not appear to be a possible consequence systematic errors. Here, we continue upon our prior work using II provide another, largely method measure constant. From 13 SNe with geometric,...
We present BVRI and unfiltered light curves of 93 Type Ia supernovae (SNe Ia) from the Lick Observatory Supernova Search (LOSS) follow-up program conducted between 2005 2018. Our sample consists 78 spectroscopically normal SNe Ia, with remainder divided distinct subclasses (three SN 1991bg-like, three 1991T-like, four Iax, two peculiar, super-Chandrasekhar events), has a median redshift 0.0192. The in our have coverage 16 photometric epochs at cadence 5.4 days, first observed epoch is ~4.6...
In this work, BV RI light curves of 55 Type II supernovae (SNe II) from the Lick Observatory Supernova Search program obtained with Katzman Automatic Imaging Telescope and 1 m Nickel telescope 2006 to 2018 are presented. Additionally, more than 150 spectra gathered 3 Shane published. We conduct an analyse peak absolute magnitudes, decline rates, time durations different phases colour curves. Typically, our sampled a median cadence 5.5 days for total 5093 photometric points. average V-band...
We have modeled the velocity-resolved reverberation response of H\b{eta} broad emission line in nine Seyfert 1 galaxies from Lick Active Galactic Nucleus (AGN) Monitioring Project 2016 sample, drawing inferences on geometry and structure low-ionization broad-line region (BLR) mass central supermassive black hole. Overall, we find that BLR is generally a thick disk viewed at low to moderate inclination angles. combine our sample with prior studies investigate line-profile shape dependence,...
In this paper, we investigate distillation and pruning methods to reduce model size for non-intrusive speech quality assessment based on self-supervised representations. Our experiments build XLS-R-SQA, a using wav2vec 2.0 XLS-R embeddings. We retrain large compilation of mean opinion score datasets, encompassing over 100,000 labeled clips. For distillation, as teacher, generate pseudo-labels unlabeled degraded signals train student models varying sizes. pruning, use data-driven strategy....
We present 637 low-redshift optical spectra collected by the Berkeley Supernova Ia Program (BSNIP) between 2009 and 2018, almost entirely with Kast double spectrograph on Shane 3~m telescope at Lick Observatory. describe our automated spectral classification scheme arrive a final set of 626 (of 242 objects) that are unambiguously classified as belonging to Type supernovae (SNe~Ia). Of these, 70 30 objects spectroscopically peculiar (i.e., not matching signatures "normal" SNe~Ia) 79 SNe~Ia...
Abstract We present optical follow-up imaging obtained with the Katzman Automatic Imaging Telescope, Las Cumbres Observatory Global Telescope Network, Nickel Swope and Thacher of LIGO/Virgo gravitational wave (GW) signal from neutron star–black hole (NSBH) merger GW190814. searched GW190814 localization region (19 deg 2 for 90th percentile best localization), covering a total 51 94.6% two-dimensional region. Analyzing properties 189 transients that we consider as candidate counterparts to...
ABSTRACT We present the Democratic Samples of Supernovae (DSS), a compilation 775 low-redshift Type Ia and II supernovae (SNe II), which 137 SN distances are derived via newly developed snapshot distance method. Using objects in DSS as tracers peculiar-velocity field, we compare against corresponding reconstruction from 2M++ galaxy redshift survey. Our analysis – takes special care to properly weight each subcatalogue cross-calibrate relative scales between them results measurement...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$Λ$CDM model, we find $Ω_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$ km...
Abstract The Ground Wide Angle Camera Network (GWAC-N) is a network of robotic multi-aperture, multiple field-of-view (FoV) optical telescopes. main contingent GWAC-N instruments are provided by the Cameras Array (GWAC-A), and additional, narrower FoV telescopes utilized to provide fast multi-band follow-up capabilities. primary scientific goal search for counterparts gamma-ray bursts that will be detected Space Variable Object Monitor (SVOM) satellite. performs many additional observing...
The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift $z=0.004523$) was discovered by the Lick Observatory Supernova Search 4.9 days after fitted first-light time (FFLT; 11.1 before $B$-band maximum). Our first detection (pre-discovery) is merely $0.6\pm0.5$ day FFLT, making SN one of earliest known detections a Ia. A spectrum taken only 3.7 hr discovery (5.0 FFLT) and classified as normal We performed high-quality photometry, low- high-resolution spectroscopy, spectropolarimetry,...
We present BVRI and unfiltered Clear light curves of 70 stripped-envelope supernovae (SESNe), observed between 2003 2020, from the Lick Observatory Supernova Search (LOSS) follow-up program. Our SESN sample consists 19 spectroscopically normal SNe~Ib, two peculiar SNe Ib, six SN Ibn, 14 Ic, one ten Ic-BL, 15 IIb, ambiguous IIb/Ib/c, superluminous SNe. photometry has (on a per-SN basis) mean coverage 81 photometric points (median 58 points) cadence 3.6d 1.2d). From our full sample, subset 38...
We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN) 2016esw in CGCG~229-009 from first day after explosion up to 120 days. Its light-curve shape is similar that a typical SN II; however, near high-luminosity end distribution, with peak $M^{\rm max}_{V}=-18.36$ mag. The $V$-band light curve exhibits long recombination phase for (similar long-lived plateau 2004et). Considering well-known relation between luminosity decline rate, should...
We present {\tt deepSIP} (deep learning of Supernova Ia Parameters), a software package for measuring the phase and -- first time using deep light-curve shape Type supernova (SN~Ia) from an optical spectrum. At its core, consists three convolutional neural networks trained on substantial fraction all publicly-available low-redshift SN~Ia spectra, onto which we have carefully coupled photometrically-derived quantities. describe accumulation our spectroscopic photometric datasets, cuts taken...
This paper presents results of a listening experiment evaluating three-degrees-of-freedom binaural reproduction head-mounted microphone array signals. The methods are applied to an five microphones whose signals were simulated for static and dynamic orientations. Methods under test involve scene-agnostic as well that have knowledge (a subset of) source directions. instrumental evaluation reveal errors in the interaural level time differences all methods, which smallest end-to-end...
Abstract We present extensive optical photometric and spectroscopic observations of the high-velocity (HV) Type Ia supernova (SN Ia) 2017fgc, covering phase from ∼12 days before to ∼389 after maximum brightness. SN 2017fgc is similar normal SNe Ia, with an absolute peak magnitude <?CDATA ${M}_{\max }^{B}\approx $?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>max</mml:mi> <mml:mi>B</mml:mi>...