Search Publications
Spacecraft Radio Frequency Fluctuations in the Solar Corona: A MESSENGER-HELIOS Composite Study
Wexler, David B.; Hollweg, Joseph V.; Jensen, Elizabeth A. +4 more
Fluctuations in plasma electron density may play a role in solar coronal energy transport and the dissipation of wave energy. Transcoronal spacecraft radio sounding observations reveal frequency fluctuations (FFs) that encode the electron number density disturbances, allowing an exploration of the coronal compressive wave and advected inhomogeneit…
Flare and Warp of Galactic Disk with OB Stars from Gaia DR2
Zhao, Gang; Li, Chengdong; Yang, Chengqun +3 more
The OB stars are selected from the Gaia DR2 catalog to explore the flare and warp of the Galactic disk in this work. The Gaia and 2MASS photometric information is adopted as the criteria to choose the sample stars. We model the Galactic disk stellar distribution in this work taking the flare and warp into consideration. The parameters in the flare…
Discovery of a very young high-mass X-ray binary associated with the supernova remnant MCSNR J0513-6724 in the LMC
Haberl, F.; Soszyński, I.; Udalski, A. +20 more
We report the discovery of a very young high-mass X-ray binary (HMXB) system associated with the supernova remnant (SNR) MCSNR J0513-6724 in the Large Magellanic Cloud (LMC), using XMM-Newton X-ray observations. The HMXB is located at the geometrical centre of extended soft X-ray emission, which we confirm as an SNR. The HMXB spectrum is consisten…
Statistical Study on Multispacecraft Widespread Solar Energetic Particle Events During Solar Cycle 24
St. Cyr, O. C.; Gopalswamy, N.; Mäkelä, P. +1 more
We conduct a statistical study on the large three-spacecraft widespread solar energetic particle (SEP) events. Longitudinal distributions of the peak intensities, onset delays, and relation between the SEP intensity, coronal mass ejection (CME) shock speed, width, and the kinetic energy of the CME have been investigated. We apply a Gaussian fit to…
An Extremely Low-mass He White Dwarf Orbiting the Millisecond Pulsar J1342+2822B in the Globular Cluster M3
Ferraro, F. R.; Lanzoni, B.; Pallanca, C. +3 more
We report on the discovery of the companion star to the millisecond pulsar J1342+2822B in the globular cluster M3. We exploited a combination of near-ultraviolet and optical observations acquired with the Hubble Space Telescope in order to search for the optical counterparts to the known millisecond pulsars in this cluster. At a position in excell…
[C I](1-0) and [C I](2-1) in Resolved Local Galaxies
Hunt, Leslie K.; Wilson, Christine D.; Rosolowsky, Erik +16 more
We present resolved [C I] line intensities of 18 nearby galaxies observed with the SPIRE FTS spectrometer on the Herschel Space Observatory. We use these data along with resolved CO line intensities from J up = 1 to 7 to interpret what phase of the interstellar medium the [C I] lines trace within typical local galaxies. A tight, linear …
The Araucaria project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry
Weber, M.; Kervella, P.; Tkachenko, A. +9 more
Context. The precise determinations of stellar mass at ≲1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release.
Aims: We measured the masses and distance of binary systems with a precision level better than 1% using a fully geometrica…
Fractal statistics in young star clusters: structural parameters and dynamical evolution
Hetem, Annibal; Gregorio-Hetem, Jane
We used fractal statistics to quantify the degree of observed substructures in a sample of 50 embedded clusters and more evolved open clusters (< 100 Myr) found in different galactic regions. The observed fractal parameters were compared with N-body simulations from the literature, which reproduce star-forming regions under different initial co…
The evolution of carbon-polluted white dwarfs at low effective temperatures
Blouin, Simon; Dufour, Patrick
Taking advantage of the Gaia Data Release 2, recent studies have revisited the evolution of carbon-polluted white dwarfs (DQs) across a large range of effective temperatures. These analyses have clearly confirmed the existence of two distinct DQ evolutionary sequences: one with normal-mass white dwarfs and one with heavily polluted and generally m…
The angular momentum of disc galaxies at z = 1
Fraternali, F.; Di Teodoro, E. M.; Oosterloo, T. +3 more
We investigate the relation between stellar mass (M⋆) and specific stellar angular momentum (j⋆), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at z ∼ 1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determin…