A5068180090- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Particle Detector Development and Performance
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Crystal Structures and Properties
- Galaxies: Formation, Evolution, Phenomena
- Catalysis and Oxidation Reactions
- Particle accelerators and beam dynamics
- SAS software applications and methods
- Historical Astronomy and Related Studies
- Classical Antiquity Studies
University of Warsaw
2012-2021
University of Wrocław
2009
Netherlands Institute for Radio Astronomy
2008
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...
The All-Sky Automated Survey for Supernovae (ASAS-SN) is working toward imaging the entire visible sky every night to a depth of mag. present data covers and spans ∼2–5 years with ∼100–400 epochs observation. should contain some ∼1 million variable sources, ultimate goal have database these observations publicly accessible. We describe here first step, simple but unprecedented web interface https://asas-sn.osu.edu/ that provides an up date aperture photometry light curve any user-selected...
The All-Sky Automated Survey for Supernovae (ASAS-SN) is the first optical survey to routinely monitor whole sky with a cadence of $\sim2-3$ days down V$\lesssim17$ mag. ASAS-SN has monitored since 2014, collecting $\sim100-500$ epochs observations per field. V-band light curves candidate variables identified during search supernovae are classified using random forest classifier and visually verified. We present catalog 66,179 bright, new variable stars discovered our supernovae, including...
We present ground-based and Swift photometric spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at center PGC 043234 ($d\simeq90$ Mpc) by All-Sky Automated Survey for SuperNovae (ASAS-SN). The source had a peak bolometric luminosity $L\simeq10^{44}$ ergs s$^{-1}$ total integrated energy $E\simeq7\times10^{50}$ radiated over $\sim6$ months presented. UV/optical emission is well-fit blackbody with roughly constant temperature $T\sim35,000$ K, while...
ASASSN-14ae is a candidate tidal disruption event (TDE) found at the center of SDSS J110840.11+340552.2 ($d\simeq200$~Mpc) by All-Sky Automated Survey for Supernovae (ASAS-SN). We present ground-based and Swift follow-up photometric spectroscopic observations source, finding that transient had peak luminosity $L\simeq8\times10^{43}$~erg~s$^{-1}$ total integrated energy $E\simeq1.7\times10^{50}$ ergs radiated over $\sim5$ months presented. The blackbody temperature remains roughly constant...
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...
The variable stars in the VSX catalog are derived from a multitude of inhomogeneous data sources and classification tools. This inhomogeneity complicates our understanding star types, statistics, properties, it directly affects attempts to build training sets for current (and next) generation all-sky, time-domain surveys. We homogeneously analyze ASAS-SN V-band light curves ${\sim}412,000$ variables catalog. classified using an updated random forest classifier with $F_1$ score 99.4\%...
We present ground-based and Swift photometric spectroscopic observations of the tidal disruption event (TDE) ASASSN-15oi, discovered at centre 2MASX J20390918−3045201 (d ≃ 216 Mpc) by All-Sky Automated Survey for SuperNovae. The source peaked a bolometric luminosity L 1.3 × 1044 erg s−1 radiated total energy E 6.6 1050 over first ∼3.5 months observations. early optical/UV emission can be fit blackbody with temperature increasing from T ∼ 2 104 K to 4 while declines 2.3 1043 s−1, requiring...
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (${\sim}4$ yrs) light curves sources brighter than V$\lesssim17$ mag across the whole sky. Transiting Exoplanet Satellite (TESS) has started to produce high-quality with a of at least 27 days, eventually most combination ASAS-SN and TESS probes both short term variability in great detail, especially towards continuous viewing zones (CVZ) ecliptic poles. We have produced ${\sim}1.3$ million V-band covering total...
Stars of stellar type later than about M3.5 are believed to be fully convective and therefore unable support magnetic dynamos like the one that produces 11-year solar cycle. Because their intrinsic faintness, very few late M stars have undergone long-term monitoring test this prediction, which is critical our understanding field generation in such stars. Magnetic activity also interest as driver UV X-ray radiation, well energetic particles winds, affect atmospheres close-in planets lie...
Proxima could host a planet on ∼5-year orbit, which Gaia can confirm in the near future providing its exact mass.
Abstract The All Sky Automated Survey (ASAS) is a long-term project to monitor bright variable stars over the whole sky. It has discovered 50 099 variables brighter than V < 14 mag south of declination +28°, and among them 11 076 eclipsing binaries. We present preliminary analysis 5384 contact, 2949 semi-detached, 2743 detached systems. statistics distribution provides qualitative confirmation decades old idea Flannery Lucy that W UMa-type binaries evolve through series relaxation...
We present ASAS data starting 25 days before the discovery of recent type IIn SN 2010jl, and we compare its light curve to other luminous SNe, showing that it is a (M_I ~ -20.5) event. Its host galaxy, UGC 5189, has low gas-phase oxygen abundance (12 + log(O/H) = 8.2), which reinforces emerging trend over-luminous core-collapse supernovae are found in low-metallicity tail galaxy distribution, similar known for hosts long GRBs. compile abundances from literature our own observations an...
