Search Publications
VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express
Zhang, Peijin; Xiong, Ming; Xia, Bo +13 more
The ESA's Mars Express solar corona experiments were performed at two solar conjunctions in the years 2015 and 2017 by a number of radio telescopes in the European VLBI Network. This paper presents the methods to measure the frequency and phase fluctuations of the spacecraft radio signal, and the applications to study the characteristics of the pl…
Discovery of an M-type companion to the Herbig Ae Star V1787 Ori
Arun, R.; Mathew, Blesson; Manoj, P. +4 more
The intermediate-mass Herbig Ae star V1787 Ori is a member of the L1641 star-forming region in the Orion A molecular cloud. We report the detection of an M-type companion to V1787 Ori at a projected separation of 6.66 arcsec (corresponding to 2577 au), from the analysis of VLT/NACO adaptive optics Ks-band image. Using astrometric data f…
Configuration of a Magnetic Cloud from Solar Orbiter and Wind Spacecraft In-situ Measurements
Zhao, Lingling; Hu, Qiang; He, Wen +1 more
Coronal mass ejections (CMEs) represent one type of the major eruption from the Sun. Their interplanetary counterparts, the interplanetary CMEs (ICMEs), are the direct manifestations of these structures when they propagate into the heliosphere and encounter one or more observing spacecraft. The ICMEs generally exhibit a set of distinctive signatur…
Reconstructing the infilling history within Robert Sharp crater, Mars: Insights from morphology and stratigraphy
Mangold, Nicolas; Le Deit, Laetitia; Hauber, Ernst +2 more
Recent mineralogical studies suggest past aqueous activities in the 150-km-wide Robert Sharp impact crater, the western neighbor of Gale crater on Mars. Despite their mineralogical similarities, Robert Sharp and Gale craters display very different morphologies. Using high-resolution orbital images, we made morphological and stratigraphical analyse…
Thermal Pressures in the Interstellar Medium away from Stellar Environments
Tripp, Todd M.; Jenkins, Edward B.
Interstellar thermal pressures can be measured using C I absorption lines that probe the pressure-sensitive populations of the fine-structure levels of its ground state. In a survey of C I absorption toward Galactic hot stars, Jenkins & Tripp found evidence of small amounts (~0.05%) of gas at high pressures ( $p/k\gg {10}^{4}\,{\mat…
Infrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)
Minniti, D.; Zoccali, M.; Contreras Ramos, R. +12 more
Context. Recent studies show that the inner Galactic regions host genuine bulge globular clusters, but also halo intruders, complex remnants of primordial building blocks, and objects likely accreted during major merging events.
Aims: In this study we focus on the properties of M 28, a very old and massive cluster currently located in the Gal…
Dust in RCW 58: Clues to common envelope channel formation?
Marston, A. P.; Toalá, J. A.; Jiménez-Hernández, P. +1 more
We present a characterization of the dust in the Wolf-Rayet (WR) nebula RCW 58 around the WN8h star WR 40 using archival infrared (IR) observations from WISE and Herschel and radio observations from ATCA. We selected two clumps, free from contamination from material along the line of sight and located towards southern regions in RCW 58, as represe…
Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes
Liao, Shilong; Qi, Zhaoxiang; Tang, Zhenghong +1 more
Gaia data release 2 (DR2) provides the best non-rotating optical frame aligned with the radio frame (ICRF) thanks to the inclusion of about half-million quasars in the five-parameter astrometric solution. We cross-match with Gaia DR2 the quasars from Large Quasar Astrometric Catalogue, Sloan Digital Sky Survey and LAMOST, obtaining 208,743 new sou…
Discovery of Two Infrared Objects with Strong Ice Absorption in the Akari Slitless Spectroscopic Survey of the Galactic Plane
Onaka, Takashi; Sakon, Itsuki; Shimonishi, Takashi +1 more
We discover two infrared objects that show deep absorption features of H2O, CO2, and CO ices in the AKARI/Infrared Camera slitless spectroscopic survey of the Galactic plane in 2.5-13 µm. Both objects are neither located in known star-forming regions nor in known dense clouds. For one of the objects, Object 1, we succes…
The deep and low-mass-ratio contact binary CSS J022914.4+044340 with a luminous additional companion
Liu, Liang; Li, Xu-Zhi
The first B-, V-, Rc- and Ic-band light curves of CSS J022914.4+044340 are presented and analyzed. It is found that CSS J022914.4+044340 is a low mass ratio (0.198 ± 0.005) deep (63.7 ± 7.9%) contact binary, indicating that it is already at the end evolutionary stage of tidally-locked evolution via magnetized wind. Because of…