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Forbidden hugs in pandemic times. I. Luminous red nova AT 2019zhd, a new merger in M 31
Lundqvist, P.; Rest, A.; Munari, U. +20 more
We present the follow-up campaign of the luminous red nova (LRN)
Water Group Exospheres and Surface Interactions on the Moon, Mercury, and Ceres
Li, Shuai; Wöhler, Christian; Berezhnoy, Alexey A. +7 more
Water ice, abundant in the outer solar system, is volatile in the inner solar system. On the largest airless bodies of the inner solar system (Mercury, the Moon, Ceres), water can be an exospheric species but also occurs in its condensed form. Mercury hosts water ice deposits in permanently shadowed regions near its poles that act as cold traps. W…
ALMA survey of Lupus class III stars: Early planetesimal belt formation and rapid disc dispersal
Testi, L.; Tazzari, M.; Williams, J. P. +9 more
Class III stars are those in star forming regions without large non-photospheric infrared emission, suggesting recent dispersal of their protoplanetary discs. We observed 30 class III stars in the 1-3 Myr Lupus region with ALMA at ∼856µm, resulting in four detections that we attribute to circumstellar dust. Inferred dust masses are 0.036-0.0…
Cloud-by-cloud, multiphase, Bayesian modelling: application to four weak, low-ionization absorbers
Richter, Philipp; Charlton, Jane C.; Kacprzak, Glenn G. +8 more
We present a new method aimed at improving the efficiency of component by component ionization modelling of intervening quasar absorption-line systems. We carry out cloud-by-cloud, multiphase modelling making use of CLOUDY and Bayesian methods to extract physical properties from an ensemble of absorption profiles. Here, as a demonstration of metho…
Circumbinary and circumstellar discs around the eccentric binary IRAS 04158+2805 - a testbed for binary-disc interaction
Duchêne, Gaspard; Ménard, François; Stapelfeldt, Karl +10 more
IRAS 04158+2805 has long been thought to be a very low mass T-Tauri star (VLMS) surrounded by a nearly edge-on, extremely large disc. Recent observations revealed that this source hosts a binary surrounded by an extended circumbinary disc with a central dust cavity. In this paper, we combine ALMA multiwavelength observations of continuum and …
High tide: a systematic search for ellipsoidal variables in ASAS-SN
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +5 more
The majority of non-merging stellar mass black holes are discovered by observing high energy emission from accretion processes. Here, we pursue the large, but still mostly unstudied population of non-interacting black holes and neutron stars by searching for the tidally induced ellipsoidal variability of their stellar companions. We start from a s…
Asteroid absolute magnitudes and phase curve parameters from Gaia photometry
Cellino, A.; Muinonen, K.; Penttilä, A. +2 more
Aims: We perform light curve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from Gaia Data Release 2 and the dense ground-based observations from the DAMIT database. We develop a method for th…
Bird's eye view of molecular clouds in the Milky Way. I. Column density and star formation from sub-parsec to kiloparsec scales
Kainulainen, Jouni; Spilker, Andri; Orkisz, Jan
Context. Describing how the properties of the interstellar medium are combined across various size scales is crucial for understanding star formation scaling laws and connecting Galactic and extragalactic data of molecular clouds.
Aims: We describe how the statistical structure of the clouds and its connection to star formation changes from s…
On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy
Salaris, M.; Lemasle, B.; Zoccali, M. +30 more
We discuss the largest and most homogeneous spectroscopic data set of field RR Lyrae variables (RRLs) available to date. We estimated abundances using both high-resolution and low-resolution (ΔS method) spectra for fundamental (RRab) and first overtone (RRc) RRLs. The iron abundances for 7941 RRLs were supplemented with similar estimates that are …
Solo dwarfs - III. Exploring the orbital origins of isolated Local Group galaxies with Gaia Data Release 2
Lewis, Geraint F.; McConnachie, Alan W.; Venn, Kim A. +4 more
We measure systemic proper motions for distant dwarf galaxies in the Local Group and investigate if these isolated galaxies have ever had an interaction with the Milky Way or M31. We cross-match photometry of isolated, star-forming, dwarf galaxies in the Local Group, taken as part of the Solo survey, with astrometric measurements from Gaia Data Re…