Search Publications
TESSILATOR: a one-stop shop for measuring TESS rotation periods
Günther, H. M.; Binks, A. S.
We present a software package designed to produce photometric light curves and measure rotation periods from full-frame images taken by the Transiting Exoplanet Survey Satellite (TESS), which we name 'TESSILATOR'. TESSILATOR is the only publicly available code that will run a full light curve and rotation period ($P_{\rm rot}$) analysis based on j…
VLBI detection of the AE Aqr twin, LAMOST J024048.51+195226.9
Zhang, Bo; Yang, Jun; An, Tao +8 more
LAMOST J024048.51+195226.9 (J0240+1952) was recently identified as the second AE Aquarii (AE Aqr)-type cataclysmic variable, possessing the fastest known rotating white dwarf. We performed a Very Long Baseline Interferometry (VLBI) observation of J0240+1952 utilizing the European VLBI Network at 1.7 GHz, to obtain the first view of the radio morph…
V407 Lup, an intermediate polar nova
Luna, G. J. M.; Orio, M.; Ciroi, S. +6 more
We present X-ray and optical observations of nova V407 Lup (Nova Lup 2016), previously well monitored in outburst, as it returned to quiescent accretion. The X-ray light curve in 2020 February revealed a clear flux modulation with a stable period of 564.64 $\pm$ 0.64 s, corresponding to the period measured in outburst and attributed to the spin of…
Exploration of faint X-ray and radio sources in the massive globular cluster M14: a UV-bright counterpart to Nova Ophiuchus 1938
D'Antona, Francesca; Milone, Antonino P.; Heinke, Craig +4 more
Using a 12 ks archival Chandra X-ray Observatory ACIS-S observation on the massive globular cluster (GC) M14, we detect a total of 7 faint X-ray sources within its half-light radius at a $0.5{\small --}7\, \mathrm{keV}$ depth of $2.5\times 10^{31}\, \mathrm{erg s^{-1}}$. We cross-match the X-ray source positions with a catalogue of the Very Large …
An experimental study of the biological impact of a superflare on the TRAPPIST-1 planets
Luna, G. J. M.; Patel, M. R.; Hanslmeier, A. +5 more
In this study, we conducted experiments to assess the biological effects of high fluences of UV radiation (UVR) on the TRAPPIST-1 planetary system (planets e, f, g within the habitable zone), unlike previous estimates made by other authors which used theoretical approaches. To this end, we first calculated the UV fluxes at the orbits of the planet…
Dynamics and structure of network magnetic fields: supergranular vortex expansion-contraction
Chian, Abraham C. -L.; Rempel, Erico L.; Gošić, Milan +1 more
We report on the formation of a large magnetic coherent structure in a vortex expansion-contraction interval, resulting from the merger of two plasmoids driven by a supergranular vortex observed by Hinode in the quiet-Sun. Strong vortical flows at the interior of vortex boundary are detected by the localized regions of high values of the instantan…
Beyond the rings: Polar ring galaxy NGC 4262 and its globular cluster system
Mathew, Blesson; Kartha, Sreeja S.; Akhil, Krishna R.
In the context of the hierarchical model of galaxy evolution, polar ring galaxies (PRGs) are considered the intermediate phase between ongoing mergers and quiescent galaxies. This study explores the globular cluster system (GCS) and its properties in the nearest PRG, NGC4262, serving as a pilot investigation to study GCS in nearby PRGs. We utilize…
Detailed mapping of the Galactic disc structure in the solar neighbourhood through LAMOST K dwarfs
Qiu, Dan; Tian, Hao; Liu, Chao +4 more
The Galactic disc is one of the main components of the Milky Way, which contributes most of the luminosity. Its structure is essential for understanding the formation and evolution of the Milky Way. Using 174 443 K-type dwarf stars observed by both Large Sky Area Multi-Object Fiber Spectroscopic Telescope and Gaia Data Release 3, we study the disc…
AGN-driven outflows in the OH absorber galaxy IRAS 19154+2704
Robinson, Andrew; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +4 more
We present a two-dimensional study of the gas distribution, excitation, and kinematics of the OH absorber galaxy IRAS 19154+2704 using Gemini Multi-Object Spectrograph integral field unit observations. Its continuum image shows a disturbed morphology indicative of a past or ongoing interaction. The ionized gas emission presents two kinematic compo…
Effect of area divergence and frequency on damping of slow magnetoacoustic waves propagating along umbral fan loops
Gupta, Girjesh R.; Rawat, Ananya
Waves play an important role in the heating of solar atmosphere; however, observations of wave propagation and damping from the solar photosphere to corona through chromosphere and transition region are very rare. Recent observations have shown propagation of 3-min slow magnetoacoustic waves (SMAWs) along fan loops from the solar photosphere to co…