A5075596553- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- SAS software applications and methods
- Superconducting Materials and Applications
- Neutrino Physics Research
- Atmospheric Ozone and Climate
- Space Exploration and Technology
- Archaeological and Historical Studies
- Geological and Geophysical Studies
- Spacecraft and Cryogenic Technologies
Las Campanas Observatory
2015-2024
Carnegie Institution for Science
2009-2020
Texas A&M University
2012-2020
Mitchell Institute
2020
Carnegie Observatories
2008-2018
Consejo Nacional de Investigaciones Científicas y Técnicas
1997-2018
Instituto de Astrofísica de La Plata
2018
Max Planck Institute for Astrophysics
2018
Federico Santa María Technical University
2017
Trinity House
2014
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...
On 2017 August 17, gravitational waves were detected from a binary neutron star merger, GW170817, along with coincident short gamma-ray burst, GRB170817A. An optical transient source, Swope Supernova Survey 17a (SSS17a), was subsequently identified as the counterpart of this event. We present ultraviolet, and infrared light curves SSS17a extending 10.9 hours to 18 days post-merger. constrain radioactively-powered resulting ejection neutron-rich material. The fast rise curves, subsequent...
The Ninth Catalogue of Spectroscopic Binary Orbits (http://sb9.astro.ulb.ac.be) continues the series compilations spectroscopic orbits carried out over past 35 years by Batten and collaborators. As 2004 May 1st, new holds for 2386 systems. Some essential differences between this catalogue its predecessors are outlined three straightforward applications presented: (1) completeness assessment: period distribution SB1s SB2s; (2) shortest periods across H-R diagram; (3) period-eccentricity relation.
view Abstract Citations (513) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars Abt, Helmut A. ; Morrell, Nidia I. We obtained new data to determine whether the spectral appearance of A-type stars is entirely determined by their rotational velocities. For this purpose we derived velocities for 1700 northern from CCD coudé spectra, calibrated with Slettebak...
We present the second installment of GOSSS, a massive spectroscopic survey Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R ∼ 2500 digital observations from both hemispheres selected O-Star Catalog (GOSC). In this paper we include bright stars and other objects drawn mostly first version GOSC, all them south δ = −20°, for total number 258 stars. also revise northern sample Paper I to provide full list spectroscopically classified complete B 8, bringing published...
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...
On 2017 August 17, Swope Supernova Survey 2017a (SSS17a) was discovered as the optical counterpart of binary neutron star gravitational wave event GW170817. We report time-series spectroscopy SSS17a from 11.75 hours until 8.5 days after merger. Over first hour observations ejecta rapidly expanded and cooled. Applying blackbody fits to spectra, we measure photosphere cooling $11,000^{+3400}_{-900}$ K $9300^{+300}_{-300}$ K, determine a photospheric velocity roughly 30% speed light. The...
We present the first installment of a massive spectroscopic survey Galactic O stars, based on new, high signal-to-noise ratio, R~2500 digital observations from both hemispheres selected O-Star Catalog Ma\'iz Apell\'aniz et al. (2004) and Sota (2008). The spectral classification system is rediscussed new atlas presented, which supersedes previous versions. Extensive sequences exceptional objects are given, including types Ofc, ON/OC, Onfp, Of?p, Oe, double-lined binaries. remaining normal...
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...
In providing an independent measure of the expansion history universe, Carnegie Supernova Project (CSP) has observed 71 high-z Type Ia supernovae (SNe Ia) in near-infrared bands Y and J. These can be used to construct rest-frame i-band light curves which, when compared a low-z sample, yield distance moduli that are less sensitive extinction and/or decline-rate corrections than optical. However, working with NIR photometry presents unique challenges necessitated development new set...
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...
Photons from a gravitational wave event Two neutron stars merging together generate signal and have also been predicted to emit electromagnetic radiation. When the GW170817 was detected, astronomers rushed search for source using conventional telescopes (see Introduction by Smith). Coulter et al. describe how One-Meter Two-Hemispheres (1M2H) collaboration first locate source. Drout present 1M2H measurements of its optical infrared brightness, Shappee report their spectroscopy event, which is...
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...
Superluminous supernovae (SLSNe) are very bright explosions that were only discovered recently and show a preference for occurring in faint dwarf galaxies. Understanding why stellar evolution yields different types of these environments is fundamental order to both uncover the elusive progenitors SLSNe study star formation In this paper, we present first results our project SUperluminous Supernova Host galaxIES, focusing on sample which have obtained spectroscopy. We SLSNe-I SLSNe-R...
We report the discovery of ASASSN-15lh (SN 2015L), which we interpret as most luminous supernova yet found. At redshift z = 0.2326, reached an absolute magnitude M_{u,AB} -23.5+/-0.1 and bolometric luminosity L_bol (2.2+/-0.2)x 10^45 ergs s^-1, is more than twice any previously known supernova. It has several major features characteristic hydrogen-poor super-luminous supernovae (SLSNe-I), whose energy sources progenitors are currently poorly understood. In contrast to SLSNe-I that reside in...
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...
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, secondary near-Earth binary (65803) Didymos, and changing orbital period Dimorphos. A change in approximately 7 min was expected if incident momentum from DART directly transferred to target perfectly inelastic collision 1 , but studies probable impact conditions properties indicated that considerable enhancement ( β )...
view Abstract Citations (77) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar Multiplicity in the Scorpius-Centaurus Association Levato, Hugo ; Malaroda, Stella Morrell, Nidia Solivella, Gladys Radial velocities are determined for 81 members of Sco-Cen association order to discover radial velocity variables. The first orbits computed 10 systems, along with improved orbital elements another seven using published observations both cases....
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...
High-quality, blue-violet spectroscopic data are collected for 24 stars that have been classified as type O3 and display the hallmark N IV V lines. A new member of class is presented; it second known in Cyg OB2 association, only northern hemisphere. New digital also presented several other stars. Although inhomogeneous, uniform plots by subcategory reveal some interesting relationships. Several issues concerning classification hottest O-type spectra discussed, five original dwarfs Carina...
Using archival Sloan Digital Sky Survey (SDSS) multi-epoch imaging data (Stripe 82), we have searched for the tidal disruption of stars by supermassive black holes in non-active galaxies. Two candidate events (TDEs) are identified. The TDE flares optical blackbody temperatures 2 × 104 K and observed peak luminosities Mg = −18.3 −20.4 (νLν 5 1042, 4 1043 erg s−1, rest frame); their cooling rates very low, qualitatively consistent with expectations flares. properties candidates examined using...