Search Publications
Ozone vertical distribution in Mars Years 27-30 from SPICAM/MEX UV occultations
Montmessin, F.; Fedorova, A.; Korablev, O. +5 more
The SPICAM/MEX ultraviolet spectrometer probed the Martian atmosphere with the occultation method from 2004 until 2014. SPICAM/MEX performed both stellar and solar occultations during in total four Martian Years with good spatial and seasonal coverages. We have analyzed these occultations and performed a rigorous quality check of the retrievals to…
Finite-resolution Deconvolution of Multiwavelength Imaging of 20,000 Galaxies in the COSMOS Field: The Evolution of Clumpy Galaxies over Cosmic Time
Muzzin, Adam; Marchesini, Danilo; Stefanon, Mauro +5 more
Compact star-forming clumps observed in distant galaxies are often suggested to play a crucial role in galaxy assembly. In this paper, we use a novel approach of applying finite-resolution deconvolution on ground-based images of the COSMOS field to resolve 20,185 star-forming galaxies (SFGs) at 0.5 < z < 2 to an angular resolution of 0.″3 an…
SEAGLE - III: Towards resolving the mismatch in the dark-matter fraction in early-type galaxies between simulations and observations
Schaye, Joop; Koopmans, Léon V. E.; Schaller, Matthieu +4 more
The central dark-matter fraction of galaxies is sensitive to feedback processes during galaxy formation. Strong gravitational lensing has been effective in the precise measurement of the dark-matter fraction inside massive early-type galaxies. Here, we compare the projected dark-matter fraction of early-type galaxies inferred from the SLACS (Sloan…
Solar Energetic Particles: Spatial Extent and Implications of the H and He Abundances
Reames, Donald V.
One of the earliest indicators of the importance of shock acceleration of solar energetic particles (SEPs) was the broad spatial extent of the "gradual" SEP events produced as the shock waves, driven by wide, fast coronal mass ejections (CMEs), expand across the Sun with cross-field transport mediated by the shocks. Contrasting "impulsive" SEP eve…
Zero-phase angle asteroid taxonomy classification using unsupervised machine learning algorithms
Alvarez-Candal, A.; Duffard, R.; Colazo, M.
Context. We are in an era of large catalogs and, thus, statistical analysis tools for large data sets, such as machine learning, play a fundamental role. One example of such a survey is the Sloan Moving Object Catalog (MOC), which lists the astrometric and photometric information of all moving objects captured by the Sloan field of view. One great…
The massive system V375 Cassiopeia is a semidetached mass-transfer binary with a massive stellar companion
Zhang, J.; Qian, S. -B.; Liao, W. -P. +3 more
V375 Cassiopeia (V375 Cas) is an early B-type close binary with an orbital period of 1.4734273 d. Based on high-quality and continuous light curves from the Transiting Exoplanet Survey Satellite (TESS) and new low-resolution spectra, we have determined photometric solutions of the eclipsing binary using the Wilson-Devinney method. We have found th…
A Monte Carlo Method for Evaluating Empirical Gyrochronology Models and Its Application to Wide Binary Benchmarks
Buzasi, Derek; Oswalt, T. D.; von Hippel, Ted +3 more
Accurate stellar ages are essential for our understanding of the star formation history of the Milky Way and Galactic chemical evolution, as well as to constrain exoplanet formation models. Gyrochronology, a relationship between stellar rotation and age, appears to offer a reliable age indicator for main-sequence (MS) stars over the mass range of …
The fall of CSS100217: a tidal disruption-induced low state in an apparently hostless active galactic nucleus
Levan, A. J.; Cannizzaro, G.; van Velzen, S. +1 more
CSS100217 was a nuclear, rapid, and luminous flare in a narrow-line seyfert 1 galaxy, whose initial interpretation as a supernova is now debated between variability of the active galactic nucleus (AGN) and a tidal disruption event (TDE). In this paper, we present and discuss new evidence in favour of a TDE or extreme flaring episode scenario. Afte…
The Role of Binarity and Stellar Rotation in the Split Main Sequence of NGC 2422
de Grijs, Richard; Li, Chengyuan; Chen, Li +8 more
In addition to the extended main-sequence turnoffs widely found in young and intermediate-age (~600 Myr to 2 Gyr old) star clusters, some younger clusters even exhibit split main sequences (MSs). Different stellar rotation rates are proposed to account for the bifurcated MS pattern, with red and blue MSs (rMS and bMS) populated by fast and slowly …
The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au
Wittenmyer, Robert A.; Horner, Jonathan; Dupuy, Trent J. +12 more
Gliese 86 is a nearby K dwarf hosting a giant planet on a ≈16 day orbit and an outer white dwarf companion on a ≈century-long orbit. In this study we combine radial velocity data (including new measurements spanning more than a decade) with high angular resolution imaging and absolute astrometry from Hipparcos and Gaia to measure the current orbit…