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In-depth study of moderately young but extremely red, very dusty substellar companion HD 206893B
Rouan, D.; Absil, O.; Henning, T. +47 more
Context. The substellar companion HD 206893b has recently been discovered by direct imaging of its disc-bearing host star with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument.
Aims: We investigate the atypical properties of the companion, which has the reddest near-infrared colours among all known substellar obje…
X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts
Göğüş, Ersin; Kouveliotou, Chryssa; Lin, Lin +10 more
We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail…
A Multiple Flux-tube Solar Wind Model
Rouillard, Alexis P.; Pinto, Rui F.
We present a new model, MULTI-VP, which computes the three-dimensional structure of the solar wind and includes the chromosphere, the transition region, and the corona and low heliosphere. MULTI-VP calculates a large ensemble of wind profiles flowing along open magnetic field lines that sample the entire three-dimensional atmosphere or, alternativ…
The evolving far-IR galaxy luminosity function and dust-obscured star formation rate density out to z≃5.
Scott, D.; McLure, R. J.; Dunlop, J. S. +5 more
We present a new measurement of the evolving galaxy far-IR luminosity function (LF) extending out to redshifts z ≃ 5, with resulting implications for the level of dust-obscured star formation density in the young Universe. To achieve this, we have exploited recent advances in sub-mm/mm imaging with SCUBA-2 on the James Clerk Maxwell Telescope and …
The Circumstellar Disk HD 169142: Gas, Dust, and Planets Acting in Concert?
Pinte, C.; Ménard, F.; van der Plas, G. +34 more
HD 169142 is an excellent target for investigating signs of planet-disk interaction due to previous evidence of gap structures. We perform J-band (∼1.2 µm) polarized intensity imaging of HD 169142 with VLT/SPHERE. We observe polarized scattered light down to 0.″16 (∼19 au) and find an inner gap with a significantly reduced scattered-light fl…
Lens models under the microscope: comparison of Hubble Frontier Field cluster magnification maps
Coe, Dan; Liesenborgs, Jori; Williams, Liliya L. R. +2 more
Using the power of gravitational lensing magnification by massive galaxy clusters, the Hubble Frontier Fields provide deep views of six patches of the high-redshift Universe. The combination of deep Hubble imaging and exceptional lensing strength has revealed the greatest numbers of multiply-imaged galaxies available to constrain models of cluster…
Exploring Dust around HD 142527 down to 0.″025 (4 au) Using SPHERE/ZIMPOL
Ménard, F.; Quanz, S. P.; Avenhaus, H. +25 more
We have observed the protoplanetary disk of the well-known young Herbig star HD 142527 using ZIMPOL polarimetric differential imaging with the very broad band (∼600-900 nm) filter. We obtained two data sets in 2015 May and 2016 March. Our data allow us to explore dust scattering around the star down to a radius of ∼0.″025 (∼4 au). The well-known o…
The high-Eddington NLS1 Ark 564 has the coolest corona
Fabian, A. C.; Reynolds, C. S.; Lohfink, A. +4 more
Ark 564 is an archetypal narrow-line Seyfert 1 that has been well observed in soft X-rays from 0.3-10 keV, revealing a steep spectrum, strong soft excess, iron K emission line and dramatic variability on the order of hours. Because of its very steep spectrum, observations of the source above 10 keV have been sparse. We report here on the first NuS…
A closer look at the `characteristic' width of molecular cloud filaments
Panopoulou, G. V.; Tassis, K.; Skalidis, R. +2 more
Filaments in Herschel molecular cloud images are found to exhibit a 'characteristic width'. This finding is in tension with spatial power spectra of the data, which show no indication of this characteristic scale. We demonstrate that this discrepancy is a result of the methodology adopted for measuring filament widths. First, we perform the previo…
ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments
Cooper, M. C.; van Kampen, E.; Demarco, R. +16 more
We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes wi…