E. Y. Hsiao
A5085123408- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Neutrino Physics Research
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Geological and Geophysical Studies
- Solar and Space Plasma Dynamics
- Crystal Structures and Properties
- Particle accelerators and beam dynamics
- Solid-state spectroscopy and crystallography
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Superconducting Materials and Applications
- Adaptive optics and wavefront sensing
- Geophysics and Sensor Technology
- Medical Imaging Techniques and Applications
Taipei Medical University
2025
Florida State University
2015-2024
Las Campanas Observatory
2012-2022
Aarhus University
2014-2020
Lite-On Technology Corporation (Taiwan)
2019
Carnegie Institution for Science
2012-2014
Carnegie Observatories
2012-2014
Lawrence Berkeley National Laboratory
2010-2013
Taiwan Semiconductor Manufacturing Company (Taiwan)
2013
Carnegie Mellon University
2012
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...
After the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered a significant brightening of inner region NGC 2617, we began ~70 day photometric and spectroscopic monitoring campaign from X-ray through near-infrared (NIR) wavelengths. We report that 2617 went dramatic outburst, during which its flux increased by over an order magnitude followed increase optical/ultraviolet (UV) continuum almost magnitude. classified as Seyfert 1.8 galaxy in 2003, is now 1 due to appearance broad...
We combine high redshift Type Ia supernovae from the first 3 years of Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample 472 SNe (123 low-$z$, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}). SN data alone require cosmic acceleration >99.9% confidence, including systematic effects. For dark energy equation state parameter (assumed constant out least $z=1.4$) in flat universe, we find $w =...
We present photometric properties and distance measurements of 252 high redshift Type Ia supernovae (0.15 < z 1.1) discovered during the first three years Supernova Legacy Survey (SNLS). These events were detected their multi-colour light curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands. Follow-up spectroscopy was performed VLT, Gemini Keck telescopes to confirm nature measure redshifts....
We present observational constraints on the nature of dark energy using Supernova Legacy Survey three-year sample (SNLS3) Guy et al. and Conley use 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN luminosity host galaxy properties, include effects all identified systematic uncertainties directly cosmological fits. Combining SNLS3 data with full WMAP7 power spectrum, Sloan Digital Sky luminous red a prior Hubble constant H0 from SHOES,...
(Abridged) Precision cosmology with Type Ia supernovae (SNe Ia) makes use of the fact that SN luminosities depend on their light-curve shapes and colours. Using Supernova Legacy Survey (SNLS) other data, we show there is an additional dependence global characteristics host galaxies: events same shape colour are, average, 0.08mag (~4.0sigma) brighter in massive galaxies (presumably metal-rich) low specific star-formation rates (sSFR). SNe a sSFR also have smaller slope ("beta") between...
With the advent of large dedicated Type Ia supernova (SN Ia) surveys, K-corrections SNe and their uncertainties have become especially important in determination cosmological parameters. While are largely driven by SN broad-band colors, it is shown here that diversity spectral features can also be important. For an individual observation, statistical errors from inhomogeneity range 0.01 (where observed rest-frame filters aligned) to 0.04 misaligned). To minimize systematic caused assumed...
Stellar Explosions Stars that are born with masses greater than eight times of the Sun end their lives in luminous explosions known as supernovae. Over past decade, access to improved sky surveys has revealed rare types supernovae much more any those were before. Gal-Yam (p. 927 ) reviews these superluminous events and groups them into three classes share common observational physical characteristics. Gamma-ray bursts another type extreme explosive related death massive stars, which occur...
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...
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...
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 an updated analysis of the intrinsic colors Type Ia supernova (SNe Ia) using latest data release Carnegie Supernova Project. introduce a new light-curve parameter very similar to stretch that is better suited for fast-declining events, and find these peculiar types can be seen as extensions population "normal" SNe Ia. With larger number objects, fit Lira relation presented along with evidence dependence on late-time slope B − V light-curves color. Using full wavelength range from...