This catalog summarizes information for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) and other bright ($m_{peak}\leq17$), spectroscopically confirmed in 2016. We then gather near-IR through UV magnitudes of host galaxies offsets from centers their hosts public databases. illustrate results using a sample that now totals 668 since 2014 May 1, including our previous catalogs, with type distributions closely matching those ideal magnitude limited Li et al....
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (${\sim}4$ yrs) light curves sources brighter than V$\lesssim17$ mag across the whole sky. As part of our effort to characterize variability all stellar visible in ASAS-SN, we have produced ${\sim}30.1$ million V-band southern hemisphere using APASS DR9 catalog as input source list. We systematically searched these a pipeline based on random forest classifiers. identified ${\sim} 220,000$ variables, including...
We present basic statistics for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) during its first year-and-a-half of operations, spanning 2013 and 2014. also same information other bright ($m_V\leq17$), spectroscopically confirmed from 2014 May 1 through end 2014, providing a comparison to ASAS-SN sample starting point where became operational in both hemispheres. In addition, we collected redshifts near-UV IR magnitudes, available, host galaxies samples. This...
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (${\sim}4$ yrs) $V-$band light curves sources brighter than V$\lesssim17$ mag across the whole sky. We produced V-band a total of ${\sim}61.5$ million and systematically searched these variability. identified ${\sim} 426,000$ variables, including 219,000$ new discoveries. Most (${\sim}74\%$) our discoveries are in Southern hemisphere. Here we use spectroscopic information from LAMOST, GALAH, RAVE, APOGEE to study...
This manuscript presents information for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) during 2015, its second full year of operations. The same is presented bright (mV ≤ 17), spectroscopically confirmed other sources in 2015. As with first ASAS-SN supernova catalogue, we also present redshifts and near-ultraviolet through infrared magnitudes host galaxies both samples. Combined our previous this work comprises a complete catalogue 455 from multiple...
On 2014 Dec. 9.61, the All-Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin") discovered ASASSN-14lp just $\sim2$ days after first light using a global array of 14-cm diameter telescopes. went on to become bright supernova ($V = 11.94$ mag), second only SN 2014J year. We present prediscovery photometry (with detection less than day light) and ultraviolet through near-infrared photometric spectroscopic data covering rise fall more 100 days. find that had broad curve ($\Delta...
In this catalog we compile information for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) as well other bright ($m_{peak}\leq17$), spectroscopically confirmed found in 2017, totaling 308 supernovae. We also present UV through near-IR magnitudes gathered from public databases of host galaxies sample. perform statistical analyses our full supernova sample, which now contains 949 since 2014 May 1, including previous catalogs. This is fourth a series yearly papers...
Technical description of the new project called All Sky Automated Survey and results tests our prototype instrument are presented. The ultimate goal this is photometric monitoring large area sky with fully automated, low cost instruments. Possible applications indicated future prospects discussed. At present over hundred square degrees observed 5-10 times each night in I-band, alowing us to monitor 30 000 stars brighter than 12-13 magnitude. Full description, pictures current status can be...
MOST (Microvariability & Oscillations of STars) and ASAS (All Sky Automated Survey) observations have been used to characterize photometric variability TW Hya on time scales from a fraction day 7.5 weeks few days 8 years, respectively. The two data sets very different uncertainties temporal coverage properties cannot be directly combined, nevertheless, they suggests global spectrum with "flicker noise" properties, i.e. amplitudes ~ 1/sqrt(f), over >4 decades in frequency, the range f...
We report new mid-eclipse times of the two close binaries NSVS14256825 and HS0705+6700, harboring an sdB primary a low-mass main-sequence secondary. Both objects display clear variations in measured orbital period, which can be explained by action third object orbiting binary. If this interpretation is correct, giant planet with mass roughly 12 M_Jup. For we provide evidence that strengthens case for suggested periodic nature eclipse time variation reduces uncertainties parameters brown...
We present very early UV to optical photometric and spectroscopic observations of the peculiar Type IIn supernova (SN) 2011ht in UGC 5460. The rise peak are only second ever recorded for a SN by far most complete. SN, first classified as impostor, slowly rose M_V \sim -17 \sim55 days. In contrast \sim2 magnitude increase v-band light curve from observation until peak, flux increased >7 magnitudes. spectra dominated strong, Balmer emission with narrow peaks (FWHM\sim600 km/s), broad...
We discuss ASASSN-13db, an EX Lupi-type ("EXor") accretion event on the young stellar object (YSO) SDSS J051011.01$-$032826.2 (hereafter SDSSJ0510) discovered by All-Sky Automated Survey for SuperNovae (ASAS-SN). Using archival photometric data of SDSSJ0510 we construct a pre-outburst spectral energy distribution (SED) and find that it is consistent with low-mass class II YSO near Orion star forming region ($d \sim 420$ pc). present follow-up spectroscopic observations source after $\Delta V...