Saurabh W. Jha
A5018303472- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Nuclear reactor physics and engineering
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- Advanced Power Generation Technologies
- Solar and Space Plasma Dynamics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Nuclear Engineering Thermal-Hydraulics
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Geophysics and Gravity Measurements
- CCD and CMOS Imaging Sensors
- Spacecraft and Cryogenic Technologies
- Dark Matter and Cosmic Phenomena
Rutgers, The State University of New Jersey
2015-2024
KIIT University
2024
Centre for Artificial Intelligence and Robotics
2024
Indian Institute of Technology Mandi
2024
Hospital of the University of Pennsylvania
2024
Rutgers Sexual and Reproductive Health and Rights
2017-2023
Sharda University
2023
Flatiron Institute
2019-2020
Flatiron Health (United States)
2019-2020
Rütgers (Germany)
2017
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z 0.62. The luminosity distances these objects are determined by methods that employ relations between SN light curve shape. Combined with previous data from our High-z Supernova Search Team recent results Riess et al., this expanded set 16 high-redshift a 34 nearby used to place constraints on following cosmological parameters: Hubble constant (H0), mass density (ΩM), (i.e.,...
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to provide first conclusive evidence for cosmic deceleration that preceded current epoch of acceleration. These objects, during course GOODS ACS Treasury program, include 6 7 highest redshift SNe known, all at z > 1.25, populate diagram in unexplored territory. The luminosity distances these objects 170 previously reported been determined using empirical relations between light-curve shape...
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on Hubble Space Telescope, from mid-ultraviolet near-infrared, and find measure Type Ia supernovae at z>1.5 test their accuracy as standardizable candles for cosmology. Five premier multi-wavelength sky regions are selected, each with...
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to trace history of cosmic expansion over last 10 billion yr. These objects, which include 13 spectroscopically confirmed SNe at z ≥ 1, were during 14 epochs reimaging GOODS fields North South 2 yr Advanced Camera for Surveys on HST. Together a recalibration our previous HST-discovered Ia, full sample 23 1 provides highest redshift known. Combining these data SN sets, we measured H(z)...
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm result of Riess et al. (1998a) Perlmutter (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend range consistently SN Ia to z~1, where signature cosmological effects opposite sign some plausible systematic effects. Consequently, these measurements not only provide another quantitative...
We use the Wide Field Camera 3 (WFC3) on Hubble Space Telescope to determine constant (H0) from optical and infrared observations of over 600 Cepheid variables in host galaxies 8 recent Type Ia supernovae (SNe Ia), providing calibration for a mag-z relation 253 SNe Ia. Increased precision past measurements comes from: (1) more than doubling number Cepheids nearby SN hosts; (2) increasing sample ideal calibrators six eight; (3) by 20% with megamaser NGC 4258; (4) reducing difference mean...
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...
This paper describes the Hubble Space Telescope imaging data products and reduction procedures for Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). survey is designed to document evolution of galaxies black holes at $z\sim1.5-8$, study Type Ia SNe beyond $z>1.5$. Five premier multi-wavelength sky regions are selected, each with extensive multiwavelength observations. The primary CANDELS consist obtained in Wide Field Camera 3 / infrared channel (WFC3/IR) UVIS channel,...
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from ESSENCE supernova survey. derive a set of nature assuming flat Universe. By including (Omega_M, w) baryon acoustic oscillations, we obtain value for static parameter w=-1.05^{+0.13}_{-0.12} (stat; 1 sigma) +- 0.11 (sys) and Omega_M=0.274^{+0.033}_{-0.020} with best-fit chi^2/DoF 0.96. These results are consistent those reported by SuperNova Legacy Survey in similar...
We combine the CfA3 supernovae Type Ia (SN Ia) sample with samples from literature to calculate improved constraints on dark energy equation of state parameter, w. The is added Union set Kowalski et al. form Constitution and, combined a BAO prior, produces 1 + w = 0.013+0.066−0.068 (0.11 syst), consistent cosmological constant. addition makes cosmologically useful nearby SN between 2.6 and 2.9 times larger than before, reducing statistical uncertainty point where systematics play largest...
We present an updated version of the multicolor light-curve shape method to measure distances Type Ia supernovae (SNe Ia), incorporating new procedures for K-correction and extinction corrections. also develop a simple model disentangle intrinsic color variations reddening by dust expand incorporate U-band light curves more easily accommodate prior constraints on any parameters. apply this 133 nearby SNe Ia, including 95 objects in Hubble flow (cz ≥ 2500 km s-1), which give dispersion less...
