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Colour-colour and colour-magnitude diagrams for hot Jupiters
Bailey, J.; Melville, G.; Kedziora-Chudczer, L.
We use ground-based and space-based eclipse measurements for the near-infrared (IR) bands (JHKs) and Spitzer 3.6- and 4.5-µm bands to construct colour-colour and colour-magnitude diagrams for hot Jupiters. We compare the results with previous observations of substellar objects and find that hot Jupiters, when corrected for their i…
Analysis of Close Stellar Encounters with the Solar System
Bobylev, V. V.; Bajkova, A. T.
We consider 36 candidates for close (within 1 pc) encounters with the Solar system. These stars have been selected in accordance with the results of an analysis of their motion obtained by various authors. For most stars from this list the kinematic characteristics have been taken from the Gaia DR2 catalogue. The parameters of the encounters of th…
Solar Filaments and Interplanetary Magnetic Field Bz
Martens, Petrus C.; Aparna, V.
The direction of the axis of an interplanetary coronal mass ejection (ICME) plays an important role in determining if it will cause a geomagnetic disturbance in the Earth's magnetosphere upon impact. Long period southward-pointing ICME fields are known to cause significant space weather impacts and thus geomagnetic storms. We present an extensive …
A New Transition Wolf-Rayet WN/C Star in the Milky Way
Shi, Jianrong; Zhang, Tianmeng; Todt, Helge +7 more
We report the discovery of a new transition type Wolf-Rayet (W-R) WN/C star in the Galaxy. According to its coordinates (R.A., decl.)J2000 = ${18}^{{\rm{h}}}{51}^{{\rm{m}}}39\buildrel{\rm{s}}\over{.} 7$ , -05°34'51"1, and the distance (7.11 ${}_{-1.22}^{+1.56}\,$ kpc away from Earth) inferred from the second Gaia data release, it is fou…
CME Productive and Non-productive Recurring Jets Near an Active Region AR11176
Srivastava, Abhishek K.; Dwivedi, Bhola N.; Solanki, Ritika
We study the recurring jets near AR11176 during the period 2011 March 31 17:00 UT to April 1 05:00 UT using observations from the Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO). Mini-filaments (mini-filament1 & 2) are found at the base of these recurring jets where mini-filament1 shows the partial signature of eru…
Quantifying the Toroidal Flux of Preexisting Flux Ropes of Coronal Mass Ejections
Qiu, Jiong; Cheng, X.; Ding, M. D. +3 more
In past decades, much progress has been achieved in understanding the origin and evolution of coronal mass ejections (CMEs). In situ observations of the counterparts of CMEs, especially magnetic clouds (MCs) near the Earth, have provided measurements of the structure and total flux of CME flux ropes. However, it has been difficult to measure these…
A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
Maíz Apellániz, J.; Fullerton, A. W.; Barbá, R. H. +9 more
HD 54662 AB is one of the three O + OB binaries known so far with orbital period longer than 1000 d, offering the opportunity to test scenarios of massive star formation and models of single stellar evolution. Here, we present a detailed study of this system based on new high-resolution spectra and data. A disentangling method is used to recover t…
A detailed view on the circumstellar environment of the M-type AGB star EP Aquarii. I. High-resolution ALMA and SPHERE observations
Decin, Leen; Montargès, Miguel; Millar, Tom J. +3 more
Cool evolved stars are known to be significant contributors to the enrichment of the interstellar medium through their dense and dusty stellar winds. High resolution observations of these outflows have shown them to possess high degrees of morphological complexity. We observed the asymptotic giant branch (AGB) star EP Aquarii with ALMA in band 6 a…
NLTE modeling and spectroscopically derived abundances of lithium and beryllium for classical nova ejecta
Shore, Steven N.; De Gennaro Aquino, Ivan
Context. Extreme super-solar abundances of lithium and beryllium have been reported in recent years for classical novae based on absorption lines in ultraviolet and optical spectra during the optically thick stages, but these findings have not been compared with spectrum syntheses of the ejecta.
Aims: We present a grid of nova ejecta models c…
Calibrating the Galactic Cepheid Period-Luminosity Relation from the Maximum-likelihood Technique
Lazovik, Yaroslav A.; Rastorguev, Alexey S.
We present a realization of the maximum-likelihood technique, which is one of the latest modifications of the Baade-Becker-Wesselink method. Our approach is based on nonlinear calibrations of the effective temperature and bolometric correction, which take into account metallicity and surface gravity. It allows one to estimate the key Cepheid param…