Search Publications
Wolf 503 b: Characterization of a Sub-Neptune Orbiting a Metal-poor K Dwarf
Butler, R. Paul; Gorjian, Varoujan; López-Morales, Mercedes +35 more
Using radial-velocity measurements from four instruments, we report the mass and density of a 2.043 ±0.069 R ⊕ sub-Neptune orbiting the quiet K-dwarf Wolf 503 (HIP 67285). In addition, we present improved orbital and transit parameters by analyzing previously unused short-cadence K2 campaign 17 photometry and conduct a joint radial-velo…
Thermodynamics of the Magnetotail Current Sheet Thinning
Petrukovich, A. A.; Nakamura, R.; Artemyev, A. V. +1 more
Substorm growth phase in the magnetotail is characterized by formation of a thin current sheet (CS) becomes unstable due to external or internal drivers. Such instability results in magnetic field line reconnection, the substorm onset. The CS thinning, as a key process of substorm dynamics, has been included into many global and local simulations …
A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752
Anderson, Jay; Strader, Jay; Heinke, Craig O. +6 more
We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combined new and archival Chandra imaging to detect 51 X-ray sources (12 of which are new) within the 1.9 arcmin half-light radius. Three radio sources in deep ATCA 5 and 9 GHz…
The Mass and Age Distribution of Halo White Dwarfs in the Canada-France Imaging Survey
Gwyn, Stephen D. J.; McConnachie, Alan W.; Cuillandre, Jean-Charles +6 more
We present optical spectroscopy for 18 halo white dwarfs identified using photometry from the Canada-France Imaging Survey and Pan-STARRS1 DR1 3π survey combined with astrometry from Gaia DR2. The sample contains 13 DA, 1 DZ, 2 DC, and 2 potentially exotic types of white dwarf. We fit both the spectrum and the spectral energy distribution in order…
Deriving the bulk properties of solar wind electrons observed by Solar Orbiter. A preliminary study of electron plasma thermodynamics
Lewis, G. R.; Kataria, D. O.; Owen, C. J. +8 more
Context. We demonstrate the calculation of solar wind electron bulk parameters based on recent observations by Solar Wind Analyser - Electron Analyser System on board Solar Orbiter. We use our methods to derive the electron bulk parameters in a time interval spanning several hours. We attempt a preliminary examination of the polytropic behavior of…
2019 International Women's Day event. Two-step solar flare with multiple eruptive signatures and low Earth impact
Magdalenić, J.; Temmer, M.; Veronig, A. M. +7 more
Context. We present a detailed analysis of an eruptive event that occurred on 2019 March 8 in the active region AR 12734, which we refer as the International Women's Day event. The event under study is intriguing based on several aspects: (1) low-coronal eruptive signatures come in `pairs', namely, there is a double-peaked flare, two coronal dimmi…
The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey. III. The Perseus-Pisces supercluster and the Southern Great Wall as traced by X-ray luminous galaxy clusters
Böhringer, Hans; Chon, Gayoung; Trümper, Joachim
The Perseus-Pisces supercluster is known as one of the largest structures in the nearby Universe that has been charted by the galaxy and galaxy cluster distributions. For the latter mostly clusters from the Abell catalogue have been used. Here we take a new approach to a quantitative characterisation of the Perseus-Pisces supercluster using a stat…
The QuaStar Survey: Detecting Hidden Low-velocity Gas in the Milky Way's Circumgalactic Medium
Werk, Jessica K.; Zheng, Yong; Peek, Joshua +2 more
From our position embedded within the Milky Way's interstellar medium, we have limited ability to detect gas at low relative velocities in the extended Galactic halo because those spectral lines are blended with much stronger signals from dense foreground gas. As a result, the content of the Milky Way's circumgalactic medium (CGM) is poorly constr…
The Spacecraft Wake: Interference With Electric Field Observations and a Possibility to Detect Cold Ions
Eriksson, Anders I.; Khotyaintsev, Yuri V.; André, Mats +1 more
Wakes behind spacecraft caused by supersonic drifting positive ions are common in plasmas and disturb in situ measurements. We review the impact of wakes on observations by the Electric Field and Wave double-probe instruments on the Cluster satellites. In the solar wind, the equivalent spacecraft charging is small compared to the ion drift energy …
Revealing a New Black Widow Binary 4FGL J0336.0+7502
Kong, Albert K. H.; Li, Kwan-Lok; Jane Yap, Y. X. +1 more
We report on the discovery of a promising candidate for a black widow (BW) millisecond pulsar binary, 4FGL J0336.0+7502, which shows many pulsar-like properties in the 4FGL-DR2 catalog. Within the 95% error region of the LAT source, we identified an optical counterpart with a clear periodicity at Porb = 3.718178(9) hr using the Bohyunsa…