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A hundred new eclipsing binary system candidates studied in a near-infrared window in the VVV survey
Minniti, D.; Saito, R. K.; Palma, T. +4 more
We present the first results obtained from an extensive study of eclipsing binary (EB) system candidates recently detected in the VISTA Variables in the Vía Láctea (VVV) near-infrared (NIR) Survey. We analyse the VVV tile d040 in the southern part of the Galactic disc wherein the interstellar reddening is comparatively low, which makes it possible…
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…
Robust Adaptive Spacecraft Array Derivative Analysis
Vogt, J.; Blagau, A.; Pick, L.
Multispacecraft missions such as Cluster, Themis, Swarm, and MMS contribute to the exploration of geospace with their capability to produce gradient and curl estimates from sets of spatially distributed in situ measurements. This paper combines all existing estimators of the reciprocal vector family for spatial derivatives and their errors. The re…
New H I observations of KK 69. Is KK 69 a dwarf galaxy in transition?
Koribalski, B. S.; Benaglia, P.; Saponara, J. +1 more
We present new H I data of the dwarf galaxy KK 69, obtained with the Giant Metrewave Radio Telescope (GMRT) with a signal-to-noise ratio almost double previous observations. We carried out a Gaussian spectral decomposition and stacking methods to identify the cold neutral medium (CNM) and the warm neutral medium (WNM) of the H I gas. We found that…
Soft proton scattering at grazing incidence from X-ray mirrors: analysis of experimental data in the framework of the non-elastic approximation
Santangelo, Andrea; Molendi, Silvano; Lotti, Simone +9 more
Astronomical X-ray observatories with grazing incidence optics face the problem of pseudo-focusing of low energy protons from the mirrors towards the focal plane. Those protons constitute a variable, unpredictable component of the non X-ray background that strongly affects astronomical observations and a correct estimation of their flux at the foc…
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…