Search Publications
A new method for determining the total electron content in Mars' ionosphere based on Mars Express MARSIS data
Witasse, Olivier; Sánchez-Cano, Beatriz; Kofman, Wlodek +5 more
We present a new method for determining the total electron content (TEC) in the Martian ionosphere based on the time delay of received radar pulses of the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on board the Mars Express spacecraft. Previous studies of the same dataset have produced differing results for the day-side i…
Phase-resolved Analyses of Millihertz Quasi-periodic Oscillations in 4U 1636-53 using the Hilbert-Huang Transform
Chou, Yi; Hsieh, Hung-En
We present phase-resolved spectroscopy based on the Hilbert-Huang transform (HHT) for millihertz quasi-periodic oscillations (mHz QPOs) in 4U 1636-53. The ∼8 mHz QPO can be detected approximately several thousand seconds before a type-I X-ray burst. It has been interpreted as marginally stable burning on the neutron-star surface. In this study, we…
A rare case of FR I interaction with a hot X-ray bridge in the A2384 galaxy cluster
Durret, F.; Parekh, V.; Laganá, T. F. +3 more
Clusters of varying mass ratios can merge and the process significantly disturbs the cluster environments and alters their global properties. Active radio galaxies are another phenomenon that can also affect cluster environments. Radio jets can interact with the intracluster medium (ICM) and locally affect its properties. Abell 2384 (hereafter A23…
Investigation on the mass transferring near-contact binary TT Cet
Tian, Xiao-Man; Chang, Lin-Feng
First multi-colour complete light curves and low-resolution spectra of short-period eclipsing binary TT Cet are presented. The stellar atmospheric parameters of the primary star were derived through spectra fitting as: $T_{eff}=7 091±124 {K}$, $\log g = 4.15±0.33 {cm}/s^2$, and $[Fe/H]=-0.23±0.04 dex$. The light curves were analysed using the Wils…
Numerical Analysis of Shock Layer Ionization during the Entry of the Schiaparelli Spacecraft into the Martian Atmosphere
Surzhikov, S. T.
The paper presents a numerical analysis of aerophysical nonequilibrium processes occurring near the surface of the Schiaparelli entry vehicle in the region of hypersonic flight in the dense Martian atmosphere. The two-dimensional model realized is based on the system of self-consistent equations of nonequilibrium physical and chemical mechanics of…
Orbits for Eight Binaries
Cvetković, Z.; Pavlović, R.
The subject of the present paper is the analysis of the orbital solutions for eight binaries: WDS 02402+0436 = HDS 347, WDS 02552+5950 = MLR 520, WDS 03119+6131 = HDS 407, WDS 04570+7350 = YSC 145, WDS 05202+4105 = HDS 701, WDS 06467+0822 = HDS 940AB, WDS 08259-1623 = HDS 1199, and WDS 22550+5132 = HU 785. Seven orbits are determined for the first…
WIYN Open Cluster Study LXXX: HDI CCD UBVRI Photometry of the Old Open Cluster NGC 7142 and Comparison to M67
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P. +2 more
We present UBVRI photometry of 8702 stars in a 0°5 × 0°5 field in the direction of NGC 7142, taken with the Half Degree Imager at the WIYN 0.9 m telescope, to improve knowledge of this cluster's basic parameters. Our photometry spans the ranges 10.6-20.4 mag in U, 10.6-22.0 mag in B, 10.0-21.8 mag in V, 9.2-20.7 mag in R, and 8.5-19.9 mag in I. Us…
A super-Earth and a mini-Neptune around Kepler-59
Nesvorný, D.; Roig, F.; Saad-Olivera, X. +2 more
We characterize the radii and masses of the star and planets in the Kepler-59 system, as well as their orbital parameters. The star parameters are determined through a standard spectroscopic analysis, resulting in a mass of 1.359± 0.155 M_⊙ and a radius of 1.367± 0.078 R_⊙. The obtained planetary radii are 1.5± 0.1 R_\oplus for the inner and 2.2± …
Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets. I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391
Almenara, J. M.; Díaz, R. F.; Martioli, E. +10 more
Aims: Kepler-278 and Kepler-391 are two of the three evolved stars known to date on the red giant branch (RGB) to host multiple short-period transiting planets. Moreover, the planets orbiting Kepler-278 and Kepler-391 are among the smallest discovered around RGB stars. Here we present a detailed stellar and planetary characterization of these…
ALMA Observations of the Molecular Clouds in NGC 625
De Looze, Ilse; Cormier, Diane; Faesi, Christopher M. +1 more
We present the highest-resolution (1″) 12CO observations of molecular gas in the dwarf starburst galaxy NGC 625 to date, obtained with Atacama Large Millimeter/submillimeter Array. The molecular gas, which is distributed in discrete clouds within an area of 0.4 kpc2, does not have well-ordered large-scale motions. We measure …