Search Publications
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…
Binary Star Population with Common Proper Motion in Gaia DR2
Kovaleva, D. A.; Malkov, O. Yu.; Sapozhnikov, S. A. +1 more
<sec id="ASec1"><title>Abstract—We describe a homogeneous catalog compilation of common proper motion stars based on Gaia DR2. A preliminary list of all pairs of stars within the radius of 100 pc around the Sun with a separation less than a parsec was compiled. Also, a subset of comoving pairs, wide binary stars, was selected. The clus…
Benford's law in the Gaia universe
de Bruijne, Jos; de Jong, Jurjen; De Ridder, Joris
Context. Benford's law states that for scale- and base-invariant data sets covering a wide dynamic range, the distribution of the first significant digit is biased towards low values. This has been shown to be true for wildly different datasets, including financial, geographical, and atomic data. In astronomy, earlier work showed that Benford's la…
The H I Structure of the Local Volume Dwarf Galaxy Pisces A
Peek, J. E. G.; Putman, Mary E.; Tollerud, Erik J. +2 more
Dedicated H I surveys have recently led to a growing category of low-mass galaxies found in the Local Volume. We present synthesis imaging of one such galaxy, Pisces A, a low-mass dwarf originally confirmed via optical imaging and spectroscopy of neutral hydrogen (H I) sources in the Galactic Arecibo L-band Feed Array H I survey. Using H I observa…
Testing the Cosmic Distance Duality Relation with the Latest Strong Gravitational Lensing and Type Ia Supernovae
Xia, Jun-Qing; Lyu, Meng-Zhen; Li, Zheng-Xiang
We perform a model-independent and comprehensive test on the cosmic distance duality relation (CDDR) by combining the latest observations of strong gravitational lensing (SGL) including a total of 161 well-measured systems from several surveys and observations of Type Ia supernovae (SNe Ia), I.e., the joint light-curve analysis of SNe Ia and the P…