Susana E. Deustua
A5049629462- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Infrared Target Detection Methodologies
- History and Developments in Astronomy
- Astrophysics and Star Formation Studies
- Photocathodes and Microchannel Plates
- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Sensor Technology and Measurement Systems
- Advanced Semiconductor Detectors and Materials
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
Space Telescope Science Institute
2014-2024
National Institute of Standards and Technology
2022-2024
Michigan Science Center
2019
American Journal Experts (United States)
2010
American Astronomical Society
2002-2008
Mental Health Commission
2008
Lawrence Berkeley National Laboratory
1996-2004
University of California, Berkeley
1997-2004
Stockholm University
2003
UNSW Sydney
1996
We report measurements of the mass density, ΩM, and cosmological-constant energy ΩΛ, universe based on analysis 42 type Ia supernovae discovered by Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 0.83, are fitted jointly with a set from Calán/Tololo Survey, below 0.1, to yield values cosmological parameters. All supernova peak magnitudes standardized using SN light-curve width-luminosity relation. measurement yields joint probability...
We present Advanced Camera for Surveys, NICMOS, and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey. The SNe were discovered over redshift interval 0.623 < z 1.415. Of these Ia, 14 pass our strict selection cuts are used in combination with world's sample to derive best current constraints on dark energy. new 10 beyond = 1, thereby nearly doubling statistical weight HST-discovered this redshift. Our...
We report measurements of ΩM, ΩΛ, and w from 11 supernovae (SNe) at z = 0.36-0.86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set high-redshift SNe that confirms previous SN evidence for accelerating universe. The available photometry make it possible these alone to provide cosmological parameters comparable in statistical weight results. Combined earlier Supernova Cosmology Project data, new yield a measurement mass density...
We present a new compilation of Type Ia supernovae (SNe Ia), dataset low-redshift nearby-Hubble-flow SNe and analysis procedures to work with these heterogeneous compilations. This ``Union'' 414 SN Ia, which reduces 307 after selection cuts, includes the recent large samples from Supernova Legacy Survey ESSENCE Survey, older datasets, as well recently extended distant observed HST. A single, consistent blind procedure is used for all various subsamples, implemented that consistently weights...
We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including signal-to-noise Hubble Space Telescope data, and spectra six SNe that were discovered during 2001, are presented. Additionally, for two with z > 1, we present ground-based J-band photometry from Gemini Very Large Telescope. These among most distant which near-IR observations have been obtained. add these together other data sets recently become available in...
The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with unique combination of high angular resolution ($\approx$2.5"), sensitivity (a 1$\sigma$ goal 70 $\mu$Jy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2-4 GHz). first observations began September 2017, observing for will finish 2024. VLASS use approximately 5500 hours on Karl G. Jansky (VLA) to cover whole visible VLA (Declination $>-40^{\circ}$), total...
Roth et al (2014a) reported evidence for plumes of water venting from a southern high latitude region on Europa - spectroscopic detection off-limb line emission the dissociation products water. Here, we present Hubble Space Telescope (HST) direct images in far ultraviolet (FUV) as it transited smooth face Jupiter, order to measure absorption gas or aerosols beyond limb. Out ten observations found three which plume activity could be implicated. Two show statistically significant features at...
Abstract It is critical for James Webb Space Telescope (JWST) science that instrumental units are converted to physical units. We detail the design of JWST absolute flux calibration program has core goal ensuring a robust internal and between all instruments both point extended source science. This will observe sample stars have been extensively vetted based mainly on Hubble Telescope, Spitzer Transiting Exoplanet Survey Satellite observations. The uses multiple three different,...
R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter time-axis width factor w ≡ s(1 + z). The data points then individually aligned time axis, normalized, and K-corrected back rest frame, after which nearly 1300 normalized found lie on well-determined common rest-frame B-band curve, we call "composite curve." same procedure is applied 18 low-redshift...
Abstract Evidence for plumes of water on Europa has previously been found using the Hubble Space Telescope two different observing techniques. Roth et al. line emission from dissociation products water. Sparks evidence off-limb continuum absorption as transited Jupiter. Here, we present a new transit observation that shows second event at same location previous plume candidate al., raising possibility consistently active source erupting material Europa. This conclusion is bolstered by...
We report results from a multiwavelength observing campaign conducted during 2000 March on the flare star AD Leo. Simultaneous data were obtained several ground- and space-based observatories, including observations of eight sizable flares. discuss correlation line continuum emission in optical ultraviolet wavelength regimes, as well energy budget, we find that properties are remarkably similar even for flares very different evolutionary morphology. This suggests common heating mechanism...
view Abstract Citations (142) References (74) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Simultaneous Extreme-Ultraviolet Explorer and Optical Observations of AD Leonis: Evidence for Large Coronal Loops the Neupert Effect in Stellar Flares Hawley, Suzanne L. ; Fisher, George H. Simon, Theodore Cully, Scott Deustua, Susana E. Jablonski, Marek Johns-Krull, Christopher M. Pettersen, Bjorn R. Smith, Verne Spiesman, William J. Valenti, Jeffrey We report on...
