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SUPER. V. ALMA continuum observations of z ∼ 2 AGN and the elusive evidence of outflows influencing star formation
Alexander, D. M.; Fiore, F.; Marconi, A. +24 more
We study the impact of active galactic nuclei (AGN) ionised outflows on star formation in high-redshift AGN host galaxies, by combining near-infrared integral field spectroscopic (IFS) observations, mapping the Hα emission and [O III]λ5007 outflows, with matched-resolution observations of the rest-frame far-infrared (FIR) emission. We present high…
Gaia view of a stellar sub-structure in front of the Small Magellanic Cloud
de Grijs, Richard; Cioni, Maria-Rosa L.; Bekki, Kenji +6 more
Recent observational studies identified a foreground stellar sub-structure traced by red clump (RC) stars (∼12 kpc in front of the main body) in the eastern regions of the Small Magellanic Cloud (SMC) and suggested that it formed during the formation of the Magellanic Bridge (MB), due to the tidal interaction of the Magellanic Clouds. Previous stu…
LAMOST J0140355 + 392651: an evolved cataclysmic variable donor transitioning to become an extremely low-mass white dwarf
Xiang, Maosheng; Rix, Hans-Walter; El-Badry, Kareem +6 more
We present LAMOST J0140355 + 392651 (hereafter J0140), a close (Porb = 3.81 h) binary containing a bloated, low-mass ($M \approx 0.15 \, \mathrm{M}_{\odot }$) proto-white dwarf (WD) and a massive ($M \approx 0.95\, \mathrm{M}_{\odot }$) WD companion. The system's optical light curve is dominated by large-amplitude ellipsoidal variabilit…
Targeting Bright Metal-poor Stars in the Disk and Halo Systems of the Galaxy
Casey, Andrew R.; Beers, Timothy C.; Lee, Young Sun +7 more
We present the results of spectroscopic follow-up for 1897 low-metallicity star candidates, selected from the Best & Brightest (B&B) Survey, carried out with the GMOS-N/S (Gemini North/South telescopes) and Goodman (SOAR Telescope) spectrographs. From these low-resolution (R ∼ 2000) spectra, we estimate stellar atmospheric parameters, as w…
A Coplanar Circumbinary Protoplanetary Disk in the TWA 3 Triple M Dwarf System
Duchêne, Gaspard; Andrews, Sean M.; Czekala, Ian +5 more
We present sensitive ALMA observations of TWA 3, a nearby, young (∼10 Myr) hierarchical system composed of three pre-main-sequence M3-M4.5 stars. For the first time, we detected 12CO and 13CO J = 2-1 emissions from the circumbinary protoplanetary disk around TWA 3A. We jointly fit the protoplanetary disk velocity field, stell…
The age of the carina young association and potential membership of HD 95086
Booth, Mark; del Burgo, Carlos; Hambaryan, Valeri V.
Carina is a nearby young stellar association. So far, only a small number of stars have been clearly identified as members of this association. In this paper, we reanalyse the membership of the association in light of Gaia DR2 data, in particular finding that HD 95086 is a potential member (probability of 71 per cent). This star is noteworthy as o…
Forbidden hugs in pandemic times. II. The luminous red nova variety: AT 2020hat and AT 2020kog
Lundqvist, P.; Reichart, D. E.; Rest, A. +32 more
We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend of slow luminosity rise, lasting at least a few months. The subsequent major LRN outbursts w…
Photometric, polarimetric, and spectroscopic studies of the luminous, slow-decaying Type Ib SN 2012au
Pandey, S. B.; Ochner, P.; Benetti, S. +15 more
Optical, near-infrared (NIR) photometric and spectroscopic studies, along with the optical imaging polarimetric results for SN 2012au, are presented in this article to constrain the nature of the progenitor and other properties. Well-calibrated multiband optical photometric data (from -0.2 to +413 d since B-band maximum) were used to compute the b…
Detailed elemental abundances of binary stars: searching for signatures of planet formation and atomic diffusion
Bitsch, Bertram; Ting, Yuan-Sen; Murphy, Michael T. +5 more
Binary star systems are assumed to be co-natal and coeval, and thus to have identical chemical composition. In this work, we aim to test the hypothesis that there is a connection between observed element abundance patterns and the formation of planets using binary stars. Moreover, we also want to test how atomic diffusion might influence the obser…
Deciphering the evolution of the Milky Way discs: Gaia APOGEE Kepler giant stars and the Besançon Galaxy Model
Anders, F.; Chiappini, C.; Figueras, F. +13 more
Context. Thanks to ongoing efforts to compute accurate stellar ages, we are able to characterise stars in different regions of the Milky Way. The Gaia and Kepler space-missions, along with ground-based spectroscopic surveys such as APOGEE, provide a unique way to study the chemo-kinematics relations as a function of age through the Galactic stella…