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Streamlined lensed quasar identification in multiband images via ensemble networks
Eilers, Anna-Christina; Yue, Minghao; Suyu, Sherry H. +6 more
Quasars experiencing strong lensing offer unique viewpoints on subjects related to the cosmic expansion rate, the dark matter profile within the foreground deflectors, and the quasar host galaxies. Unfortunately, identifying them in astronomical images is challenging since they are overwhelmed by the abundance of non-lenses. To address this, we ha…
The DEHVILS survey overview and initial data release: high-quality near-infrared Type Ia supernova light curves at low redshift
Jones, David O.; Riess, Adam G.; Shappee, Benjamin J. +17 more
While the sample of optical Type Ia supernova (SN Ia) light curves (LCs) usable for cosmological parameter measurements surpasses 2000, the sample of published, cosmologically viable near-infrared (NIR) SN Ia LCs, which have been shown to be good 'standard candles,' is still ≲ 200. Here, we present high-quality NIR LCs for 83 SNe Ia ranging from 0…
Combing the brown dwarf desert with Gaia DR3
Barstow, Joanna K.; Stevenson, Adam T.; Haswell, Carole A. +1 more
We have created an up-to-date catalogue of 214 brown dwarfs (BDs) in binaries with P < 104 d. This allows us to examine the population statistics of the BD desert. We searched Gaia third data release (DR3) non-single star (NSS) results for orbital inclinations of BD candidates, deriving 12 new masses. Three remain as desert BDs where…
GAMA/DEVILS: cosmic star formation and AGN activity over 12.5 billion years
Holwerda, Benne; Bland-Hawthorn, Joss; D'Silva, Jordan C. J. +11 more
We use the Galaxy and Mass Assembly (GAMA) and the Deep Extragalactic Visible Legacy Survey (DEVILS) observational data sets to calculate the cosmic star formation rate (SFR) and active galactic nuclei (AGN) bolometric luminosity history (CSFH/CAGNH) over the last 12.5 billion years. SFRs and AGN bolometric luminosities were derived using the spec…
300: An ACA 870 µm Continuum Survey of Orion Protostars and Their Evolution
Narang, Mayank; Pokhrel, Riwaj; Fischer, William J. +11 more
We present an 870 µm continuum survey of 300 protostars from the Herschel Orion Protostar Survey using the Atacama Compact Array (ACA). These data measure protostellar flux densities on envelope scales ≤8000 au (20″) and resolve the structure of envelopes with 1600 au (4″) resolution, a factor of 3-5 improvement in angular resolution over ex…
The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf
Kiman, Rocio; Faherty, Jacqueline K.; Gagné, Jonathan +5 more
We report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2-50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57-531906.1 AB (Luhman 16 AB) at a distance of 2 pc, whi…
HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star
Kostov, Veselin B.; Torres, Guillermo; Vanderburg, Andrew +42 more
We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large (R b = ${1.580}_{-0.070}^{+0.074}$ R J) brown dwarf on a highly eccentric (e = ${0.560}_{-0.031}^{+0.029}$ ) orbit …
A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +13 more
Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise extremely difficult to directly observe at high redshift from ground-based telescopes. Here, we present the spectral analysis of two lensed, quiescent galaxies at z ≳ 1 di…
Impact of the Galactic bar on tidal streams within the Galactic disc. The case of the tidal stream of the Hyades
Laporte, Chervin F. P.; de Laverny, Patrick; Famaey, Benoit +5 more
Tidal streams of disrupted clusters are powerful probes of the gravitational potential of the Galaxy and they are routinely detected in the stellar halo of the Milky Way. It was recently shown that tidal streams of open clusters can now also be detected within the Milky Way disc. In this work, we highlight the fact that disc tidal streams also pro…
The formation history of our Galaxy's nuclear stellar disc constrained from HST observations of the Quintuplet field
Rich, R. M.; Lu, J.; Nogueras-Lara, F. +9 more
Context. Until recently it was thought that the nuclear stellar disc at the centre of our Galaxy was formed via quasi-continuous star formation over billions of years. However, an analysis of GALACTICNUCLEUS survey data indicates that > 80% of the mass of the stellar disc formed at least 8 Gyr ago and about 5% roughly 1 Gyr ago.
Aims: Our …