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Resolving Structure in the Debris Disk around HD 206893 with ALMA
Hughes, A. Meredith; Wilner, David J.; Moór, Attila +7 more
Debris disks are tenuous, dusty belts surrounding main-sequence stars generated by collisions between planetesimals. HD 206893 is one of only two stars known to host a directly imaged brown dwarf orbiting interior to its debris ring, in this case at a projected separation of 10.4 au. Here we resolve structure in the debris disk around HD 206893 at…
Hoinga: a supernova remnant discovered in the SRG/eROSITA All-Sky Survey eRASS1
Merloni, A.; Nicastro, L.; Becker, W. +4 more
Supernova remnants (SNRs) are observable for about (6−15) × 104 yr before they fade into the Galactic interstellar medium. With a Galactic supernova rate of approximately two per century, we can expect to have of the order of 1200 SNRs in our Galaxy. However, only about 300 of them are known to date, with the majority having been discov…
Multi-wavelength Observations of AT2019wey: a New Candidate Black Hole Low-mass X-ray Binary
Kulkarni, S. R.; Cenko, S. Bradley; Duev, Dmitry A. +21 more
AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234) is a transient first reported by the ATLAS optical survey in 2019 December. It rose to prominence upon detection, three months later, by the Spektrum-Roentgen-Gamma (SRG) mission in its first all-sky survey. X-ray observations reported in Yao et al. suggest that AT2019wey is a Galactic low-m…
Distance and extinction to the Milky Way spiral arms along the Galactic centre line of sight
Nogueras-Lara, F.; Neumayer, N.; Schödel, R.
Context. The position of the Sun inside the disc of the Milky Way significantly hampers the study of the spiral arm structure given the high amount of dust and gas along the line of sight, and the overall structure of this disc has therefore not yet been fully characterised.
Aims: We aim to analyse the spiral arms in the line of sight towards…
Rotating Filament in Orion B: Do Cores Inherit Their Angular Momentum from Their Parent Filament?
Mardones, Diego; Hsieh, Cheng-Han; Arce, Héctor G. +2 more
Angular momentum is one of the most important physical quantities that governs star formation. The initial angular momentum of a core may be responsible for its fragmentation, and can have an influence on the size of the protoplanetary disk. To understand how cores obtain their initial angular momentum, it is important to study the angular momentu…
Solar Origins of August 26, 2018 Geomagnetic Storm: Responses of the Interplanetary Medium and Equatorial/Low-Latitude Ionosphere to the Storm
Akala, A. O.; Oyedokun, O. J.; Amaechi, P. O. +3 more
This study investigates the solar origins of August 26, 2018 geomagnetic storm and the responses of the interplanetary medium and equatorial/low-latitude ionosphere to it. We used a multiinstrument approach, with observations right from the solar surface to the Earth. Our results showed that the G3 geomagnetic storm of August 26, 2018 was initiate…
The effects of surface fossil magnetic fields on massive star evolution - III. The case of τ Sco
Martins, F.; Meynet, G.; de Koter, A. +2 more
τ Sco, a well-studied magnetic B-type star in the Upper Sco association, has a number of surprising characteristics. It rotates very slowly and shows nitrogen excess. Its surface magnetic field is much more complex than a purely dipolar configuration which is unusual for a magnetic massive star. We employ the CMFGEN radiative transfer code to dete…
Swift/UVOT follow-up of gravitational wave alerts in the O3 era
Troja, E.; Cenko, S. B.; Sakamoto, T. +41 more
In this paper, we report on the observational performance of the Swift Ultra-violet/Optical Telescope (UVOT) in response to the gravitational wave (GW) alerts announced by the Advanced Laser Interferometer Gravitational Wave Observatory and the Advanced Virgo detector during the O3 period. We provide the observational strategy for follow-up of GW …
Linking the Sun to the Heliosphere Using Composition Data and Modelling
Del Zanna, Giulio; Wimmer-Schweingruber, Robert F.; Lynch, Benjamin J. +13 more
Our understanding of the formation and evolution of the corona and the heliosphere is linked to our capability of properly interpret the data from remote sensing and in-situ observations. In this respect, being able to correctly connect in-situ observations with their source regions on the Sun is the key for solving this problem. In this work we a…
First Comet Observations with NIRSPEC-2 at Keck: Outgassing Sources of Parent Volatiles and Abundances Based on Alternative Taxonomic Compositional Baselines in 46P/Wirtanen
Villanueva, Geronimo L.; Cochran, Anita L.; Bodewits, Dennis +18 more
A major upgrade to the NIRSPEC instrument at the Keck II telescope was successfully completed in time for near-infrared spectroscopic observations of comet 46P/Wirtanen during its exceptionally close flyby of Earth in 2018 December. These studies determined the abundances of several volatiles, including C2H2, C2H