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit multi-cycle treasury program to use the gravitational lensing properties of 25 galaxy clusters accurately constrain their mass distributions. survey, described in detail this paper, will definitively establish degree concentration dark matter cluster cores, key prediction CDM. CLASH sample larger and less biased than current samples space-based imaging studies similar depth, as we have minimized lensing-based...
We report observations of 240 Cepheid variables obtained with the Near Infrared Camera (NICMOS) through F160W filter on Hubble Space Telescope (HST). The Cepheids are distributed across six recent hosts Type Ia supernovae (SNe Ia) and "maser galaxy" NGC 4258, allowing us to directly calibrate peak luminosities SNe from precise, geometric distance measurements provided by masers. New features our measurement include use same instrument for all ladder homogeneity periods metallicities thus...
We use Type Ia supernovae studied by the High-z Supernova Search Team to constrain properties of an energy component that may have contributed accelerating cosmic expansion. find for a flat geometry equation-of-state parameter unknown component, αx = Px/ρx, must be less than -0.55 (95% confidence) any value Ωm, and it is further limited < -0.60 if Ωm assumed greater 0.1. These values are inconsistent with being topological defects such as domain walls, strings, or textures. The supernova...
This is the second paper of a series in which we present new measurements observed rates supernovae (SNe) local Universe, determined from Lick Observatory Supernova Search (LOSS). In this paper, complete SN sample constructed, and (uncorrected for host-galaxy extinction) luminosity functions (LFs) SNe are derived. These LFs solve two issues that have plagued previous rate calculations nearby SNe: distribution extinction. We select volume-limited 175 SNe, collect photometry every object fit...
We present 1210 Johnson/Cousins B, V, R, and I photometric observations of 22 recent Type Ia supernovae (SNe Ia): SNe 1993ac, 1993ae, 1994M, 1994S, 1994T, 1994Q, 1994ae, 1995D, 1995E, 1995al, 1995ac, 1995ak, 1995bd, 1996C, 1996X, 1996Z, 1996ab, 1996ai, 1996bk, 1996bl, 1996bo, 1996bv. Most the photometry was obtained at Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics in a cooperative observing plan aimed improving database Ia. The redshifts sample range from cz =...
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z 0.42, discovered during first season (Fall 2005) Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. These data fill in redshift "desert" between low- and high-redshift SN surveys. combine SDSS-II new distance estimates published from ESSENCE survey, Legacy Survey, Space Telescope, a compilation nearby measurements. Combining Baryon Acoustic Oscillations SDSS Luminous Red Galaxy sample...
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$_0=73.5\pm1.1$...
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey and coworkers) are extended to a wider range of models including dynamical dark energy nonstandard models. We fold in greater number external data sets such as recent Higher-z release high-redshift supernovae (Riess coworkers), well several complementary probes. Model comparison statistics Bayesian Akaike information criteria applied gauge worth These favor that give good fit with fewer parameters. Based on this...
We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains largest number homogeneously observed reduced nearby SNe Ia (z ≲ 0.08) published to date. It more than doubles sample, bringing SN cosmology point where systematic uncertainties dominate. Our natural system has a precision ≲0.02 mag in BVRIr'i' ≲0.04...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z 0.35) Type Ia supernovae (SNe Ia) using repeated five-band (ugriz) imaging over an area of 300 sq. deg. survey region is stripe 2.5° wide centered the celestial equator in Southern Galactic Cap that been imaged numerous times earlier years, enabling construction deep reference image discovery new objects. Supernova observations are being...
We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range z = 0.34-1.03, nine which are unambiguously classified as Type Ia. These SNe were discovered during the IfA Deep Survey, began in 2001 September observed total 2.5 deg2 to depth approximately m ≈ 25-26 RIZ over 9-17 visits, typically every 1-3 weeks for nearly 5 months, with additional continuing until 2002 April. give brief description survey motivations, observational strategy,...
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 describe observed properties of the Type Iax class supernovae (SNe Iax), consisting SNe observationally similar to its prototypical member, SN 2002cx. The currently has 25 members, and we present optical photometry and/or spectroscopy for most them. are spectroscopically Ia, but have lower maximum-light velocities (2000 ≲ |v| 8000 km s−1), typically peak magnitudes (−14.2 ⩾ MV, ≳ −18.9 mag), hot photospheres. Relative low luminosities their light-curve shape. There is a correlation...