Search Publications
Automatic detection of accretion bursts in young stellar objects: A new algorithm for long-term sky surveys
Altavilla, G.; Nucita, A.; Lorenzetti, D. +4 more
Young stellar objects in their pre-main sequence phase are characterized by irregular changes in brightness, generally attributed to an increase of the mass accretion rate due to various kind of instabilities occurring in the circumstellar disk. In the era of large surveys aimed to monitor the sky, we present a pipeline to detect irregular bursts,…
Approximation of discontinuous inverse operators with neural networks
Massa, Paolo; Benvenuto, Federico; Garbarino, Sara
In this work we deal with parametric inverse problems, which consist in recovering a finite number of parameters describing the structure of an unknown object, from indirect measurements. State-of-the-art methods for approximating a regularizing inverse operator by using a dataset of input-output pairs of the forward model rely on deep learning te…
Recent volcanism and tectonism in the pre-Nectarian basins Grimaldi and Crüger-Sirsalis: Shreds of evidence from LRO, Chandrayaan-1, and Kaguya
Bhatt, Megha; Bhardwaj, Anil; Srivastava, Neeraj
Datasets from remote sensing missions such as Kaguya, LRO, GRAIL, and Chandrayaan-1 have substantially improved our understanding of the geology of the Moon by revealing new details about impact cratering, volcanism, and tectonism. Most of the late-stage (< 2.8 Ga) volcanic activities on the Moon occurred in the Procellarum KREEP Terrain (PKT).…
Observations of Modulation of Ion Flux in the Coma of Comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Nilsson, H.; Goldstein, R. +4 more
On 6-8 June 2015, the Ion and Electron Sensor on board Rosetta observed keV-range water-group pickup ions arriving from the solar direction. Based on magnetic field intensification and variations, the appearance of the ions was likely to have been caused by a coronal mass ejection. During the 3-day period when Rosetta was 200 km from the comet, pe…
An Attempt to Identify Classical Cepheid Candidates in the LAMOST Spectroscopic Survey
Zhao, G.; Kovaleva, D.; Samus, N. N.
We describe our attempt to find new candidate classical Cepheids and other pulsating variable stars in the LAMOST spectroscopic survey using GAIA EDR3 data and existing photometric archives. Several stars deserve dedicated photometric observations.
Supermassive Black Hole Winds in X-rays
Bianchi, S.; Cappi, M.; Ponti, G. +22 more
SUBWAYS (Supermassive Black HoleWinds in X-rays) is an international program designed to provide a unique observational framework to test the validity of physical models for Active Galactic Nuclei (AGN) outflows. Its ultimate goal is to understand the AGN impact onto their host galaxies.Within this framework, we have been awarded a Large Program o…
X-ray galaxies selected from HyperLEDA database
Pulatova, N.; Tugay, A.; Zadorozhna, L. +4 more
We cross-matched the 4XMM-DR10 catalog with the HyperLEDA database and obtained a new sample of galaxies that contain X-ray sources. Excluding duplicate observations and false matches, we present a total of 7759 galaxies with X-ray sources. In the current work, we present general properties of the sample: namely the distribution in equatorial coor…
Characterization of the eclipsing post-common-envelope binary TIC 60040774
Knigge, C.; Scaringi, S.; Buckley, D. A. H. +2 more
Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a relatively short orbital period. Here, we present the characterization of an eclipsing post-common-enve…
New Photometric and Spectroscopic Observations of the Eclipsing Binary V2080 Cygni
Schwarzenberg-Czerny, A.; Kamiński, K.; Dimitrov, W. +7 more
We present new spectroscopic and photometric measurements of the eclipsing binary V2080 Cyg. It is a detached system with similar components and an orbital period of 4.9 d. We collected spectroscopic data with two instruments, 1.88 m DDO telescope equipped with Cassegrain spectrograph and 0.5 m PST1 connected to a fiber-fed echell\'e spectrograph.…
Navigation and Orbit Estimation for New Horizons' Arrokoth Flyby: Overview, Results and Lessons Learned
Weaver, Harold A.; Kavelaars, J. J.; Gwyn, Stephen D. J. +18 more
The New Horizons mission performed a successful flyby of Arrokoth, a distant Kuiper-Belt Object, on January 1, 2019, representing the farthest planetary encounter to date. The navigation strategy and performance required to deliver the spacecraft to the desired flyby target were driven by a number of challenges including those related to Arrokoth'…