Search Publications
Dust extinction towards the type Ia supernova 2012cu in NGC 4772
Gao, Jian; Jiang, Biwei; Li, Jun +2 more
Using photometric and spectroscopic data of Supernova (SN) 2012cu, a fairly reddened type Ia supernova, we derived its color excess curves and probed the dust extinction in its host galaxy, NGC 4772. In order to derive the extinction as a function of wavelength (i.e., Aλ), we model the color excess curves of SN 2012cu in terms of dust m…
Spin pairs in the Koronis asteroid family
Carruba, V.; Aljbaae, S.; Martins, B. +4 more
Asteroid groups may either form because of collisions or the rotational failure of a parent body. Collisional asteroid families tend to be more spread in proper element domains, while young spin clusters are usually much more compact. Recently, it has been shown that young spin clusters may form at higher rates in extremely young asteroid families…
Electrical properties of cometary dust particles derived from line shapes of TOF-SIMS spectra measured by the ROSETTA/COSIMA instrument
Langevin, Yves; Fischer, Henning; Koch, Andreas +21 more
Between Aug. 2014 and Sept. 2016, while ESA's cornerstone mission Rosetta was operating in the vicinity of the nucleus and in the coma of comet 67P/Churyumov-Gerasimenko, the COSIMA instrument collected a large number of dust particles with diameters up to a millimeter. Positive or negative ions were detected by a time-of-flight secondary ion mass…
Vertical controlled landing on 67P / Churyumov-Gerasimenko
Probst, A.; San Martín, A.; Zimmer, A. +2 more
With the increasing interest of small body science due to its important role in the puzzle of the solar system formation, missions to small bodies are studied and developed in preparation for future exploration. Together with the operational experience gained and the general rapid technology development, landers and surface mobility elements enabl…
On the unexpected geomagnetic storm on june 8, 2019, and the heliospheric current sheet effect
Augusto, C. R. A.; Navia, C. E.; de Oliveira, M. N. +1 more
A period of minimum magnetic solar activity (such as June 2019) favors the observation of rare solar transient events, which would otherwise be lost in the magnetic vortex during a period of maximum solar activity. In this paper, we show that the most plausible explanation for the origin of an unexpected geomagnetic storm on June 8, 2019, is a sma…
Simple model of the wave pattern in the atmosphere of a slow rotating planet due to surface irregularities
Vigh, Carlos; Cirilo-Lombardo, Diego; Mayochi, Mariano +1 more
Recent observations show a persistent pattern on Venus surface, interpreted as a stationary wave due to the interaction of the prevailing winds with the orography of the planet. In this work we use an idealized model of the phenomenon that allows for a fully analytical solution applied to a slow rotating planet with idealized obstacles. We use Ven…
Arecibo radar observations of near-Earth asteroid (3200) Phaethon during the 2017 apparition
Bhiravarasu, Sriram S.; Benner, Lance A. M.; Giorgini, Jon D. +8 more
We report Arecibo S-band (2380 MHz; 12.6 cm) radar observations of near-Earth asteroid (3200) Phaethon during the December 2017 apparition when Phaethon passed within 0.07 au of Earth. Radar images with a resolution of 75 m per pixel reveal a roughly spheroidal shape more than 6 km in diameter at the equator with several discernible surface featur…
Automated crater detection on Mars using deep learning
Lee, Christopher
Impact crater cataloging is an important tool in the study of the geological history of planetary bodies in the Solar System, including dating of surface features and geologic mapping of surface processes. Catalogs of impact craters have been created by a diverse set of methods over many decades, including using visible or near infra-red imagery a…
Dusk over dawn O2 asymmetry in Europa's near-surface atmosphere
Johnson, Robert E.; Chaufray, Jean-Yves; Oza, Apurva V. +4 more
The evolution of Europa's water-product exosphere over its 85-h day, based on current models, has not been shown to exhibit any diurnal asymmetries. Here we simulate Europa's exosphere using a 3-D Monte Carlo routine including, for the first time, the role of Europa's rotation on the evolution of exospheric molecules tracked throughout the orbit. …
A comparative study of size frequency distributions of Jupiter Trojans, Hildas and main belt asteroids: A clue to planet migration history
Terai, Tsuyoshi; Takato, Naruhisa; Ohtsuki, Keiji +4 more
Since 2002, we have obtained size frequency distributions (SFDs) of main belt asteroids (MBAs), Hildas, and Jupiter Trojans (JTs) by using the 8.2-m Subaru Telescope equipped with the wide-field CCD cameras: Suprime-Cam (SC) or Hyper Suprime-Cam (HSC). After combining these SFDs with SFDs obtained from other surveys, we performed a comparative stu…