Search Publications
Computing optical meteor flux using global meteor network data
Vida, Denis; Brown, Peter G.; Campbell-Brown, Margaret +3 more
Meteor showers and their outbursts are the dominant source of meteoroid impact risk to spacecraft on short time-scales. Meteor shower prediction models depend on historical observations to produce accurate forecasts. However, the current lack of quality and persistent world-wide monitoring at optical meteoroid sizes has left some recent major outb…
Where are the magnetar binary companions? Candidates from a comparison with binary population synthesis predictions
Lyman, J. D.; Kouveliotou, C.; Fruchter, A. S. +7 more
It is well established that magnetars are neutron stars with extreme magnetic fields and young ages, but the evolutionary pathways to their creation are still uncertain. Since most massive stars are in binaries, if magnetars are a frequent result of core-collapse supernovae, some fractions are expected to have a bound companion at the time of obse…
Tidal star-planet interaction and its observed impact on stellar activity in planet-hosting wide binary systems
Poppenhaeger, K.; Ilic, N.; Hosseini, S. Marzieh
Tidal interaction between an exoplanet and its host star is a possible pathway to transfer angular momentum between the planetary orbit and the stellar spin. In cases where the planetary orbital period is shorter than the stellar rotation period, this may lead to angular momentum being transferred into the star's rotation, possibly counteracting t…
Investigating Galactic binary cluster candidates with Gaia EDR3
Corradi, W. J. B.; Santos, J. F. C.; Maia, F. F. S. +1 more
A number of stellar open cluster (OC) pairs in the Milky Way occupy similar positions in the phase space (coordinates, parallax, and proper motions) and therefore may constitute physically interacting systems. The characterization of such objects based on observational data is a fundamental step towards a proper understanding of their physical sta…
Low gas-phase metallicities of ultraluminous infrared galaxies are a result of dust obscuration
Chartab, Nima; Fadda, Dario; Herrera-Camus, Rodrigo +9 more
Optical spectroscopic measurements show that gas in dusty, starbursting galaxies known as ultraluminous infrared galaxies (ULIRGs) in the local Universe has a significantly lower metal content than that of gas in star-forming galaxies with similar masses. This low metal content has resulted in the claim that ULIRGs are primarily fuelled by metal-p…
Activity cycles in RS CVn-type stars
Martínez, C. I.; Buccino, A. P.; Mauas, P. J. D.
We compile a list of 120 RS CVn-type stars from the bibliography in Southern hemisphere, to search for rotation periods and activity cycles, covering a large range of luminosities and effective temperatures for late stars. For each system of the list, we use photometric data from the All Sky Automated Survey (ASAS), and complement it with our own …
The Lingering Death of Periodic Near-Sun Comet 323P/SOHO
Mutchler, Max; Kracht, Rainer; Tholen, David J. +4 more
We observed near-Sun comet 323P/SOHO for the first time using ground and space telescopes. In late 2020 December, the object was recovered at Subaru showing no cometary features on its way to perihelion. However, in our postperihelion observations, it developed a long narrow tail mimicking a disintegrated comet. The ejecta, composed of at least mi…
Stellar multiplicity affects the correlation between protoplanetary disc masses and accretion rates: binaries explain high accretors in Upper Sco
Manara, Carlo F.; Zagaria, Francesco; Rosotti, Giovanni P. +1 more
In recent years, a correlation between mass accretion rates onto new-born stars and their protoplanetary disc masses was detected in nearby young star-forming regions. Although such a correlation can be interpreted as due to viscous-diffusion processes in the disc, highly accreting sources with low disc masses in more evolved regions remain puzzli…
The Magellanic Edges Survey - III. Kinematics of the disturbed LMC outskirts
Da Costa, G. S.; Belokurov, V.; Koposov, S. E. +3 more
We explore the structural and kinematic properties of the outskirts of the Large Magellanic Cloud (LMC) using data from the Magellanic Edges Survey (MagES) and Gaia EDR3. Even at large galactocentric radii (8° < R < 11°), we find the north-eastern LMC disc is relatively unperturbed: its kinematics are consistent with a disc of inclination ~3…
A Catalog of Early-type Hα Emission-line Stars and 62 Newly Confirmed Herbig Ae/Be Stars from LAMOST Data Release 7
Qin, Li; Luo, A. -Li; Hou, Wen +6 more
We derive a catalog of early-type emission-line stars including 30,023 spectra of 25,867 stars from LAMOST Data Release 7, in which 4189 have Simbad records. The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles. Some spectra contaminated by nebula emission lines such as from H II regions are fl…