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The Balloon-Borne Investigation of Temperature and Speed of Electrons in the Corona (BITSE): Mission Description and Preliminary Results
Cho, K. -S.; Kim, Y. -H.; Gopalswamy, N. +16 more
We report on the Balloon-borne Investigation of Temperature and Speed of Electrons in the corona (BITSE) mission launched recently to observe the solar corona from ≈3 Rs to 15 Rs at four wavelengths (393.5, 405.0, 398.7, and 423.4 nm). The BITSE instrument is an externally occulted single stage coronagraph developed at NASA's Goddard Space Flight …
Simultaneous X-ray and radio observations of the transitional millisecond pulsar candidate CXOU J110926.4-650224. The discovery of a variable radio counterpart
Campana, S.; de Martino, D.; Rea, N. +15 more
We present the results of simultaneous observations of the transitional millisecond pulsar (tMSP) candidate
Disentangling the multiphase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z∼0.4
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
The multiphase circumgalactic medium (CGM) arises within the complex environment around a galaxy, or collection of galaxies, and possibly originates from a wide range of physical mechanisms. In this paper, we attempt to disentangle the origins of these multiphase structures and present a detailed analysis of the quasar field Q0122-003 field using …
Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock That Accelerates Electrons
Gopalswamy, Nat; Kumari, Anshu; Patel, Ritesh +4 more
We report on a multi-wavelength analysis of the 26 January 2014 solar eruption involving a coronal mass ejection (CME) and a Type-II radio burst, performed by combining data from various space and ground-based instruments. An increasing standoff distance with height shows the presence of a strong shock, which further manifests itself in the contin…
Imaging Evidence for Solar Wind Outflows Originating from a Coronal Mass Ejection Footpoint
Golub, Leon; Aulanier, Guillaume; Schmieder, Brigitte +2 more
We report on Atmospheric Imaging Assembly observations of plasma outflows originating in a coronal dimming during a 2015 April 28 filament eruption. After the filament started to erupt, two flare ribbons formed, one of which had a well-visible hook enclosing a core (twin) dimming region. Along multiple funnels located in this dimming, a motion of …
The RR Lyrae projected density distribution from the Galactic centre to the halo
Minniti, Dante; Ripepi, Vincenzo; Alonso-García, Javier +4 more
The projected density distribution of type ab RR Lyrae (RRab) stars was characterised from the innermost regions of the Milky Way to the halo, with the aim of placing constraints on the Galaxy's evolution. The compiled sample (NRRab = 64 850) stems from fundamental mode RR Lyrae variables identified by the VVV, OGLE, and Gaia surveys. T…
Galactic Potential and Dark Matter Density from Angular Stellar Accelerations
Buschmann, Malte; Safdi, Benjamin R.; Schutz, Katelin
We present an approach to measure the Milky Way (MW) potential using the angular accelerations of stars in aggregate as measured by astrometric surveys like Gaia. Accelerations directly probe the gradient of the MW potential, as opposed to indirect methods using, e.g., stellar velocities. We show that end-of-mission Gaia stellar acceleration data …
The first photometric and spectroscopic analysis of the extremely low mass-ratio contact binary NSVS 5029961
Li, Kai; Xia, Qi-Qi; Zheng, Shu-Yue
We performed photometric and spectroscopic investigations of NSVS 5029961 for the first time. The new BV(RI)c-band light curves were obtained with the 1.0-m telescope at Weihai Observatory of Shandong University. Applying the Wilson-Devinney program, we found that NSVS 5029961 is an A-subtype shallow contact binary with extremely low ma…
Radio and optical observations of the possible AE Aqr twin, LAMOST J024048.51+195226.9
Knigge, C.; Heywood, I.; Hewitt, D. M. +8 more
It was recently proposed that the cataclysmic variable (CV) LAMOST J024048.51+195226.9 may be a twin to the unique magnetic propeller system AE Aqr. If this is the case, two predictions are that it should display a short period white dwarf spin modulation, and that it should be a bright radio source. We obtained follow-up optical and radio observa…
The TESS View of LOFAR Radio-emitting Stars
Pope, Benjamin J. S.; Günther, Maximilian N.; Ansdell, Megan +4 more
The recent detection of the M dwarf GJ 1151 at 144 MHz low radio frequencies using LOFAR has been interpreted as evidence of an exoplanet magnetically interacting with its host star. This would be the first exoplanet detected around a main-sequence star by a radio telescope. Radial velocity confirmation of such a planet has proven inconclusive and…