A5009374040- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Astrophysics and Star Formation Studies
- Nuclear physics research studies
- Calibration and Measurement Techniques
- Geological and Geophysical Studies
- Radio Astronomy Observations and Technology
- Pacific and Southeast Asian Studies
- SAS software applications and methods
- History and Developments in Astronomy
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Autopsy Techniques and Outcomes
- Inorganic Fluorides and Related Compounds
Fundación Chile
2022-2024
Texas A&M University
2012-2024
University of Chile
2013-2022
Millennium Institute of Astrophysics
2014-2020
Las Campanas Observatory
2001-2017
Astronomical Observatory of Capodimonte
2016
Brera Astronomical Observatory
2016
Millennium Institute
2014-2015
Carnegie Institution for Science
2002-2012
Carnegie Observatories
2002-2012
The High-Z Supernova Search is an international collaboration to discover and monitor Type Ia supernovae (SNe Ia) at z > 0.2 with the aim of measuring cosmic deceleration global curvature. Our has pursued a basic understanding in nearby universe, discovering observing large sample objects developing methods measure accurate distances SNe Ia. This paper describes extension this program ≥ 0.2, outlining our search techniques follow-up program. We have devised high-throughput filters that...
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of exciting science opportunities next decade. The Large Synoptic Survey Telescope (LSST) have an effective aperture 6.7 meters and imaging camera field view 9.6 deg^2, be devoted ten-year 20,000 deg^2 south +15 deg. Each pointing imaged 2000 times fifteen second exposures six broad from 0.35 1.1 microns, total point-source depth r~27.5. LSST Science Book describes basic...
We develop a method for estimating the host galaxy dust extinction type Ia supernovae based on an observational coincidence first noted by Lira, who found that B-V evolution during period from 30 to 90 days after V maximum is remarkably similar all events, regardless of light-curve shape. This fact used calibrate dependence Bmax-Vmax and Vmax-Imax colors decline rate parameter Δm15(B), which can, in turn, be separately estimate extinction. Using these methods eliminate effects reddening, we...
We have coordinated Hubble Space Telescope (HST) photometry with ground-based discovery for three supernovae: Type Ia supernovae near z ≈ 0.5 (SN 1997ce, SN 1997cj) and a third event at = 0.97 1997ck). The superb spatial resolution of HST separates each supernova from its host galaxy leads to good precision in the light curves. use these curves relations between luminosity, light-curve shape, color calibrated low-z samples derive relative luminosity distances that are accurate 10% 20% 1....
We have obtained new observations of both secondary and tertiary spectrophotometric standards with the RC spectrographs CCD cameras on 1.5-m 4-m telescopes at CTIO in wavelength range 3300-7550 angstroms, as well UBV(RI)KC photometry for these stars. modified monochromatic fluxes published by Taylor (1984) according to calibration Vega provided Hayes (1985). also uned zero-point energy distribution stars matching their V synthetic magnitudes observed magnitudes. use adjusted order calculate...
We have obtained new observations of both secondary and tertiary spectrophotometric standards with the RC spectrographs CCD cameras on 1.5-m 4-m telescopes at CTIO in wavelength range 6000-10500 A. use order to calculate fluxes for Stone Baldwin (1983), as well three stars northern hemisphere from (1977). find that synthetic magnitudes calculated our spectra through IKC band agree extremely observed photometry, better than 1% average. For monochromatic fluxes, we an internal precision 0.01...
I use photometry and spectroscopy data for 24 Type II plateau supernovae (SNe IIP) to examine their observed physical properties. This set shows that these objects encompass a wide range of ~5 mag in luminosities, expansion velocities vary by factor 5, the nickel masses produced explosions go from 0.0016 0.26 M☉. From subset 16 find explosion energies between 0.6 × 1051 5.5 ergs, ejected 14-56 M☉, progenitors' radii 80 600 R☉. Despite this great diversity, several regularities emerge, which...
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...
The Carnegie Supernova Project (CSP) is a five-year survey being carried out at the Las Campanas Observatory to obtain high-quality light curves of ∼100 low-redshift Type Ia supernovae (SNe Ia) in well-defined photometric system. Here we present first release data that contains optical 35 SNe Ia, and near-infrared for subset 25 events. comprise 5559 (ugriBV) 1043 (Y JHKs) points natural system Swope telescope. Twenty-eight have pre-maximum data, 15 these, observations begin least 5 days...
We present an analysis of the diversity V-band light-curves hydrogen-rich type II supernovae. Analyzing a sample 116 supernovae, several magnitude measurements are defined, together with decline rates at different epochs, and time durations phases. It is found that magnitudes measured maximum light correlate more strongly than those other epochs: brighter supernovae generally have faster declining all epochs. find relation between rate during 'plateau' phase peak magnitudes, which has...
