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KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z ∼ 1.4-2.6
Alexander, D. M.; Mainieri, V.; Cirasuolo, M. +9 more
As part of our KMOS AGN Survey at High-redshift (KASHz), we present spatially resolved VLT/KMOS and VLT/SINFONI spectroscopic data and ALMA 870 µm continuum imaging of eight z = 1.4-2.6 moderate AGN (L_{2-10 kev} = 1042-1045 ergs s-1). We map [O III], H α and rest-frame FIR emission to search for any spatial …
Spitzer Follow-up of Extremely Cold Brown Dwarfs Discovered by the Backyard Worlds: Planet 9 Citizen Science Project
Debes, John H.; Kiman, Rocio; Meisner, Aaron M. +38 more
We present Spitzer follow-up imaging of 95 candidate extremely cold brown dwarfs discovered by the Backyard Worlds: Planet 9 citizen science project, which uses visually perceived motion in multiepoch Wide-field Infrared Survey Explorer (WISE) images to identify previously unrecognized substellar neighbors to the Sun. We measure Spitzer [3.6]-[4.5…
Detection of Strong Epicyclic Density Spikes in the GD-1 Stellar Stream: An Absence of Evidence for the Influence of Dark Matter Subhalos?
Martin, Nicolas; Malhan, Khyati; Famaey, Benoit +3 more
The density variations in thin stellar streams may encode important information on the nature of dark matter. For instance, if dark matter aggregates into massive subhalos, these perturbers are expected to scatter stars out of dynamically cold stellar streams, possibly leading to detectable gaps in those structures. Here, we reexamine the density …
Slicing the cool circumgalactic medium along the major axis of a star-forming galaxy at z = 0.7
Dahle, H.; Rigby, J. R.; Bayliss, M. B. +13 more
We present spatially resolved Echelle spectroscopy of an intervening Mg II-Fe II-Mg I absorption-line system detected at zabs = 0.73379 towards the giant gravitational arc PSZ1 G311.65-18.48. The absorbing gas is associated with an inclined disc-like star-forming galaxy, whose major axis is aligned with the two arc-segments reported her…
Chemo-dynamical properties of the Anticenter Stream: a surviving disc fossil from a past satellite interaction.
Laporte, Chervin F. P.; Belokurov, Vasily; Hill, Vanessa +2 more
Using Gaia DR2, we trace the Anticenter Stream (ACS) in various stellar populations across the sky and find that it is kinematically and spatially decoupled from the Monoceros Ring. Using stars from LAMOST and SEGUE, we show that the ACS is systematically more metal-poor than Monoceros by 0.1 dex with indications of a narrower metallicity spread. …
Uncovering a 260 pc wide, 35-Myr-old filamentary relic of star formation
Boffin, Henri M. J.; Jerabkova, Tereza; Beccari, Giacomo
Several recent studies have shown that the Vela OB2 region hosts a complex constellation of sub-populations with ages in the range 10 to 50 Myr. Such populations might represent the best example of the outcome of clustered star formation in giant molecular clouds (GMCs). We use Gaia DR2 data over an area of 40 deg radius around the open cluster Co…
Pulsation among TESS A and B stars and the Maia variables
Balona, L. A.; Ozuyar, D.
Classification of over 50 000 TESS stars in sectors 1-18 has resulted in the detection of 766 pulsating main-sequence B stars as well as over 5000 δ Scuti, 2300 γ Doradus, and 114 roAp candidates. Whereas it has been assumed that high-frequency pulsations among B-type main-sequence stars are confined to the early B-type β Cephei stars, the observa…
Ubiquitous Molecular Outflows in z > 4 Massive, Dusty Galaxies. I. Sample Overview and Clumpy Structure in Molecular Outflows on 500 pc Scales
Gonzalez, Anthony H.; Phadke, Kedar A.; Aravena, Manuel +14 more
Massive galaxy-scale outflows of gas are one of the most commonly invoked mechanisms to regulate the growth and evolution of galaxies throughout the universe. While the gas in outflows spans a large range of temperatures and densities, the cold molecular phase is of particular interest because molecular outflows may be capable of suppressing star …
Current Population Statistics Do Not Favor Photoevaporation over Core-powered Mass Loss as the Dominant Cause of the Exoplanet Radius Gap
Loyd, R. O. Parke; Peacock, Sarah; Richey-Yowell, Tyler +4 more
We search for evidence of the cause of the exoplanet radius gap, I.e., the dearth of planets with radii near 1.8 R⊕. If the cause were photoevaporation, the radius gap should trend with proxies for the early-life high-energy emission of the planet-hosting stars. If, alternatively, the cause were core-powered mass loss, no such trends sh…
ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3
Drossart, Pierre; Beaulieu, Jean-Philippe; Changeat, Quentin +24 more
We present the analysis of the hot-Jupiter KELT-7 b using transmission and emission spectroscopy from the Hubble Space Telescope, both taken with the Wide Field Camera 3. Our study uncovers a rich transmission spectrum that is consistent with a cloud-free atmosphere and suggests the presence of H2O and H-. In contrast, the ex…