Search Publications
A VLBI study of the wind-wind collision region in the massive multiple HD 167971
Galván-Madrid, R.; Brandner, W.; Herrero-Illana, R. +7 more
Context. Colliding winds in massive binaries are able to accelerate particles up to relativistic speeds as the result of the interaction between the winds of the different stellar components. HD 167971 exhibits this phenomenon which makes it a strong radio source.
Aims: We aim at characterizing the morphology of the radio emission and its dep…
A New South Polar Digital Terrain Model of Mars from the High-Resolution Stereo Camera (HRSC) onboard the ESA Mars Express
Muller, Jan-Peter; Putri, Alfiah Rizky Diana; Sidiropoulos, Panagiotis +2 more
The first high-resolution Digital Terrain Model (DTM) of the entire South Pole of Mars has been produced. A modified version (Kim and Muller, 2009) of a NASA-VICAR-based pipeline developed by DLR (German Aerospace Centre) and JPL (Jet Propulsion Laboratory) has been employed with image matching based on the Gotcha (Gruen-Otto-Chau) algorithm (Shin…
Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Shi, X. +44 more
By using the Rosetta/OSIRIS-NAC data set taken in 2014 August, we focus on the neck region, called Hapi, located on 67P Churyumov-Gerasimenko's Northern hemisphere. The gravitational potential and slopes of Hapi, coupled with the geological unit identification and the boulder size-frequency distributions, support the interpretation that both talus…
A Three-dimensional View of Molecular Hydrogen in SN 1987A
Larsson, J.; Spyromilio, J.; Fransson, C. +6 more
SN 1987A is the only young supernova (SN) in which H2 has been detected in the ejecta. The properties of H2 are important for understanding the explosion and the ejecta chemistry. Here we present new Very Large Telescope/SINFONI observations of H2 in SN 1987A, focusing on the 2.12 µm (1,0)S(1) line. We find t…
Development of models for nearbaby young stellar moving groups: creation, revision, and finalization of the models
Song, Inseok; Lee, Jinhee
In our previous research, we developed a tool for calculating Bayesian membership probability for nearby young stellar moving groups (BAMG: Bayesian Analysis of Moving Groups). The study presented the importance of careful construction of models in moving group membership assessment, using β Pictoris moving group as a test case. In this study, we …
Observations of Continuous Quasiperiodic Auroral Pulsations on Saturn in High Time-Resolution UV Auroral Imagery
Badman, S. V.; Yao, Z. H.; Bader, A. +2 more
Saturn's aurora represents the ionospheric response to plasma processes occurring in the planet's entire magnetosphere. Short-lived ∼1-hr quasiperiodic high-energy electron injections, frequently observed in in situ particle and radio measurements, should therefore entail an associated flashing auroral signature. This study uses high time-resoluti…
Fundamental properties of Kepler and CoRoT targets - IV. Masses and radii from frequencies of minimum Δν and their implications
Yıldız, M.; Kayhan, C.; çelik Orhan, Z.
Recently, by analysing the oscillation frequencies of 90 stars, Yıldız, Çelik Orhan & Kayhan have shown that the reference frequencies (νmin0, νmin1, and νmin2) derived from glitches due to He II ionization zone have very strong diagnostic potential for the determination of thei…
Observation of narrow polar jets in the nascent wind of oxygen-rich AGB star EP Aqr
Winters, J. M.; Tuan-Anh, P.; Hoai, D. T. +6 more
Using ALMA observations of 12CO(2-1), 28SiO(5-4), and 32SO2(166,10-175,13) emissions of the circumstellar envelope of AGB star EP Aqr, we describe the morpho-kinematics governing the nascent wind. Main results are as follows: (1) Two narrow polar structures, referred to as jets, lau…
Chromospheric observations and magnetic configuration of a supergranular structure
Leenaarts, Jorrit; Robustini, Carolina; de la Cruz Rodríguez, Jaime +1 more
Context. Unipolar magnetic regions are often associated with supergranular cells. The chromosphere above these regions is regulated by the magnetic field, but the field structure is poorly known. In unipolar regions, the fibrillar arrangement does not always coincide with magnetic field lines, and polarimetric observations are needed to establish …
Discovery of s-process enhanced stars in the LAMOST survey
Casey, Andrew R.; Ho, Anna Y. Q.; Ji, Alexander P. +7 more
Here we present the discovery of 895 s-process-rich candidates from 454 180 giant stars observed by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) using a data-driven approach. This sample constitutes the largest number of s-process enhanced stars ever discovered. Our sample includes 187 s-process-rich candidates that are e…