Search Publications
Study of eclipsing binary and multiple systems in OB associations V: MQ Cen in Crux OB1
Bakış, Volkan; Bilir, Selçuk; Nitschelm, Christian +6 more
The early-type massive binary MQ Cen (
Mars methane hunt comes up empty, flummoxing scientists
Witze, Alexandra
Trace Gas Orbiter spacecraft did not find the gas in red planet's atmosphere during its first months of operation.
Open cluster candidates in the VVVX area: VVVX CL 076 and CL 077
Minniti, D.; Chené, A. -N.; Borissova, J. +6 more
We are reporting some basic parameters of two newly discovered clusters, VVVX CL076 and CL077, recently discovered in the galactic disk area covered by the VISTA Variables in the Via Lactea eXtended (VVVX) ESO Public Survey. The preliminary analysis shows that both clusters are young and relatively close to the Sun.
No Pulsar Wind Nebula in the Southern Blowout Region of the Cygnus Loop
Gotthelf, E. V.; Halpern, J. P.
We report on optical observations of the Katsuda et al. candidate X-ray pulsar and pulsar wind nebula in the Cygnus Loop supernova remnant. We determine that the point source suggested to be a pulsar is actually the nucleus of a Seyfert 1 galaxy at redshift z = 0.2080, while the diffuse X-ray source, which is displaced by 2.‧6 from the point sourc…
The Modulating Optical Depth of the Photoelectric Absorption Edge with a Pulse Phase in Accretion-powered X-Ray Pulsars
Kitamoto, Shunji; Yoshida, Yuki
We report the first discovery of a pulse phase modulating optical depths at the iron K-edge in accretion-powered X-ray pulsars from Suzaku observations. A significant modulating optical depth of the iron K-edge is detected for Vela X-1 and GX 1+4. Similar trends are seen in GX 301-2 and OAO 1657-415, though with poor statistical significance. The …
Finding the Normal Direction of Interplanetary Directional Discontinuities—A New Scheme
Wu, D. J.; Yang, L.; Yang, Y. -H. +2 more
Directional discontinuities (DDs) are common structures in the interplanetary space. Correctly determining the normal of a DD is important to understand the changes of phase fronts of magnetic fields adjacent to a discontinuity as well as helpful for the applications in many regimes of space physics research. In this work, we propose a new scheme …
Radial Velocities of Low-mass Candidate TWA Members
Mace, Gregory; Sokal, Kimberly; Kidder, Benjamin +2 more
Nearby young moving groups provide unique samples of similar age stars for testing the evolution of physical properties. Incomplete and/or incorrect group membership classifications reduce the usefulness of the group, which we assume to be coeval. With near-infrared spectra of two candidate members of the TW Hya Association, 2MASS J12354615-411553…
Simultaneous Kepler/K2 and XMM‑Newton observations of superflares in the Pleiades
Antoniou, V.; Micela, G.; Stauffer, J. +9 more
Together with coronal mass ejection, flares are the most energetic stellar magnetic events, ignited by a sudden release of magnetic energy, which triggers a cascade of interconnected phenomena, each resulting in emission in different bands. For this reason, flares are intrinsic multiwavelength phenomena. In particular, optical and soft X‑ray emiss…
Probing the Hill Sphere of (486958) 2014 MU69. II. Hubble Space Telescope Fine Guidance Sensors Observations during the 2018 August 4 Stellar Occultation
Stern, S. Alan; Spencer, John R.; Buie, Marc W. +6 more
We observed the 2018 August 4 stellar occultation by the Kuiper Belt object (486958) 2014 MU69, the first close flyby target of the extended New Horizons mission. Rather than capture a solid-body occultation by the KBO itself, our program aimed to constrain the opacity of rings, moons, or other debris in the nearby environment. We used …
Detection of Crystalline and Fine-grained Calcic Plagioclases on Vesta
Aoki, S.; Oliva, F.; D'Aversa, E. +8 more
Plagioclase feldspars are among the most prevalent minerals in the solar system, and are present in many chondritic and achondritic meteorite families. Nevertheless, spectral features of plagioclases have never been unambiguously and directly observed in remote observations of asteroids. We report here the detection of an absorption band at 12.2 &…