Search Publications
Missions
Journals
Publication Years
Statistical properties of Hipparcos 2, caveats on its use, and a recalibration of the intermediate astrometric data
Brandt, Timothy D.; Brandt, G. Mirek; Michalik, Daniel
We revisit the Hipparcos 2007 re-reduction and find improvements to the catalogue by leveraging Gaia EDR3. We show that including a constant residual offset and additional dispersion (two free parameters in total) in the Hipparcos 2007 Intermediate Astrometric Data (IAD) creates a new catalogue with significantly better agreement with Gaia EDR3. T…
Backscattering and Line Broadening in Orion
O'Dell, C. R.; Ferland, G. J.; Méndez-Delgado, J. E.
Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region. This scattered light component has a weak wavelength dependence that is consistent with either general…
The brightness of the CO Cameron bands in the martian discrete aurora: A study based on revised cross sections
Daerden, F.; Neary, L.; Gérard, J. -C. +2 more
We analyze the consequences of the new laboratory measurements of the emissions cross sections of the Cameron bands excited by electron impact on CO2 and CO in the Mars aurora. We use Monte Carlo simulations to investigate the importance of these changes and their dependence on the initial electron energy. The Mars Climate Database (MCD…
Spectroscopic and photometric study of the pulsating eclipsing binary HIP 28271
Chen, Tao; Wang, Kun; Cao, Xingmei
We report the results of the detailed study of the single-lined eclipsing binary HIP 28271 with time-series high-resolution spectra and high-precision TESS photometry. The binary modeling indicates that HIP 28271 has a short orbital period of 2.7404254-4e-7+9e-7 days, with an eccentricity ofeorb = 0.0062-0.001…
3D ray tracing solver for communication blackout analysis in atmospheric entry missions
Poedts, Stefaan; Giangaspero, Vincent F.; Sharma, Vatsalya +4 more
During the atmospheric entry phase at hypersonic speed, the radio communication from/to a space vehicle can be disrupted due to the formation of a plasma sheath within the surrounding flow field. In order to characterize such communication blackout phases, this work presents a numerical methodology combining Computational Fluid Dynamic (CFD) simul…
Timing analysis of Swift J0243.6+6124 with NICER and Fermi/GBM during the decay phase of the 2017-2018 outburst
Santangelo, A.; Serim, M. M.; Baykal, A. +3 more
We present a timing and noise analysis of the Be/X-ray binary system Swift J0243.6+6124 during its 2017-2018 super-Eddington outburst using NICER/XTI observations. We apply a synthetic pulse timing analysis to enrich the Fermi/GBM spin frequency history of the source with the new measurements from NICER/XTI. We show that the pulse profiles switch …
A' view of the sunrise: boosting helioscopes with angular information
Frerick, Jonas; Kahlhoefer, Felix; Schmidt-Hoberg, Kai
The Sun may copiously produce hypothetical light particles such as axions or dark photons, a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the impact of the angular and spectral distribution of solar dark photons on the sensitivity of such instruments. For the first time we evaluate this spectral and a…
Determining the orbital parameters of binary systems with an AGB primary. The case of the R Aqr symbiotic system
Alcolea, J.; Bachiller, R.; Santander-García, M. +6 more
Binary stars including an AGB star hold the clues for understanding important phenomena in stellar evolution, such as common-envelope events, the formation of SN-Ia, and the origin of aspherical pPNe/PNe. Hydro-dynamical codes simulating the companion's influence on the primary mass loss exist, but we still lack information on the orbital paramete…
The multichord stellar occultation by the centaur Bienor on January 11, 2019
Colas, F.; Mottola, S.; Souami, D. +42 more
Within our program of physical characterization of trans-Neptunian objects and centaurs, we predicted a stellar occultation by the centaur (54598) Bienor to occur on January 11, 2019, with good observability potential. We obtained high accuracy astrometric data to refine the prediction, resulting in a shadow path favorable for the Iberian Peninsul…
A Hunting Expedition For High-Order Hierarchies
Kostov, Veselin B.; Powell, Brian P.; Tokovinin, Andrei
Stellar hierarchical systems of high order containing more than three stars are rare and fascinating objects; their discovery and study highlight still unknown aspects of star formation and early evolution. We matched eclipsing binaries discovered by Transiting Exoplanet Survey Satellite with a Gaia catalogue of wide binaries and selected candidat…