The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. We describe the data reduction strategy and products which are publicly available through ESO archive Data Release 1 (SSDR1). PESSTO uses New Technology Telescope with EFOSC2 SOFI to provide optical NIR spectroscopy imaging. target supernovae transients brighter than 20.5mag for classification. Science targets then selected follow-up based on...
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 present SiFTO, a new empirical method for modeling Type Ia supernova (SN Ia) light curves by manipulating spectral template. make use of high-redshift SN data when training the model, allowing us to extend it bluer than rest-frame U. This increases utility our observations more available data. find that shape curve is described using stretch prescription, applying same at all wavelengths not an adequate description. SiFTO therefore uses generalization which applies different factors as...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
We present 32 epochs of optical (3300-9700 \AA) spectrophotometric observations the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in galaxy M101, extending from -15 to +97 d with respect B-band maximum, obtained by Nearby Supernova Factory collaboration. is closest (\mu = 29.04) and brightest (Bmax 9.94 mag) observed since advent modern large scale programs for intensive periodic followup supernovae. Both synthetic light curve measurements spectral feature analysis...
In the Spring of 2011 we carried out a 2.5 month reverberation mapping campaign using 3 m Shane telescope at Lick Observatory, monitoring 15 low-redshift Seyfert 1 galaxies. This paper describes observations, reductions and measurements, data products from spectroscopic campaign. The reduced spectra were fitted with multicomponent model in order to isolate contributions various continuum emission-line components. We present light curves broad emission lines active galactic nucleus (AGN)...
We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and properties of their host galaxies using a sample 115 SNe from Nearby Supernova Factory. use galaxy stellar masses specific star formation rates fitted photometry for all hosts, as well gas-phase metallicities subset 69 star-forming (non-active galactic nucleus) to show that SN correlate with each these properties. With data we find new evidence correlation intrinsic color metallicity. When combine our those...
Stripped-envelope (SE) supernovae (SNe) include H-poor (Type IIb), H-free Ib), and He-free Ic) events thought to be associated with the deaths of massive stars. The exact nature their progenitors is a matter debate several lines evidence pointing towards intermediate mass ( M init < 20 ⊙ ) stars in binary systems, while other cases they may linked single Wolf-Rayet Here we present analysis light curves 34 SE SNe published by Carnegie Supernova Project (CSP-I) that are unparalleled terms...
We present the discovery, photometric and spectroscopic follow-up observations of SN 2010X (PTF 10bhp).This supernova decays exponentially with τ d = 5 days, rivals current recordholder in speed, 2002bj.SN peaks at M r -17 mag has mean velocities 10,000 km s -1 .Our light curve modeling suggests a radioactivity powered event an ejecta mass 0.16 ⊙ .If by Nickel, we show that Nickel must be very small (≈0.02 ) quickly becomes optically thin to γ-rays.Our spectral 2002bj have similar chemical...
We present very early, high-cadence photometric observations of the nearby Type Ia SN 2017cbv. The light curve is unique in that it has a blue bump during first five days U, B, and g bands, which clearly resolved given our cadence 5.7 hr time span. model as combination early shocking supernova ejecta against nondegenerate companion star plus standard component. Our best-fit suggests presence subgiant 56 solar radii from exploding white dwarf, although this number highly model-dependent....
This is the first release of optical spectroscopic data low-redshift Type Ia supernovae (SNe Ia) by Carnegie Supernova Project including 604 previously unpublished spectra 93 SNe Ia. The observations cover a range phases from 12 days before to over 150 after time B-band maximum light. With addition 228 near-maximum literature, we study diversity among in quantitative manner. For that purpose, parameters are employed such as expansion velocities spectral line blueshifts and pseudo-equivalent...
SN 2014J in M82 is the closest detected Type Ia supernova (SN Ia) at least 28 years and perhaps 410 years. Despite its small distance of 3.3 Mpc, surprisingly faint, peaking V = 10.6 mag, assuming a typical luminosity, we infer an observed visual extinction A_V 2.0 +/- 0.1 mag. But this picture, with R_V 1.6 0.2, too simple to account for all observations. We combine 10 epochs (spanning month) HST/STIS ultraviolet through near-infrared spectroscopy HST/WFC3, KAIT, FanCam photometry from...