Search Publications
Einstein rules at a precision of 2 × 10-14
Bergé, Joel; Rodrigues, Manuel; Touboul, Pierre
The MICROSCOPE experiment has set the best upper bound to date on the weak equivalence principle, proving Einstein's postulate with an unprecedented precision, as explained by Principal Investigator Pierre Touboul and team members Manuel Rodrigues and Joel Bergé.
Orbital Characterization of GJ1108A System, and Comparison of Dynamical Mass with Model-derived Mass for Resolved Binaries
Kuzuhara, M.; Tamura, M.; Ishii, M. +55 more
We report an orbital characterization of GJ1108Aab that is a low-mass binary system in the pre-main-sequence phase. Via the combination of astrometry using adaptive optics and radial velocity measurements, an eccentric orbital solution of e = 0.63 is obtained, which might be induced by the Kozai-Lidov mechanism with a widely separated GJ1108B syst…
Spectroscopic and photometric studies of a candidate pulsating star in an eclipsing binary: V948 Her
Kahraman Aliçavuş, Filiz
Eclipsing binary stars with a pulsating component are powerful tools that allow us to probe the stellar interior structure and the evolutionary statuses with a good accuracy. Therefore, in this study, spectroscopic and photometric examinations of an eclipsing binary system V948 Her are presented. The primary component of the system is classified t…
A Six-Dimensional Tomographic View of Galactic Star-Formation
Loinard, L.; Reid, M. J.
Various sign-posts of recent star-formation activity, such as water and methanol maser emission or magnetically active low-mass young stars, can be detected with Very Long Baseline Interferometry (VLBI) radio arrays. The extremely accurate astrometry already attainable with VLBI instruments implies that the trigonometric parallax and the proper mo…
Separated Fringe Packet Observations with the CHARA Array. III. The Very High-eccentricity Binary HR 7345
Farrington, C. D.; Schaefer, G. H.; ten Brummelaar, T. A. +1 more
After an 11-year observing campaign, we present the combined visual-spectroscopic orbit of the formerly unremarkable bright star HR 7345 (HD 181655, HIP 94981, GJ 754.2). Using the Separated Fringe Packet method with the CHARA Array, we were able to determine a difficult-to-complete orbital period of 331.609 ± 0.004 days. The 11-month period cause…
New estimation of non-thermal electron energetics in the giant solar flare on 28 October 2003 based on Mars Odyssey observations
Zimovets, I. V.; Mitrofanov, I. G.; Golovin, D. V. +5 more
A new estimation of the total number and energy of the non-thermal electrons produced in the giant (>X 17) solar flare on 2003 October 28 is presented based on the analysis of the observations of the hard X-ray (HXR) emission by the High Energy Neutron Detector (HEND) onboard the Mars Odyssey spacecraft orbiting Mars. Previous estimations of th…
Solar Sources of Interplanetary Magnetic Clouds Leading to Helicity Prediction
Riley, Pete; Ulrich, Roger K.; Tran, T.
This study identifies the solar origins of magnetic clouds that are observed at 1 AU and predicts the helical handedness of these clouds from the solar surface magnetic fields. We started with the magnetic clouds listed by the Magnetic Field Investigation (MFI) team supporting NASA's Wind spacecraft in what is known as the MFI table and worked bac…
In-situ Star Formation in the Outskirts of the Large Magellanic Cloud: Gaia DR2 Confirmation
Casetti-Dinescu, Dana I.; Girard, Terrence M.; Korchagin, Vladimir I. +5 more
We explore the Gaia data release 2 (DR2) proper motions of six young, main-sequence stars, members of the Large Magellanic Cloud (LMC) reported by Moni Bidin et al. These stars are located in the outskirts of the disk, between 7° and 13° from the LMC’s center where there is very low H I content. Gaia DR2 proper motions confirm that four stars form…
Ten-Year Results of Solar Optical Telescope (SOT) Onboard Hinode
Suematsu, Yoshinori
On the Accuracy of the Conjugation of High-Orbit Satellites with Small-Scale Regions in the Ionosphere
Safargaleev, V. V.; Safargaleeva, N. N.
The degree of uncertainty that arises when mapping high-orbit satellites of the Cluster type into the ionosphere using three geomagnetic field models (T89, T98, and T01) has been estimated. Studies have shown that uncertainty is minimal in situations when a satellite in the daytime is above the equatorial plane of the magnetosphere at the distance…