Search Publications
Oort cloud Ecology. I. Extra-solar Oort clouds and the origin of asteroidal interlopers
Portegies Zwart, S.
We simulate the formation and evolution of Oort clouds around the 200 nearest stars (within ∼16 pc according to the Gaia DR2) database. This study is performed by numerically integrating the planets and minor bodies in orbit around the parent star and in the Galactic potential. The calculations start 1 Gyr ago and continue for 100 Myr into the fut…
Detection of Flare-associated CME Candidates on Two M-dwarfs by GWAC and Fast, Time-resolved Spectroscopic Follow-ups
Wang, J.; Li, H. L.; Xin, L. P. +8 more
The flare-associated stellar coronal mass ejections (CMEs) of solar-like and late-type stars profoundly impact the habitability of any expolanets in the systems. In this paper, we report the detection of flare-associated CMEs for two M-dwarfs, thanks to a high-cadence survey carried out by the Ground Wide-angle Camera system and fast photometric a…
The MURALES survey. IV. Searching for nuclear outflows in 3C radio galaxies at z < 0.3 with MUSE observations
Marconi, A.; Capetti, A.; Grandi, P. +13 more
We analyze VLT/MUSE observations of 37 radio galaxies from the Third Cambridge catalogue (3C) with redshift < 0.3 searching for nuclear outflows of ionized gas. These observations are part of the MURALES project (a MUse RAdio Loud Emission line Snapshot survey), whose main goal is to explore the feedback process in the most powerful radio-loud …
Martian Hydrated Minerals: A Significant Water Sink
Jakosky, Bruce M.; Wernicke, Liza J.
Quantifying the water in all Martian water reservoirs is important for understanding the history of water on Mars, including Mars' past climate and potential for habitability. Hydrated minerals are widespread on Mars and may comprise a significant portion of the water inventory. We calculated the possible volumes of water stored within and require…
Constraining planetesimal stirring: how sharp are debris disc edges?
Marino, Sebastian
The dust production in debris discs by grinding collisions of planetesimals requires their orbits to be stirred. However, stirring levels remain largely unconstrained, and consequently the stirring mechanisms as well. This work shows how the sharpness of the outer edge of discs can be used to constrain the stirring levels. Namely, the sharper the …
One of Everything: The Breakthrough Listen Exotica Catalog
DeBoer, David; Gajjar, Vishal; Siemion, Andrew P. V. +12 more
We present Breakthrough Listen's Exotica Catalog as the centerpiece of our efforts to expand the diversity of targets surveyed in the Search for Extraterrestrial Intelligence (SETI). As motivation, we introduce the concept of survey breadth, the diversity of objects observed during a program. Several reasons for pursuing a broad program are given,…
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…