Search Publications
A redshifted excess in the broad emission lines after the flare of the γ-ray narrow-line Seyfert 1 PKS 2004−447
Wolf, C.; Marziani, P.; Berton, M. +6 more
PKS 2004−447 is a narrow-line Seyfert 1 (NLS1) harbouring a relativistic jet with γ-ray emission. On 2019 October 25, the Fermi-Large Area Telescope captured a γ-ray flare from this source, offering a chance to study the broad-line region (BLR) and jet during such violent events. This can provide insights into the BLR structure and jet interaction…
Insight into the Origin of Cometary Ices from Rosetta/ROSINA Mass Spectrometer Data
Rubin, Martin
Here we review some of the major findings of the mass spectrometer suite ROSINA on board of ESA's Rosetta spacecraft to comet 67P/Churyumov-Gerasimenko. For more than 2 years, ROSINA continuously measured the composition of the gases sublimating from the comet's nucleus. ROSINA measurements provided insight into the origin of the ices in 67P/Chury…
X-Rays Trace the Volatile Content of Interstellar Objects
Wang, Q. Daniel; Cabot, Samuel H. C.; Seligman, Darryl Z.
The nondetection of a coma surrounding 1I/'Oumuamua, the first discovered interstellar object (ISO), has prompted a variety of hypotheses to explain its nongravitational acceleration. Given that forthcoming surveys are poised to identify analogs of this enigmatic object, it is prudent to devise alternative approaches to characterization. In this s…
Investigation of the Effect of the Errors of Limb Darkening Coefficients on the Geometric Parameters of a Binary System with an Exoplanet
Abubekerov, M. K.; Gostev, N. Yu.
Based on the observed light curves of Kepler-5, Kepler-6, Kepler-7, HD 209458, a search was made for the geometric parameters of a binary system with an exoplanet for different values of the limb darkening coefficients of the parent star. It is shown that for the observed light curves with relative accuracy ${{10}^{{ - 4}}}{-} {{10}^{{ - 5}}}$, an…
Detection of polycyclic aromatic hydrocarbons on a sample of comets
Bhardwaj, Anil; Ramachandran, R.; Hill, H. +6 more
We present the spectral properties of a selection of comets from both the Jupiter family and Oort cloud in the ultraviolet (UV) and mid-infrared (IR) wavelength regions. Spectroscopic measurements are retrieved from public archival data of the International Ultraviolet Explorer (IUE) and Hubble Space Observatory (HST) in the near-UV (NUV) and far-…
Updated Orbital Decay Rate of WASP-12 with New Data from TESS and Ground-based Observations
Kutluay, Ahmet Cem; Basturk, Ozgur; Yalçinkaya, Selçuk +2 more
We investigate the orbital decay behavior of the well-studied hot Jupiter WASP-12\,b orbiting its late-F host star on a 1.09-day orbit by analyzing its transit timings. Thanks to precise photometric data covering nearly 15 years of observations from the space and the ground since the discovery of the planet, including a transit light curve of our …
The new magnetar SGR J1830-0645 in outburst
Coti Zelati, Francesco
The magnetar SGR J1830-0645 was discovered in outburst in October 2020. We studied its X-ray properties during the first month of the outburst using XMM-Newton, NuSTAR and Swift observations. The shape and amplitude of the pulse profile varied significantly with energy. The broadband spectrum was well described using two absorbed blackbody compone…
The Role of Friction in the LISA-Pathfinder Release Mechanism Anomaly
Bortoluzzi, Daniele; Vignotto, Davide; Radaelli, Paolo +4 more
Release mechanisms are crucial devices for the success of space missions. In LISA, the first gravitational waves observatory in space, the grabbing positioning and release mechanism (GPRM) is responsible for setting all the test masses (TMs) in the free-fall condition necessary for starting science observations. This mechanism is considered a key …
Supermassive black holes in a mass-limited galaxy sample
Drinkwater, Michael J.; Côté, Patrick; Ferrarese, Laura +8 more
The observed scaling relations between supermassive black hole masses and their host galaxy properties indicate that supermassive black holes influence the evolution of galaxies. However, the scaling relations may be affected by selection biases. We propose to measure black hole masses in a mass-limited galaxy sample including all non-detections t…
A statistical study of trans-equatorial loops from 2006 to 2020
Pevtsov, Alexei A.; Xue, Zhike; Su, Jiangtao +5 more
We studied trans-equatorial loops (TLs) statistically from December 2006 to 2020. During this period, 160 TLs were identified, and 12 per cent of all active regions are connected by TLs. The result shows that 74 per cent of TLs are connected to regions of preceding magnetic polarity (PTLs), and only 26 per cent of TLs are connected to regions of f…