Search Publications
A revision of the vdB 130 cluster stellar content based on Gaia DR2 data: interstellar extinction toward the Cyg OB1 supershell
Rastorguev, A. S.; Egorov, O. V.; Sitnik, T. G. +3 more
Two star-forming regions are studied: the young embedded open cluster vdB 130 and the protocluster neighbourhood observed in the head and tail of the cometary molecular cloud located in the wall of the expanding supershell surrounding the Cyg OB1 association. The Gaia DR2 catalogue is employed to verify the stellar composition of the vdB 130 clust…
Far-infrared star formation rates of six GRB host galaxies with ALMA
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +7 more
Gamma-ray bursts (GRBs) can be a promising tracer of cosmic star formation rate history (CSFRH). In order to reveal the CSFRH using GRBs, it is important to understand whether they are biased tracers or not. For this purpose, it is crucial to understand properties of GRB host galaxies, in comparison to field galaxies. In this work, we report ALMA …
Spin clusters inside four young asteroid groups
Spoto, F.; Carruba, V.; Ramos, L. G. M.
Asteroid groups may either form because of collisions or because of spin induced fission. Recently it has been shown that young spin clusters tend to form more frequently in young collisional families than in older groups. Here, we study the occurrence of spin clusters inside four very recently identified asteroid groups: the (525) Adelaide, (2258…
Hypercompact stellar clusters: morphological renditions and spectrophotometric models
Hernandez, S.; Kostrzewa-Rutkowska, Z.; Jonker, P. G. +2 more
Numerical relativity predicts that the coalescence of a black hole (BH) binary causes the newly formed BH to recoil, and evidence for such recoils has been found in the gravitational waves observed during the merger of stellar-mass BHs. Recoiling (super)massive BHs are expected to reside in hypercompact stellar clusters (HCSCs). Simulations of gal…
The brown dwarf population in the star-forming region NGC 2264
Scholz, Aleks; Teixeira, Paula S.; Eislöffel, Jochen +2 more
The brown dwarf population in the canonical star-forming region NGC 2264 is so far poorly explored. We present a deep, multiwavelength, multiepoch survey of the star-forming cluster NGC 2264, aimed to identify young brown dwarf candidates in this region. Using criteria including optical/near-infrared (IR) colours, variability, Spitzer mid-IR colou…
Improved photometric redshifts with colour-constrained galaxy templates for future wide-area surveys
Chary, Ranga-Ram; Lee, Bomee
Cosmology and galaxy evolution studies with LSST, Euclid, and Roman, will require accurate redshifts for the detected galaxies. In this study, we present improved photometric redshift estimates for galaxies using a template library that populates three-colour space and is constrained by HST/CANDELS photometry. For the training sample, we use a sam…
Chromospheric plasma ejection above a pore
Bharti, L.; Sobha, B.; Quintero Noda, C. +2 more
We present high spatial resolution observations of short-lived transients, ribbons and jet-like events above a pore in Ca II H images where fine structure, like umbral dots, light bridges and penumbral microfilaments, is present in the underlying photosphere. We found that current layers are formed at the edges of the convective fine structure, du…
TFAW survey - I. Wavelet-based denoising of K2 light curves. Discovery and validation of two new Earth-sized planets in K2 campaign 1
del Ser, D.; Fors, O.
The wavelet-based detrending and denoising method TFAW is applied for the first time to EVEREST 2.0-corrected light curves to further improve the photometric precision of almost all K2 observing campaigns (C1-C8, C12-C18). The performance of both methods is evaluated in terms of 6 h combined differential photometric precision (CDPP), simulated tra…
Updated pulsation period relations of γ Dor-type stars in eclipsing binaries: the case of KIC 2557430
Çakırlı, Ömür; Hoyman, Barış; Özdarcan, Orkun
We employ optical spectroscopy and Kepler photometry to derive the physical properties and pulsational characteristics of the detached system KIC 2557430. We find that the system is formed by F-type components. Combining results from the analysis of spectroscopic data and Kepler photometry, we calculate masses and radii of the primary and the seco…
Infrared photometry of the dwarf nova V2051 Ophiuchi - II. The quiescent accretion disc and its spiral arms
Baptista, Raymundo; Wojcikiewicz, Eduardo
We report the analysis of time-series of infrared JHKs photometry of the dwarf nova V2051 Oph in quiescence with eclipse mapping techniques to investigate structures and the spectrum of its accretion disc. The light curves after removal of the ellipsoidal variations caused by the mass-donor star show a double-wave modulation signalling …