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Disturbed Flows in the Inner Solar Wind and Near Earth's Orbit
Pätzold, M.; Bird, M. K.; Efimov, A. I. +3 more
Coronal mass ejections from active regions on the Sun can be observed as series of individual events separated in time in the inner solar wind and near-Earth plasma. To find such events we have analyzed experimental data of dual-frequency solar wind radio sounding by the Rosetta and Mars Express spacecraft. The cycles of experiments performed in 2…
A white dwarf bound to the transiting planetary system WASP-98
Gänsicke, Boris T.; Močnik, Teo; Tremblay, Pier-Emmanuel +2 more
WASP-98 is a planetary system containing a hot Jupiter transiting a late-G dwarf. A fainter star, 12 arcsec away, has previously been identified as a white dwarf, with a distance and proper motion consistent with a physical association with the planetary system. We present spectroscopy of the white dwarf, with the aim of determining its mass, radi…
A search for pulsars in subdwarf B binary systems and discovery of giant-pulse emitting PSR J0533-4524
Ishwara-Chandra, C. H.; van Leeuwen, J.; Coenen, T. +2 more
Binary millisecond pulsars (MSPs) provide several opportunities for research of fundamental physics. However, finding them can be challenging. Several subdwarf B (sdB) binary systems with possible neutron star companions have been identified, allowing us to perform a targeted search for MSPs within these systems. Six sdBs with companions in the ne…
Simple, compact, high-resolution monochromatic x-ray source for characterization of x-ray calorimeter arrays
Eckart, M. E.; Kilbourne, C. A.; Leutenegger, M. A. +6 more
X-ray calorimeters routinely achieve very high spectral resolution, typically a few eV full width at half maximum (FWHM). Measurements of calorimeter line shapes are usually dominated by the natural linewidth of most laboratory calibration sources. This compounds the data acquisition time necessary to statistically sample the instrumental line bro…
A Generic Pushbroom Sensor Model for Planetary Photogrammetry
Geng, Xun; Xu, Qing; Lan, Chaozhen +1 more
Different imaging instruments are designed in the planetary exploration missions, which require respective photogrammetric software modules to support the geometric processing of planetary remote sensing images. To decrease the cost of software development and maintenance, this paper presents a generic pushbroom sensor model for planetary photogra…
The origin of globular cluster FSR 1758
Korchagin, Vladimir I.; Carraro, Giovanni; Ortolani, Sergio +2 more
Context. Globular clusters in the Milky Way are thought to have either an in situ origin, or to have been deposited in the Galaxy by past accretion events, like the spectacular Sagittarius dwarf galaxy merger.
Aims: We probe the origin of the recently discovered globular cluster FSR 1758, often associated with some past merger event and which…
Searching for Balmer-dominated Type Ia Supernova Remnants in M33
Chu, You-Hua; Li, Chuan-Jui; Lin, Chris Ding-Jyun +1 more
We searched for Balmer-dominated Type Ia supernova remnants (SNRs) in M33 by selecting thermal X-ray sources with ${L}_{{\rm{X}}}\geqslant 5\times {10}^{35}$ erg s-1, identifying associated Hα emission features, and checking their [S II] and [O III] emission properties. Our search did not find any Balmer-dominated Type Ia SNRs in M33. T…
The excitation temperature of the CH 3335-MHz line
Reach, William T.; Andersson, B. -G.; Dailey, Erin M. +2 more
Molecular hydrogen is the main constituent of dense molecular clouds, but is expected to also be a dominant constituent in many environments where CO can no longer be seen, the so-called 'CO-dark molecular gas'. Based on comparisons of ultraviolet spectroscopy of H2 and optical line observations (4300 Å), CH is a prime candidate to trac…
Dependence of the Interplanetary Magnetic Field on Heliocentric Distance at 0.3-1.7 AU: A Six-Spacecraft Study
Hanneson, Cedar; Johnson, Catherine L.; Mittelholz, Anna +2 more
We use magnetometer data taken simultaneously by MESSENGER, VEX, STEREO and ACE to characterize the variation of the interplanetary magnetic field (IMF) with heliocentric distance, rh, for rh≲ 1 AU. Power law fits (a rh b) to the individual IMF components and magnitude indicate that, on average, the IMF is more tightly wound and its strength decre…
Eclipse timing variation of GK Vir: evidence of a possible Jupiter-like planet in a circumbinary orbit
Almeida, L. A.; Pereira, E. S.; Borges, G. M. +3 more
Eclipse timing variation analysis has become a powerful method to discover planets around binary systems. We applied this technique to investigate the eclipse times of GK Vir. This system is a post-common envelope binary with an orbital period of 8.26 h. Here, we present 10 new eclipse times obtained between 2013 and 2020. We calculated the O-C di…