Search Publications
First black hole mass estimation for the quadruple lensed system WGD2038-4008
Assef, R. J.; Godoy, N.; Mediavilla, E. +6 more
Context. The quadruple lensed system WGD2038-4008 (zs = 0.777 ± 0.001) has recently been discovered with the help of new techniques and observations. Black hole masses have been estimated for lensed quasars, but they have mostly been calculated for one broad emission line of one image. However, the images could be affected by microlensi…
The Investigation of Seven Kepler Contact Binaries in the Field of NGC 6819
Liu, L.; Li, X. -Z.
Using the Kepler Eclipsing Binary Catalog, we found seven EW-type eclipsing binaries within the tidal radius of the intermediate-aged open cluster NGC 6819 (about 40'). These seven EW eclipsing binaries are all confirmed to be contact binaries by light curve analysis with the 2015 version Wilson-Devinney program. Using the parameter characteristic…
Approximate analytical description of the high latitude extinction
Malkov, Oleg; Kovaleva, Dana; Nekrasov, Alexei +1 more
The distribution of visual interstellar extinction AV has been mapped in selected areas over the Northern sky, using available LAMOST DR5 and Gaia DR2/EDR3 data. AV was modelled as a barometric function of galactic latitude and distance. The function parameters were then approximated by spherical harmonics. The resulting anal…
Detection of photometric variability in the very low-mass binary VHS J1256-1257AB using TESS and Spitzer
Miles-Páez, P. A.
Aims: We investigate the photometric properties of the M7.5 equal-mass binary VHS J1256-1257AB, which, combined with the late-L dwarf VHS J1256-1257 b, forms one of the few young triple systems of ultra-cool dwarfs currently known.
Methods: We analyzed two-minute TESS and two-second Spitzer archival data with total durations of about 25 …
A Study about the Secular Evolution of the Hierarchical Three-body Problem Using the Numerical Integrator TIDES
Docobo, José A.; Campo, Pedro P.; Piccotti, Luca +1 more
The hierarchical three-body problem is one of the classical issues of celestial mechanics, but recently it has regained importance due to its applications to new scenarios, like compact objects and exoplanets. In this paper we realize a computational study of this problem using the TIDES software package, which is applied not only to a set of theo…
Detection of Coronal Mass Ejections Using Unsupervised Deep Clustering
Alshehhi, Rasha; Marpu, Prashanth R.
Coronal mass ejection (CME) is a highly energetic solar phenomenon. It has a significant impact on the space weather in the near-Earth environment. With the accumulation of CME observations, it becomes more challenging to handle them manually. Therefore, we need an automatic method for identifying CMEs. We propose an unsupervised method for classi…
Data-Based Modeling of the Earth's Magnetic Field
Sitnov, Mikhail; Stephens, Grant; Tsyganenko, Nikolai +2 more
A new laboratory emissivity and reflectance spectral library for the interpretation of Mars thermal infrared spectral data
Maturilli, A.; Helbert, J.; Alemanno, G. +1 more
New spectral orbital thermal infrared data of Mars are being acquired by the thermal infrared channel TIRVIM (in honor of Vassily Ivanovich Moroz) of the Atmospheric Chemistry Suite (ACS) of spectrometers on board of ExoMars2016 mission. TIRVIM encompasses the spectral range of 1.7-17 µm. A major challenge brought by the analysis of these da…
Planet Mercury: Volcanism in a theatre of global contraction, with examples from the Hokusai quadrangle
Byrne, Paul K.; Rothery, David A.; Wright, Jack
Mercury's geological history has been dominated by global contraction caused by secular cooling of the planet's interior. This cooling has had a profound effect on the expression of the planet's volcanism and tectonism, and the expressions of these two surface evolutionary processes are deeply intertwined. Here, we use case studies from the Hokusa…
Estimating the age-metallicity distribution of a stellar sample from the probability distributions of the individual stars
Lindegren, Lennart; Sahlholdt, Christian L.
Estimating age distributions, or star formation histories, of stellar populations in the Milky Way is important in order to study the evolution of trends in elemental abundances and kinematics. We build on previous work to develop an algorithm for estimating the age-metallicity distribution which uses the full age-metallicity probability density f…