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Apparent Motion of the Circumstellar Envelope of CQ Tau in Scattered Light
Strakhov, Ivan A.; Goliguzova, Maria V.; Safonov, Boris S. +1 more
The study of spiral structures in protoplanetary disks is of great importance for understanding the processes in the disks, including planet formation. Bright spiral arms were detected in the disk of young star CQ Tau by Uyama et al. in the H and L bands. The spiral arms are located inside the gap in millimeter-sized dust, discovered earlier using…
The detection of radio emission from known X-ray flaring star EXO 040830-7134.7
Woudt, P. A.; Williams, D. R. A.; Fender, R. P. +4 more
We report the detection of radio emission from the known X-ray flaring star EXO 040830-7134.7 during Karoo Array Telescope (MeerKAT) observations of the nearby cataclysmic variable VW Hydri. We have three epochs of MeerKAT observations, where the star is not detected in the first epoch, is detected in the second epoch, and is marginally detected i…
Evidence for a milliparsec-separation supermassive binary black hole with quasar microlensing
Courbin, F.; Sluse, D.; Lemon, C. +4 more
We report periodic oscillations in the 15-year-long optical light curve of the gravitationally lensed quasar Q J0158−4325 at zs = 1.29. The signal is enhanced during a high magnification microlensing event of the quasar that the fainter lensed image, B, underwent between 2003 and 2010. We measure a period of Po = 172.6 ± 0.9 …
Automated Extended Aperture Photometry of K2 Variable Stars
Bódi, Attila; Szabó, Róbert; Molnár, László +2 more
Proper photometric data are challenging to obtain in the K2 mission of the Kepler space telescope due to strong systematics caused by the two-wheel-mode operation. It is especially true for variable stars wherein physical phenomena occur on timescales similar to the instrumental signals. We originally developed a method with the aim to extend the …
Relic jet activity in 'Hanny's Voorwerp' revealed by the LOFAR two metre sky survey
Hardcastle, M. J.; Smith, D. J. B.; Drake, A. B. +1 more
We report new observations of 'Hanny's Voorwerp' (hereafter HV) taken from the second data release of the LOFAR Two-metre Sky Survey (LoTSS). HV is a highly-ionized region in the environs of the galaxy IC2497, first discovered by the Galaxy Zoo project. The new 150 MHz observations are considered in the context of existing multi frequency radio da…
SCExAO and Keck Direct Imaging Discovery of a Low-mass Companion Around the Accelerating F5 Star HIP 5319
Currie, Thayne; Tamura, Motohide; Bailey, John I., III +26 more
We present the direct imaging discovery of a low-mass companion to the nearby accelerating F star, HIP 5319, using SCExAO coupled with the CHARIS, VAMPIRES, and MEC instruments in addition to Keck/NIRC2 imaging. CHARIS JHK (1.1-2.4 µm) spectroscopic data combined with VAMPIRES 750 nm, MEC Y, and NIRC2 L p photometry is best matche…
Evolution of the Hub-filament Structures in IC 5146 in the Context of the Energy Balance of Gravity, Turbulence, and Magnetic Field
Kwon, Woojin; Soam, Archana; Cho, Jungyeon +3 more
We present the results of 850 µm polarization and C18O (3 - 2) line observations toward the western hub-filament structure (W-HFS) of the dark Streamer in IC 5146 using the James Clerk Maxwell Telescope SCUBA-2/POL-2 and HARP instruments. We aim to investigate how the relative importance of the magnetic field, gravity, and turbule…
Calibration of NOMAD on ESA's ExoMars Trace Gas Orbiter: Part 1 - The Solar Occultation channel
Vandaele, Ann Carine; Neefs, Eddy; Aoki, Shohei +17 more
Nadir and Occultation for MArs Discovery (NOMAD) is a 3-channel spectrometer suite that is currently orbiting Mars onboard ESA's ExoMars Trace Gas Orbiter, measuring the composition of the Martian atmosphere in unprecedented detail. Of the three channels, two operate in the infrared: the Solar Occultation (SO) channel observes gas species in the 2…
SoUthern Cluster sCale Extended Source Survey (SUCCESS): a GMRT and Meerkat study of nine massive galaxy clusters
Kale, R.; Venturi, T.; Joshi, D. C. +7 more
We aim to carry out a radio study of the SoUthern Cluster sCale Extended Source Survey (SUCCESS) sample consisting of 20 massive (M500 > 5 × 1014 M⊙), nearby (redshift <0.3) and southern (-50° < δ < -30°) galaxy clusters detected by the Planck satellite and the South Pole Telescope. Here, we report targ…
Finding the birthplace of HMXBs in the Galaxy using Gaia EDR3: Kinematical age determination through orbit integration
García, Federico; Chaty, Sylvain; Fortin, Francis
Context. High-mass X-ray binaries (HMXBs) are produced after the first supernova event in a massive binary. These objects are intrinsically young and can suffer from a significant natal kick. As such, the progenitors of HMXBs are likely to have formed away from the current location of the X-ray emitting systems.
Aims: We aim to find the birth…