Search Publications
High-resolution Spectroscopic Monitoring Observations of FU Orionis-type Object, V960 Mon
Lee, Jeong-Eun; Pyo, Tae-Soo; Park, Sunkyung +9 more
We present the results of high-resolution (R ≥ 30,000) optical and near-infrared (NIR) spectroscopic monitoring observations of an FU Orionis-type object (FUor), V960 Mon, which underwent an outburst in 2014 November. We have monitored this object with the Bohyunsan Optical Echelle Spectrograph and the Immersion GRating INfrared Spectrograph since…
Inferring the parallax of Westerlund 1 from Gaia DR2
Drout, Maria R.; Smith, Nathan; Stassun, Keivan G. +6 more
Westerlund 1 (Wd1) is potentially the largest star cluster in the Galaxy. That designation critically depends upon the distance to the cluster, yet the cluster is highly obscured, making luminosity-based distance estimates difficult. Using Gaia Data Release 2 (DR2) parallaxes and Bayesian inference, we infer a parallax of 0.35^{+0.07}_{-0.06} mas …
Scaling relations and baryonic cycling in local star-forming galaxies. I. The sample
Hunt, L. K.; Ginolfi, M.; Schneider, R. +2 more
Metallicity and gas content are intimately related in the baryonic exchange cycle of galaxies, and galaxy evolution scenarios can be constrained by quantifying this relation. To this end, we have compiled a sample of ∼400 galaxies in the local Universe, dubbed "MAGMA" (Metallicity And Gas for Mass Assembly), which covers an unprecedented range in …
The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri
Lewis, Geraint F.; Ting, Yuan-Sen; Buder, Sven +17 more
Using kinematics from Gaia and the large elemental abundance space of the second data release of the GALAH survey, we identify two new members of the Fimbulthul stellar stream, and chemically tag them to massive, multimetallic globular cluster ω Centauri. Recent analysis of the second data release of Gaia had revealed the Fimbulthul stellar stream…
Spectroscopy and polarimetry of the gravitationally lensed quasar SDSS J1004+4112 with the 6m SAO RAS telescope
Popović, L. Č.; Afanasiev, V. L.; Fian, C. +5 more
Context. We present new spectroscopic and polarimetric observations of the gravitational lens SDSS J1004+4112 taken with the 6 m telescope of the Special Astrophysical Observatory (Russia).
Aims: In order to explain the variability that is observed only in the blue wing of the C IV emission line, corresponding to image A, we analyze the spect…
The GAPS Programme at TNG. XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
Baratella, M.; Mallonn, M.; Scandariato, G. +20 more
Context. The detailed chemical composition of stars is important in many astrophysical fields, among which is the characterisation of exoplanetary systems. Previous studies seem to indicate an anomalous chemical pattern of the youngest stellar population in the solar vicinity that has sub-solar metal content. This can influence various observation…
Blazar Variability: A Study of Nonstationarity and the Flux-Rms Relation
Bhattacharyya, Joy; Ghosh, Ritesh; Chatterjee, Ritaban +1 more
We analyze X-ray light curves of the blazars Mrk 421, PKS 2155-304, and 3C 273 using observations by the Soft X-ray Telescope on board AstroSat and archival XMM-Newton data. We use light curves of length 30-90 ks from three to four epochs for all three blazars. We apply the autoregressive integrated moving average model, which indicates the variab…
Gaia-DR2 extended kinematical maps. III. Rotation curves analysis, dark matter, and MOND tests
Wang, H. -F.; López-Corredoira, M.; Chrobáková, Ž. +2 more
Context. Recent statistical deconvolution methods have produced extended kinematical maps in a range of heliocentric distances that are a factor of two to three larger than those analysed in Gaia Collaboration (2018, A&A, 616, A11) based on the same data.
Aims: In this paper, we use such maps to derive the rotation curve both in the Galac…
A search for star clusters in the outskirts of the Large Magellanic Cloud: indication of clusters in the age gap
Cignoni, M.; Tosi, M.; Ripepi, V. +7 more
The YMCA (Yes, Magellanic Clouds Again) and STEP (The SMC in Time: Evolution of a Prototype interacting late-type dwarf galaxy) projects are deep g, i photometric surveys carried out with the VLT Survey Telescope (VST) and devoted to study the outskirts of the Magellanic System. A main goal of YMCA and STEP is to identify candidate stellar cluster…
Search for Planets in Hot Jupiter Systems with Multi-Sector TESS Photometry. I. No Companions in Planetary Systems KELT-18, KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126
Maciejewski, G.
Origins of giant planets on tight orbits, so called hot Jupiters, are a long-lasting question in the planetary formation and evolution theory. The answer seems to be hidden in architectures of those systems that remain only partially understood. Using multi-sector time-series photometry from the Transiting Exoplanet Survey Satellite, we searched f…