Search Publications
Temperature stability in the sub-milliHertz band with LISA Pathfinder
Mendes, L.; Russano, G.; Lloro, I. +79 more
LISA Pathfinder (LPF) was a technology pioneering mission designed to test key technologies required for gravitational wave detection in space. In the low frequency regime (milliHertz and below), where space-based gravitational wave observatories will operate, temperature fluctuations play a crucial role since they can couple into the interferomet…
CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy
Soria, Roberto; Liu, Jifeng; Walton, Dominic J. +7 more
We investigated the time-variability and spectral properties of the eclipsing X-ray source Circinus Galaxy X-1 (GG X-1), using Chandra, XMM-Newton and ROSAT. We phase-connected the light curves observed over 20 yr, and we obtained a best-fitting period P = (25,970.0 ± 0.1) s ≈ 7.2 hr, and a period derivative \dot{P}/P=(10.2+/- 4.6)× {10}-7
Multi-wavelength variability of the young solar analog ι Horologii. X-ray cycle, star spots, flares, and UV emission
Sanz-Forcada, J.; Stelzer, B.; Raetz, S. +2 more
Context. Chromospheric activity cycles are common in late-type stars; however, only a handful of coronal activity cycles have been discovered. ι Hor is the most active and youngest star with known coronal cycles. It is also a young solar analog, and we are likely facing the earliest cycles in the evolution of solar-like stars, at an age ( 600 Myr)…
Using ALMA to resolve the nature of the early star-forming large-scale structure PLCK G073.4-57.5
Frye, Brenda; Hill, Ryley; Béthermin, Matthieu +10 more
Galaxy clusters at high redshift are key targets for understanding matter assembly in the early Universe, yet they are challenging to locate. A sample of more than 2000 high-z candidate structures has been found using Planck's all-sky submillimetre maps, and a sub-set of 234 have been followed up with Herschel-SPIRE, which showed that the emission…
Single-spacecraft Identification of Flux Tubes and Current Sheets in the Solar Wind
Servidio, Sergio; Pecora, Francesco; Greco, Antonella +3 more
A novel technique is presented for describing and visualizing the local topology of the magnetic field using single-spacecraft data in the solar wind. The approach merges two established techniques: the Grad-Shafranov (GS) reconstruction method, which provides a plausible regional two-dimensional magnetic field surrounding the spacecraft trajector…
Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr
Gazeas, Kosmas; Bowman, Dominic M.; Ricker, George R. +21 more
We report an analysis of the first known β Cep pulsator observed by the Transiting Exoplanet Survey Satellite (TESS) mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly periodic pulsator, has at least 34 oscillation modes excited, 12 of those in the g-mode domain and 22 p modes. Analysis of archival data implies that…
Multi-point galactic cosmic ray measurements between 1 and 4.5 AU over a full solar cycle
Guo, Jingnan; Heber, Bernd; Kuulkers, Erik +6 more
The radiation data collected by the Standard Radiation Environment Monitor (SREM) aboard ESA missions INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), Rosetta, Herschel, Planck and Proba-1, and by the high-energy neutron detector (HEND) instrument aboard Mars Odyssey, are analysed with an emphasis on characterising galactic cosmic rays …
Wide binary companions to massive stars and their use in constraining natal kicks
Igoshev, Andrei P.; Perets, Hagai B.
The origin of ultrawide massive binaries (orbital separations 103-2 × 105 au) and their properties are neither well characterized nor understood. Here we use the second Gaia data release to search for wide astrometric companions to Galactic O-B5 stars which share similar parallax and proper motion with the primaries. Using th…
Calibration of the mixing-length theory for structures of helium-dominated atmosphere white dwarfs
Ludwig, H. -G.; Fontaine, G.; Tremblay, P. -E. +5 more
We perform a calibration of the mixing-length parameter at the bottom boundary of the convection zone for helium-dominated atmospheres of white dwarfs. This calibration is based on a grid of 3D DB (pure-helium) and DBA (helium-dominated with traces of hydrogen) model atmospheres computed with the CO5BOLD radiation-hydrodynamics code, and a grid of…
Deep ATCA and VLA Radio Observations of Short-GRB Host Galaxies. Constraints on Star Formation Rates, Afterglow Flux, and Kilonova Radio Flares
Palazzi, E.; Greiner, J.; Hunt, L. K. +6 more
We report the results of an extensive radio-continuum observing campaign of host galaxies of short gamma-ray bursts (GRBs). The goal of this survey was to search for optically obscured star formation, possibly indicative of a population of young short-GRB progenitors. Our sample comprises the hosts and host-galaxy candidates of 16 short-GRBs from …