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Rings and arcs around evolved stars - II. The Carbon Star AFGL 3068 and the Planetary Nebulae NGC 6543, NGC 7009, and NGC 7027
Balick, B.; Guerrero, M. A.; Toalá, J. A. +2 more
We present a detailed comparative study of the arcs and fragmented ring-like features in the haloes of the planetary nebulae (PNe) NGC 6543, NGC 7009, and NGC 7027 and the spiral pattern around the carbon star AFGL 3068 using high-quality multi-epoch HST images. This comparison allows us to investigate the connection and possible evolution between…
Models of distorted and evolving dark matter haloes
Erkal, Denis; Vasiliev, Eugene; Evans, N. Wyn +2 more
We investigate the ability of basis function expansions to reproduce the evolution of a Milky Way-like dark matter halo, extracted from a cosmological zoom-in simulation. For each snapshot, the density of the halo is reduced to a basis function expansion, with interpolation used to recreate the evolution between snapshots. The angular variation of…
A new take on the low-mass brown dwarf companions on wide orbits in Upper-Scorpius
Bayo, A.; Babusiaux, C.; Janson, M. +10 more
Context. The Upper-Scorpius association (5-11 Myr) contains a unique population of low-mass (M ≤ 30MJup) brown dwarfs either free-floating, forming wide pairs, or on wide orbits around solar-type and massive stars. The detailed relative characterization of their physical properties (mass, radius, temperature, composition, and ongoing ac…
ALMA and VLA reveal the lukewarm chromospheres of the nearby red supergiants Antares and Betelgeuse
Ryde, N.; Feeney-Johansson, A.; Lim, J. +8 more
We first present spatially resolved ALMA and VLA continuum observations of the early-M red supergiant Antares to search for the presence of a chromosphere at radio wavelengths. We resolve the free-free emission of the Antares atmosphere at 11 unique wavelengths between 0.7 mm (ALMA band 8) and 10 cm (VLA S band). The projected angular diameter is …
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. II. The Most Energetic Quasar Outflow Measured to Date
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
We present a study of the BAL outflows seen in quasar SDSS J1042+1646 (z = 0.978) in the rest-frame 500-1050 Å (EUV500) region. The results are based on the analysis of recent Hubble Space Telescope/Cosmic Origins Spectrograph observations. Five outflow systems are identified, where, in total, they include ∼70 outflow troughs from ionic transition…
Disc-binary interactions in depleted post-AGB binaries
Van Winckel, Hans; Nelemans, Gijs; Pols, Onno +1 more
Binary post-asymptotic giant branch (post-AGB) stars have orbital periods in the range of 100-2500 days in eccentric orbits. They are surrounded by circumbinary dusty discs. They are the immediate result of unconstrained binary interaction processes. Their observed orbital properties do not correspond to model predictions: Neither the periods nor …
hybrid-LENSTOOL: a self-consistent algorithm to model galaxy clusters with strong- and weak-lensing simultaneously
Richard, Johan; Kneib, Jean-Paul; Sharon, Keren +5 more
We present a new galaxy cluster lens modelling approach, hybrid-LENSTOOL, that is implemented in the publicly available modelling software LENSTOOL. hybrid-LENSTOOL combines a parametric approach to model the core of the cluster, and a non-parametric (free-form) approach to model the outskirts. hybrid-LENSTOOL optimizes both strong- and weak-lensi…
The case for strangulation in low-mass hosts: DDO 113
Kochanek, Christopher S.; Sand, David J.; Peter, Annika H. G. +2 more
We investigate the case for environmental quenching of the Fornax-mass satellite DDO 113, which lies only 9 kpc in projection from its host, the Large-Magellanic-Cloud-mass galaxy NGC 4214. DDO 113 was quenched about 1 Gyr ago and is virtually gas-free, while analogs in the field are predominantly star-forming and gas-rich. We use deep imaging obt…
Spectroscopic Orbits of 11 Nearby, Mid-to-late M-dwarf Binaries
Latham, David W.; Berlind, Perry; Calkins, Michael L. +7 more
We present the spectroscopic orbits of 11 nearby, mid-to-late M dwarf binary systems in a variety of configurations: 2 single-lined binaries (SB1s), 7 double-lined binaries (SB2s), 1 double-lined triple (ST2), and 1 triple-lined triple (ST3). Eight of these orbits are the first published for these systems, while five are newly identified multiples…
A new method for measuring the meteor mass index: application to the 2018 Draconid meteor shower outburst
Vida, D.; Campbell-Brown, M.; Brown, P. G. +2 more
Context. Several authors predicted an outburst of the Draconid meteor shower in 2018, but with an uncertain level of activity.
Aims: Optical meteor observations were used to derive the population and mass indices, flux, and radiant positions of Draconid meteors.
Methods: We performed 90 min of multi-station observations after the predict…