Search Publications
Micrometeoroid Events in LISA Pathfinder
Mendes, L.; Madden, S.; Russano, G. +121 more
The zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. We present a new set of data obtained from direct measurements of momentum transfer to a spacecraft from individual particle impacts. This te…
CCD UBV photometric and Gaia astrometric study of eight open clusters—ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21
Paunzen, E.; Güver, T.; Bilir, S. +8 more
In this study, we carried out CCD UBV photometry of eight open clusters, ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1, Stock 21, and determined their reddening, metallicity, distance, age, and mass functions. We used new Gaia Data Release 2 (DR2) astrometric data to separate cluster member stars from the field stars a…
The Fluid-like and Kinetic Behavior of Kinetic Alfvén Turbulence in Space Plasma
Verscharen, Daniel; Wicks, Robert T.; Chen, Christopher H. K. +3 more
Kinetic Alfvén waves (KAWs) are the short-wavelength extension of the magnetohydrodynamics Alfvén-wave branch in the case of highly oblique propagation with respect to the background magnetic field. Observations of space plasma show that small-scale turbulence is mainly KAW-like. We apply two theoretical approaches, a collisional two-fluid theory …
Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951
Docobo, J. A.; Hussein, A. M.; Mardini, M. K. +5 more
The precise determination of the physical and dynamical parameters of the HIP 109951 triple star system (WDS J22161-0705AB) which is formed by the A, Ba, and Bb components are presented. The binary nature of component B was recently confirmed by studying the radial velocities. The analysis of the system follows Al-Wardat's complex method for analy…
Thermal balance and comparison of gas and dust properties of dense clumps in the Hi-GAL survey
Rygl, K. L. J.; Elia, D.; Schisano, E. +7 more
We present a comparative study of physical properties derived from gas and dust emission in a sample of 1068 dense Galactic clumps. The sources are selected from the cross-match of the Herschel Infrared Galactic Plane Survey with 16 catalogues of NH3 line emission in its lowest inversion (1,1) and (2,2) transitions. The sample covers a …
Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA
Testa, Paola; Petralia, Antonino; Reale, Fabio +1 more
The Interface Region Imaging Spectrograph (IRIS) has observed bright spots at the transition region footpoints associated with heating in the overlying loops, as observed by coronal imagers. Some of these brightenings show significant blueshifts in the Si IV line at 1402.77 Å ({log}T[{{K}}]≈ 4.9). Such blueshifts cannot be reproduced by coronal lo…
Thermal properties of slowly rotating asteroids: results from a targeted survey
Geier, S.; Pál, A.; Thizy, O. +51 more
Context. Earlier work suggests that slowly rotating asteroids should have higher thermal inertias than faster rotators because the heat wave penetrates deeper into the subsurface. However, thermal inertias have been determined mainly for fast rotators due to selection effects in the available photometry used to obtain shape models required for the…
The Tail of PSR J0002+6216 and the Supernova Remnant CTB 1
Frail, D. A.; Kerr, M.; Schinzel, F. K. +2 more
We have carried out Very Large Array imaging and a Fermi timing analysis of the 115 ms γ-ray and radio pulsar PSR J0002+6216. We found that the pulsar lies at the apex of a narrowly collimated cometary-like 7‧ tail of nonthermal radio emission, which we identify as a bow-shock pulsar wind nebula. The tail of the nebula points back toward the geome…
Distinguishing circumstellar from stellar photometric variability in Eta Carinae
Gull, T. R.; Corcoran, M. F.; Madura, T. I. +14 more
The interacting binary Eta Carinae remains one of the most enigmatic massive stars in our Galaxy despite over four centuries of observations. In this work, its light curve from the ultraviolet to the near-infrared is analysed using spatially resolved HST observations and intense monitoring at the La Plata Observatory, combined with previously publ…
Mid-infrared spectroscopy of planetary analogs: A database for planetary remote sensing
Helbert, Joern; Hiesinger, Harald; Weber, Iris +4 more
The MERTIS (MErcury Radiometer and Thermal Infrared Spectrometer) instrument onboard the ESA/JAXA BepiColombo mission will provide mid-infrared data, which will be crucial to characterize the surface mineralogy of Mercury. In order to interpret the results, we are creating a database of mid-infrared spectra. As part of a study of synthetic glasses…