While recent supernova cosmology research has benefited from improved measurements, current analysis approaches are not statistically optimal and will prove insufficient for future surveys. This paper discusses the limitations of cosmological analyses in treating outliers, selection effects, shape- color-standardization relations, unexplained dispersion, heterogeneous observations. We present a new Bayesian framework, called UNITY (Unified Nonlinear Inference Type-Ia cosmologY), that...
We present new results on the Hubble diagram of distant type Ia supernovae (SNe Ia) segregated according to host galaxy. This makes it possible check earlier evidence for a cosmological constant by explicitly comparing SNe residing in galaxies likely contain negligible dust with larger sample. The parameters derived from these hosted presumed dust-free early-type support claims constant, which we demonstrate at ≃5σ significance, and internal extinction implied is small even late-type systems...
We present an extensive new time-series of spectroscopic data the peculiar SN 1999aa in NGC 2595. Our set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing unusually complete time history. The early resemble those a 1991T-like object but relatively strong Ca H&K absorption feature. first clear sign Si II 6355, characteristic Type Ia supernovae, is found at day -7 its velocity remains constant up least month after light. transition...
We present a measurement of the rate distant Type Ia supernovae derived using four large subsets data from Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12 deg2, 38 were detected at redshifts 0.25-0.85. In spatially flat cosmological model consistent with results obtained by Project, we derive rest-frame supernova mean redshift z ≃ 0.55 1.53 × 10-4 h3 Mpc-3 yr-1 or 0.58 h2 SNu (1 = 1 per century 1010 LB☉), where first uncertainty is statistical and second...
The Gaia Data Release 1 (DR1) sample of white dwarf parallaxes is presented, including 6 directly observed degenerates and 46 dwarfs in wide binaries. This data set combined with spectroscopic atmospheric parameters to study the mass-radius relationship (MRR). G magnitudes are used derive model atmosphere dependent radii, which can then be compared predictions a theoretical MRR. We find good agreement between DR1 parallaxes, published effective temperatures (Teff) surface gravities (log g),...
How do galaxies transform from blue, star-forming spirals to red, quiescent early-type galaxies? To answer this question, we analyzed a set of 26 gas-rich, shocked post-starburst with Hubble Space Telescope (HST) imaging in B, I, and H bands, Sloan Digital Sky Survey (SDSS) i-band similar depth but lower resolution. We found that post-starbursts our sample have intermediate morphologies between disk- bulge-dominated (S\'ersic n$=1.7^{+0.3}_{-0.0}$) red bulges, likely due dust obscuration the...
We present the first measurement of rate Type Ia supernovae at high redshift. The result is derived by using a large subset data from Supernova Cosmology Project. Three were discovered in surveyed area 1.7 deg2. survey spanned ~3 week baseline and used images with 3 σ limiting magnitudes R ~ 23. our methods for estimating numbers galaxies number solar luminosities to which sensitive, as well supernova detection efficiency, determine control time, effective time sensitive event. derive...
We present new high spatial resolution Karl G. Jansky Very Large Array (VLA) HI absorption and Long Baseline (VLBA) continuum observations of the Active Galactic Nucleus (AGN)-driven molecular outflow candidate NGC 1266. Although other well-known systems with outflows may be driven by star formation in a central disk, mass rate reported Alatalo et al. (2011) 1266 13 M$_{\odot}$ year$^{-1}$ exceeds estimates from variety tracers. This suggests that an additional energy source, such as AGN,...
We report the discovery of a redshift 1.71 supernova in GOODS North field. The Hubble Space Telescope (HST) ACS spectrum has almost negligible contamination from host or neighboring galaxies. Although rest frame sampled range is too blue to include any Si ii line, principal component analysis allows us confirm it as Type Ia with 92% confidence. A recent serendipitous archival HST WFC3 grism contributed key element confirmation by giving host-galaxy 1.713 +/- 0.007. In addition being most...
We present VLA radio observations and optical imaging spectroscopy of 0218+357, which has been suggested to be the smallest known Einstein ring by Patnaik et al. (1991), preprint. The spectrum is rather red (F_v_ proportional V<SUP>alpha</SUP>^~-3.5) shows no strong features. have a tentative detection 4000 A break G band give redshift z = 0.68. identification m_r_~20 resolved galaxy, with an absolute magnitude M_R_~-23.8 or M_B_~ -22.0 consistent galaxy host being brightest cluster member....
We develop a method to measure the strength of absorption features in type Ia supernova (SN Ia) spectra and use it make quantitative comparisons between supernovae at low high redshifts. In this case study, we apply 12 high-redshift (0.212 ≤ z 0.912) SNe observed by Supernova Cosmology Project. Through measurements strengths these blueshift minimum Ca ii H&K, show that are quantitatively similar nearby (z < 0.15). One our redshift sample, SN 2002fd = 0.279, is found have spectral...