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A Robust Ground-to-Image Transformation Algorithm and Its Applications in the Geometric Processing of Linear Pushbroom Images
Geng, Xun; Xu, Qing; Lan, Chaozhen +1 more
Linear array cameras are widely used in the fields of aerial and space remote sensing. The ground-to-image transformation plays a significant role in the geometric processing procedures of linear pushbroom images, which is time-consuming due to multiple iterative calculations. Moreover, the detectors of the linear array may exhibit a curved shape …
Fine-structure constant constraints on late-time dark energy transitions
Martins, C. J. A. P.; Prat Colomer, M.
We use recent astrophysical and local tests of the stability of the fine-structure constant, α, to constrain a particular phenomenological but physically motivated class of models in which the dark energy equation of state can undergo a rapid transition at low redshifts, perhaps associated with the onset of the acceleration phase. We set constrain…
Quest for the tertiary component in Cyg OB2 #5
Nazé, Yaël; Rauw, Gregor; Campos, Fran
Aims: The Cyg OB2 #5 system is thought to consist of a short-period (6.6 d) eclipsing massive binary orbited by an OB-star with a period of 6.7 yr; these stars in turn are orbited by a distant early B-star with a period of thousands of years. However, while the inner binary has been studied many times, information is missing on the other star…
Onset of a CME-Related Shock Within the Large-Angle Spectrometric Coronagraph (LASCO) Field of View
Fainshtein, V. G.; Egorov, Y. I.
We investigated the onset of a CME-related shock within the Large-Angle Spectrometric Coronagraph (LASCO) field of view (FOV). To detect the first moment of the shock onset, we found a CME on 17 July 2012 that formed at a relatively high altitude and moved with slow acceleration. We examined the possible mechanisms of shock generation. It was show…
Inflowing gas in the central parsec of M81
Devereux, Nick
Spectroscopic observations of the Seyfert 1/Liner nucleus of M81, obtained recently with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope(HST), have revealed an ultraviolet (UV)-visible spectrum rich with emission lines of a variety of widths, ionization potentials, and critical densities, including several in the UV that…
Spitzer Space Telescope observations of bilobate comet 8P/Tuttle
Jorda, L.; Lamy, P. L.; Groussin, O. +4 more
Context. Comet 8P/Tuttle is a nearly isotropic comet whose physical properties are poorly known and might be different from those of ecliptic comets owing to their different origin. Two independent observations have shown that 8P/Tuttle has a bilobate nucleus.
Aims: Our goal is to determine the physical properties of the nucleus (size, shape,…
Maps of Tethys' thermophysical properties
Spencer, J. R.; Howett, C. J. A.; Segura, M. +2 more
On 11th April 2015 Cassini's Composite Infrared Spectrometer (CIRS) made a series of observations of Tethys' daytime anti-Saturn hemisphere over a nine-hour time period. During this time the sub-spacecraft position was remarkably stable (0.3° S to 3.9° S; 153.2° W to 221.8° W), and so these observations provide unprecedented coverage of diurnal te…
The Broadband X-Ray Spectrum of the X-Ray-obscured Type 1 AGN 2MASX J193013.80+341049.5
Walton, Dominic J.; Stern, Daniel; Assef, Roberto J. +6 more
We present results from modeling the broadband X-ray spectrum of the Type 1 active galactic nucleus (AGN) 2MASX J193013.80+341049.5 using NuSTAR, Swift, and archival XMM-Newton observations. We find this source to be highly X-ray obscured, with column densities exceeding 1023 cm-2 across all epochs of X-ray observations, span…
Searching for Wide Companions and Identifying Circum(sub)stellar Disks through PSF Fitting of Spitzer/IRAC Archival Images
Kraus, Adam L.; Martinez, Raquel A.
Direct imaging surveys have discovered wide-orbit planetary-mass companions that challenge existing models of both star and planet formation, but their demographics remain poorly sampled. We have developed an automated binary companion point-spread function (PSF) fitting pipeline to take advantage of Spitzer's infrared sensitivity to planetary-mas…
Third-nearest WZ Sge-Type dwarf nova candidate ASASSN-14dx classified on the basis of Gaia Data Release 2
Nogami, Daisaku; Monard, Berto; Ohshima, Tomohito +8 more
ASASSN-14dx showed an extraordinary outburst whose features are a small outburst amplitude (∼2.3 mag) and long duration (>4 yr). Because we found a long observational gap of 123 d before the outburst detection, we propose that the main outburst plateau was missed and that this outburst is just a "fading tail" often seen after the WZ Sge-type su…