Search Publications
Eclipse Timings of the LMXB XTE J1710-281 : discovery of a third orbital period glitch
Paul, Biswajit; Jain, Chetana; Sharma, Rahul
We present an updated measurement of orbital period evolution of LMXB XTE J1710-281 by using eclipse timing technique. Using data obtained with XMM-Newton, Suzaku, RXTE, Chandra, and AstroSat observatories, we report 21 new measurements of X-ray mid-eclipse times. We have discovered a third orbital period glitch in XTE J1710-281 with an F-test fal…
CoRoT-TESS eclipsing binaries with light-travel-time effect
Bódi, A.; Hajdu, T.; Matécsa, B. +1 more
Identifying long-period eclipsing binaries with space-based photometry is still a challenge even in the century of space telescopes due to the relatively short observation sequences and short lifetime of these missions. The Transiting Exoplanet Survey Satellite (TESS) space telescope is an appropriate tool to supplement previous space-based observ…
Constraining energy-dependent emissivity profiles of AGN inflows
Middleton, Matthew J.; Ashton, Dominic I.
The emissivity of the accretion flow is a key parameter affecting the shape of both the energy and variability power spectra of active galactic nuclei (AGNs). We explore the energy dependence of the power spectrum for five AGNs, across the XMM-Newton bandpass, and across the 0.01-1 mHz frequency range, finding a ubiquitous flattening of the power …
A broad-band X-ray study of the asynchronous polar CD Ind
Dutta, Anirban; Rana, Vikram
We present a simultaneous broad-band analysis of X-ray data obtained with the XMM-Newton and the Nuclear Spectroscopic Telescope Array (NuSTAR) for the asynchronous polar source, CD Ind. The spin-folded light curve in the soft 0.3-3.0 keV band shows a single broad hump-like structure superimposed with occasional narrow dips, indicating a single-po…
Discovery of a highly eccentric, chromospherically active binary: ASASSN-V J192114.84+624950.8
Kochanek, C. S.; Holoien, Thomas W. -S.; Stanek, K. Z. +5 more
As part of an All-Sky Automated Survey for SuperNovae (ASAS-SN) search for sources with large flux decrements, we discovered a transient where the quiescent, stellar source ASASSN-V J192114.84+624950.8 rapidly decreased in flux by $\sim 55{{\ \rm per\ cent}}$ (~0.9 mag) in the g band. The Transiting Exoplanet Survey Satellite light curve revealed …
Statistical properties of cataclysmic variables in the local galactic disc: a joint analysis of Gaia and XMM-Newton data
Wang, Q. Daniel; Xu, Xiao-jie; Li, Xiangdong
Cataclysmic variables (CVs) represent a key evolutionary phase of many low-mass stellar binaries and appear to collectively dominate the galactic X-ray background above ~1 keV. Statistical properties of CVs, however, remain poorly understood, even in the solar neighbourhood. We aim to obtain an X-ray luminosity-complete sample of local CVs whose d…
Herschel discovery of far-infrared emission from the hotspot D in the radio galaxy Cygnus A
Isobe, Naoki; Tashiro, Makoto S.; Sunada, Yuji +3 more
The far-infrared counterpart of hotspot D, the terminal hotspot of the eastern jet hosted by the radio galaxy Cygnus A, is detected with Herschel Aperture photometry of the source performed in 5 photometric bands covering the wavelength range of 70-350 $\mu$m. After removing the contamination from another nearby hotspot, E, the far-infrared intens…
Fast prograde coronal flows in solar active regions
Chamberlin, Phillip C.; Fletcher, Lyndsay; Mulay, Sargam M. +6 more
We report the discovery and characterization of high-speed (>100 km s-1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5-105 nm provided by the EVE (Extreme Ultraviolet Variability Experiment) spectrometers on the Solar Dynamics Observatory. These apparent flows are persistent on …
Chandra revisits WR 48a: testing colliding wind models in massive binaries
Skinner, Stephen L.; Zhekov, Svetozar A.; Gagné, Marc
We present results of new Chandra High-Energy Transmission Grating (HETG) observations (2019 November-December) of the massive Wolf-Rayet binary WR 48a. Analysis of these high-quality data showed that the spectral lines in this massive binary are broadened (full width at half-maximum, FWHM = 1400 km s-1) and marginally blueshifted (~-10…
Unravelling the nature of the dual AGN in the galaxy pair system IRAS 05589+2828 and 2MASX J06021107 + 2828382
Jiménez-Bailón, E.; Marziani, P.; Chavushyan, V. H. +10 more
We have studied the nuclear region of the previously detected dual AGN system in the galaxy pair IRAS 05589 + 2828 and 2MASX J06021107 + 2828382, through new optical spectroscopy observations, along with radio and X-ray archival data. Our multiwavelength data strongly suggest that the Sy1 IRAS 05589+2828 (z = 0.0330 ± 0.0002) conforms to a dual AG…