Search Publications
MICROSCOPE instrument description and validation
Bergé, Joel; Chhun, Ratana; Métris, Gilles +19 more
This paper focuses on the dedicated accelerometers developed for the MICROSCOPE mission taking into account the specific range of acceleration to be measured on board the satellite. Considering one micro-g and even less as the full range of the instrument with an objective of one femto-g resolution, that leads to a customized concept and a high-pe…
Galactic Mass Estimates Using Dwarf Galaxies as Kinematic Tracers
Eadie, Gwendolyn; Slizewski, Anika; Dufresne, Xander +4 more
New mass estimates and cumulative mass profiles with Bayesian credible regions for the Milky Way (MW) are found using the Galactic Mass Estimator (GME) code and dwarf galaxy (DG) kinematic data from multiple sources. GME takes a hierarchical Bayesian approach to simultaneously estimate the true positions and velocities of the DGs, their velocity a…
Kinematic Structure of the Large Magellanic Cloud Globular Cluster System from Gaia eDR3 and Hubble Space Telescope Proper Motions
van der Marel, Roeland P.; Alfaro-Cuello, Mayte; Watkins, Laura L. +3 more
We have determined bulk proper motions (PMs) for 31 LMC GCs from Gaia eDR3 and Hubble Space Telescope data using multiple independent analysis techniques. Combined with literature values for distances, line-of-sight velocities, and existing bulk PMs, we extract full 6D phase-space information for 32 clusters, allowing us to examine the kinematics …
The Wave Telescope Technique
Glassmeier, K. -H.; Narita, Y.; Motschmann, U.
Unambiguous determination of wavevectors (wavelengths and propagation directions) is one of the major challenges of space plasma observations, since conventional wave analysis methods for the single spacecraft data are limited to the time series data analysis and the wave properties are determined as a function of the frequencies in the spacecraft…
Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B
Weinberger, Alycia J.; De Rosa, Robert J.; Pueyo, Laurent +9 more
Companions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at Hα, an indication that they are actively accreting. We report 5 yr (2013-2018) of monitoring of the position and Hα excess luminosity of the embedded, accreting low-mass stellar companion HD 142527 B from the MagAO/VisAO instr…
Dynamical masses for two M1 + mid-M dwarf binaries monitored during the SPHERE-SHINE survey
Henning, T.; Messina, S.; D'Orazi, V. +25 more
We present orbital fits and dynamical masses for HIP 113201AB and HIP 36985AB, two M1 + mid-M dwarf binary systems monitored as part of the SPHERE-SHINE survey. To robustly determine the age of both systems via gyrochronology, we undertook a photometric monitoring campaign for HIP 113201 and GJ 282AB, the two wide K star companions to HIP 36985, u…
The structure and 3D kinematics of vela OB2
Wright, Nicholas J.; Cantat-Gaudin, Tristan; Jeffries, R. D. +2 more
The kinematics of stars in OB associations can provide insights into their formation, dynamical evolution, and eventual fate. The low-mass stellar content of OB associations are sufficiently numerous as to provide a detailed sampling of their kinematic properties, however spectroscopy is required to confirm the youth of individual stars and to get…
Gaia 20eae: A Newly Discovered Episodically Accreting Young Star
Mahadevan, Suvrath; Wisniewski, John P.; Pandey, Rakesh +18 more
The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a ~4.25 magnitude outburst. We present multiwavelength photometric and spectroscopic follow-up observations of this source since 2020 August and identify it as the newest member of the FUor/EXor family of sources. We find that the present brightening…
Probing red supergiant dynamics through photo-center displacements measured by Gaia
Chiavassa, A.; de Mink, S. E.; Davies, B. +2 more
Context. Red supergiant (RSGs) are cool massive stars in a late phase of their evolution when the stellar envelope becomes fully convective. They are the brightest stars in the universe at infrared light and can be detected in galaxies far beyond the Local Group, allowing for accurate determination of chemical composition of galaxies. The study of…
A fast radio burst progenitor born in a galaxy merger
Prochaska, J. Xavier; Kanekar, Nissim; Kaur, Balpreet
We report a Giant Metrewave Radio Telescope HI 21cm mapping study of the neutral atomic hydrogen (HI) in the host galaxy of the fast radio burst (FRB) FRB20180916B at z ≈ 0.03399. We find that the FRB host has an HI mass of MHI = (2.74 ± 0.33) × 109 M⊙ and a high HI-to-stellar mass ratio, ≈ 1.3. The FRB host is thu…