The Carnegie Supernova Project (CSP) was a five-year observational survey conducted at Las Campanas Observatory that obtained, among other things, high-quality light curves of ~100 low-redshift Type Ia supernovae (SNe Ia). Presented here is the second data release nearby SN photometry consisting 50 objects, with subset 45 having near-infrared follow-up observations. Thirty-three objects have optical pre-maximum coverage 15 beginning least 5 days before maximum light. In near-infrared, 27...
High-dispersion observations of the Na i D λλ5890, 5896 and K λλ7665, 7699 interstellar lines, diffuse band at 5780 Å in spectra 32 Type Ia supernovae are used as an independent means probing dust extinction. We show that extinction objects where is detected consistent with visual derived from supernova colors. This strongly suggests producing predominantly located medium host galaxies not circumstellar material associated progenitor system. One quarter display anomalously large column...
We report the results of a three-year-long dedicated monitoring campaign restless luminous blue variable (LBV) in NGC 7259. The object, named SN 2009ip, was observed photometrically and spectroscopically optical near-infrared domains. monitored number erupting episodes past few years, increased density our observations during eruptive episodes. In this paper, we present full historical data set from 2009 to 2012 with multi-wavelength dense coverage two high-luminosity events between August...
We present final natural system optical (ugriBV) and near-infrared (YJH) photometry of 134 supernovae (SNe) with probable white dwarf progenitors that were observed in 2004-2009 as part the first stage Carnegie Supernova Project (CSP-I). The sample consists 123 Type Ia SNe, 5 Iax 2 super-Chandrasekhar SN candidates, SNe interacting circumstellar matter, 2006bt-like events. redshifts objects range from z = 0.0037 to 0.0835; median redshift is 0.0241. For 120 (90%) these was obtained. Average...
We examine the absolute luminosities of 29 SNe Ia in Calan/Tololo survey. confirm a relation between peak luminosity and decline rate as measured by light curve, suggested Phillips (1993). derive linear slopes to this magnitude-decline BV(I)kc colors, using sample with Bmax-Vmax < 0.2 mag. The scatter around (and thus ability measure distances) ranges from 0.13 mag (in I band) 0.17 B band). also find evidence for significant correlations magnitudes or morphological type host galaxy.
We have constructed Hubble diagrams in B and V for 13 Type Ia supernovae (SNe Ia) found the course of Calan/Tololo survey covering an unprecedented range redshift (0.01< z <0.1). As opposed to other published diagrams, these are solely based on light curves obtained with CCDs, which been carefully reduced order avoid background contamination. Special care was also taken extrapolation peak magnitudes SNe that were discovered after maximum by using five different template representing observed...
We present 13 spectra and 31 photometric observations covering the first 150 days of SN 1991bg in NGC 4374 (M 84). Although was a type Ia supernova displaying characteristic Si II absorption at 6150 A near maximum Fe emission lines late phases, it varied from well-defined norm for SNe several important respects. The peculiarities include faster declines B V light curves after maximum, distinct color evolution, very red - relatively faint peak luminosity, spectral short phase. narrow...
We present UBVRIz lightcurves of the Type Ia SN 1999ee and Ib/c 1999ex, both located in galaxy IC 5179. has an extremely well sampled lightcurve spanning from 10 days before Bmax through 53 after peak. Near maximum we find systematic differences ~0.05 mag photometry measured with two different telescopes, even though is reduced to same local standards around supernova using specific color terms for each instrumental system. use models our bandpasses spectrophotometry derive magnitude...
Optical spectra of SN 1991T obtained approximately one week before B maximum showed no evidence the Si, Ca, and S absorption lines which normally dominate type Ia supernovae at early phases. Nevertheless, within two weeks after maximum, spectrum had evolved to resemble closely that other events. These observations suggest abundances in outer ejecta were unusually low. The V light curves resembled those supernovae, but slope initial decline following was less steep than normal both colors. In...
BVRI light curves are presented for 27 Type Ia supernovae discovered during the course of Calan/Tololo Survey and two other SNe observed same period. Estimates maximum magnitudes in B, V, I bands initial decline rate parameter m15(B) also given.
We present the analysis of first set low-redshift Type Ia supernovae (SNe Ia) by Carnegie Supernova Project. Well-sampled, high-precision optical (ugriBV) and near-infrared (NIR; YJHKs) light curves obtained in a well-understood photometric system are used to provide light-curve parameters, ugriBVYJH template curves. The intrinsic colors at maximum calibrated compute optical--NIR color excesses for full sample, thus allowing properties reddening law host galaxies be studied. A low value...
We present optical and infrared spectroscopy of the first 2 months evolution Type II supernova SN 1999em. combine these data with high-quality optical/infrared photometry beginning only 3 days after shock breakout, in order to study performance "expanding photosphere method" (EPM) determination distances. With this purpose, we develop a technique measure accurate photospheric velocities by cross-correlating observed model spectra. The application 1999em shows that can reach an average...