Search Publications
Exploring X-ray variability with unsupervised machine learning. I. Self-organizing maps applied to XMM-Newton data
Salvaterra, R.; Belfiore, A.; Marelli, M. +3 more
Context. XMM-Newton provides unprecedented insight into the X-ray Universe, recording variability information for hundreds of thousands of sources. Manually searching for interesting patterns in light curves is impractical, requiring an automated data-mining approach for the characterization of sources.
Aims: Straightforward fitting of tempor…
Long-term Photometric and Low-resolution Spectroscopic Analysis of Five Contact Binaries
Joshi, Y. C.; Panchal, A.; De Cat, Peter +1 more
A photometric and spectroscopic investigation is performed on five W Ursae Majoris eclipsing binaries J015818.6+260247 (hereinafter as J0158b), J073248.4+405538 (hereinafter as J0732), J101330.8+494846 (hereinafter as J1013), J132439.8+130747 (hereinafter as J1324), and J152450.7+245943 (hereinafter as J1524). The photometric data are collected wi…
Multiwavelength Observations of the Obscuring Wind in the Radio-quiet Quasar MR 2251-178
Kaastra, J. S.; Djorgovski, S. G.; Stern, D. +11 more
Obscuring winds driven away from active supermassive black holes are rarely seen due to their transient nature. They have been observed with multiwavelength observations in a few Seyfert 1 galaxies and one broad absorption line radio-quiet quasar so far. An X-ray obscuration event in MR 2251-178 was caught in late-2020, which triggered multiwavele…
Spatially resolved mass-metallicity relation at z ∼ 0.26 from the MUSE-Wide Survey
Lin, Zesen; Chen, Guangwen; Kong, Xu +5 more
Aims: Galaxies in the local universe have a spatially resolved star-forming main sequence (rSFMS) and mass-metallicity relation (rMZR). We know that the global mass-metallicity relation (MZR) results from the integral of the rMZR, and it evolves with redshift. However, the evolution of the rMZR with redshift is still unclear because the spati…
Parker Solar Probe Imaging of the Night Side of Venus
Lustig-Yaeger, Jacob; Vourlidas, Angelos; Stenborg, Guillermo +14 more
We present images of Venus from the Wide-Field Imager for Parker Solar Probe (WISPR) telescope on board the Parker Solar Probe (PSP) spacecraft, obtained during PSP's third and fourth flybys of Venus on 2020 July 11 and 2021 February 20, respectively. Thermal emission from the surface is observed on the night side, representing the shortest wavele…
Cellular patterns and dry convection in textured dust storms at the edge of Mars North Polar Cap
Sánchez-Lavega, A.; Matz, K. -D.; Tirsch, D. +9 more
We present a study of textured local dust storms that develop at the northern polar cap boundary on Mars springtime. We have used images obtained with VMC and HRSC cameras onboard Mars Express and MARCI on MRO to analyze dust storms captured from March to July 2019 (Ls = 350° in MY 34-Ls = 54° in MY 35). The textured storms grow in the longitude s…
The probabilistic solar particle event forecasting (PROSPER) model
Paassilta, Miikka; Raukunen, Osku; Vainio, Rami +6 more
The Probabilistic Solar Particle Event foRecasting (PROSPER) model predicts the probability of occurrence and the expected peak flux of solar energetic particle (SEP) events. Predictions are derived for a set of integral proton energies (i.e., E > 10, > 30, and > 100 MeV) from characteristics of solar flares (longitude, magnitude), corona…
Cometary dust analogues for physics experiments
Zhang, X.; Sierks, H.; Blum, J. +25 more
The CoPhyLab (Cometary Physics Laboratory) project is designed to study the physics of comets through a series of earth-based experiments. For these experiments, a dust analogue was created with physical properties comparable to those of the non-volatile dust found on comets. This 'CoPhyLab dust' is planned to be mixed with water and CO2
TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +60 more
We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining thes…
Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
Kuzuhara, M.; Tamura, M.; Kudo, T. +45 more
Context. Despite being a prominent subset of the exoplanet population discovered in the past three decades, the nature and provenance of sub-Neptune-sized planets is still one of the open questions in exoplanet science.
Aims: For planets orbiting bright stars, precisely measuring the orbital and planet parameters of the system is the best app…