A5100389208- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Wastewater Treatment and Nitrogen Removal
- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Pulsars and Gravitational Waves Research
- Metamaterials and Metasurfaces Applications
- Astronomy and Astrophysical Research
- Catalytic Processes in Materials Science
- Astrophysics and Cosmic Phenomena
- Constructed Wetlands for Wastewater Treatment
- Advanced Wireless Communication Techniques
- Water Treatment and Disinfection
- Wireless Communication Networks Research
- Tracheal and airway disorders
- Heat transfer and supercritical fluids
- Advanced MIMO Systems Optimization
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Advanced Optimization Algorithms Research
- Building Energy and Comfort Optimization
- Sparse and Compressive Sensing Techniques
- Energy, Environment, Economic Growth
- Advanced Antenna and Metasurface Technologies
Xi'an Jiaotong University
2014-2025
Dalian University of Technology
2017-2024
Peking University
2024
Beijing University of Technology
2020-2024
Shanxi Datong University
2020-2024
Harbin Engineering University
2023-2024
Fudan University
2024
China University of Mining and Technology
2024
Nanjing University of Science and Technology
2023-2024
Xinjiang University
2024
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 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...
We study the observables of 158 relatively normal Type Ia supernovae (SNe Ia) by dividing them into two groups in terms expansion velocity inferred from absorption minimum Si ii λ6355 line their spectra near B-band maximum brightness. One group ("Normal") consists SNe populating a narrow strip distribution, with an average 〈v〉 = 10, 600 ± 400 km s−1 B maximum; other ("HV") objects higher velocities, v ≳ 11, 800 s−1. Compared Normal group, HV one shows narrower distribution both peak...
The results of a worldwide coordinated observational campaign on the broad-lined Type Ic supernova (SN Ic) 2003jd are presented. In total, 74 photometric data points and 26 spectra were collected using 11 different telescopes. SN is one most luminous ever observed. A comparison with other supernovae (SNe confirms that represents an intermediate case between broad-line events (2002ap, 2006aj) highly energetic SNe (1997ef, 1998bw, 2003dh, 2003lw), ejected mass Mej= 3.0 ± 1 M⊙ kinetic energy...
The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to nearly immediate relay position by Swift, we began imaging field 8 minutes after burst and continued for following days. No convincing optical/infrared candidate afterglow or supernova found object. We present re-analysis XRT find an absolute that is ~4" west reported previously. Close this bright elliptical galaxy with redshift z=0.2248, about 1' from center rich cluster galaxies. Based on...
We present extensive optical and infrared photometry of the afterglow gamma-ray burst (GRB) 030329 its associated supernova (SN) 2003dh over first two months after detection (2003 March 30-May 29 UT). Optical spectroscopy from a variety telescopes is shown and, when combined with photometry, allows an unambiguous separation between SN contributions. The GRB initially power-law continuum but shows significant color variations during week that are unrelated to presence SN. early light curve...
We report on observations of GRB 080503, a short gamma-ray burst (GRB) with very bright extended emission (about 30 times the fluence initial spike) in conjunction thorough comparison to other Swift events. In spite prompt-emission brightness, however, optical counterpart is extraordinarily faint, never exceeding 25 mag deep starting at ∼1 hr after Burst Alert Telescope (BAT) trigger. The brightness peaks day and then falls sharply manner similar predictions Li & Paczyński (1998) for...
We report on strong H2 and CO absorption from gas within the host galaxy of gamma-ray burst (GRB) 080607. Analysis our Keck/LRIS afterglow spectrum reveals a very large HI column density (NHI = 10^22.70 cm^-2) metal-line at z_GRB 3.0363 with roughly solar metallicity. detect series A-X bandheads estimate N(CO) 10^16.5 cm^-2 T_ex^CO > 100K. argue that high excitation temperature results UV pumping by GRB afterglow. Similarly, we observe via Lyman-Werner bands N(H2) 10^21.2 T_ex^H2...
We present extensive photometry at ultraviolet (UV), optical, and near-infrared (NIR) wavelengths, as well dense sampling of optical spectra, for the normal type Ia supernova (SN Ia) 2005cf. From well-sampled light curves, we find that SN 2005cf reached a B-band maximum 13.63+/-0.02 mag, with an observed luminosity decline rate dm_15(B) = 1.05+/-0.03 mag. The correlations between various color indexes, recalibrated on basis expanded sample, yielded E(B-V)_host=0.09+/-0.03 mag SN2005cf. UV...
Supernova (SN) 2009ig was discovered 17 hours after explosion by the Lick Observatory Search, promptly classified as a normal Type Ia SN (SN Ia), peaked at V = 13.5 mag, and equatorial, making it one of foremost supernovae for intensive study in last decade. Here, we present ultraviolet (UV) optical observations 2009ig, starting about 1 day until around maximum brightness. Our data include excellent UV light curves, 25 premaximum spectra, 8 including earliest spectrum ever obtained Ia. is...
What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention – both theoretically, in order to understand what happens stars the ∼15–25 M⊙ range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from regular hydrogen-rich SNe II-P characterized by a marked plateau their light curve. Here, we analyse multiband curves extensive spectroscopic coverage of...
Abstract In this work, a 3D printed double‐network (DN) hydrogel scaffold is designed with chitosan (CS) and polyvinyl alcohol (PVA) as the framework matrix. The addition of PVA into CS‐based clearly enhances mechanical properties lowers swelling behaviors hydrogels. crosslinking CS genipin can perform pre‐crosslinking to improve viscosity printability precursor, while increasing content results in lowering pre‐crosslinked hydrogel. antibacterial property DN display that have favorable...
We present the final installment of an intensive 13 year study variations optical continuum and broad Hβ emission line in Seyfert 1 galaxy NGC 5548. The database consists 1530 measurements 1248 measurements. follow closely, with a typical time delay about 20 days. However, year-by-year analysis shows that magnitude emission-line is correlated mean flux. argue data are consistent simple model prediction between size broad-line region ionizing luminosity, r ∝ L. Moreover, apparently linear...
Optical and near-infrared observations of the Type Ic supernova (SN) 2004aw are presented, obtained from day -3 to +413 with respect B-band maximum. The photometric evolution is characterised by a comparatively slow post-maximum decline light curves. peaks in redder bands significantly delayed relative bluer bands, I-band maximum occurring 8.4 days later than that B. With an absolute peak magnitude -18.02 V band SN can be considered fairly bright, but not exceptional. This also holds for U...
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves spectra closely resemble those prototypical SN 1992A, luminosity at maximum (M_B = -19.08) is close to average for a Ia. However, ejected 56Ni mass derived by modelling bolometric curve (about 0.45 solar masses) lies near lower limit distribution observed in normal SNe Accordingly, 2004eo shows relatively rapid post-maximum decline (Delta m_(B) 1.46), small expansion velocities ejecta,...