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Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327-2326
Placco, Vinicius M.; Tominaga, Nozomu; Nomoto, Ken'ichi +6 more
We present observational evidence that an aspherical supernova explosion could have occurred in the first stars in the early universe. Our results are based on the first determination of a Zn abundance in a Hubble Space Telescope/Cosmic Origins Spectrograph high-resolution UV spectrum of a hyper-metal-poor (HMP) star, HE 1327-2326, with {{[Fe/H]}}…
Water vapor detection in the transmission spectra of HD 209458 b with the CARMENES NIR channel
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +31 more
Aims: We aim at detecting water vapor in the atmosphere of the hot Jupiter HD 209458 b and perform a multi-band study in the near infrared with CARMENES.
Methods: The water vapor absorption lines from the atmosphere of the planet are Doppler-shifted due to the large change in its radial velocity during transit. This shift is of the order…
Ring structure in the MWC 480 disk revealed by ALMA
Pascucci, Ilaria; Banzatti, Andrea; Herczeg, Gregory J. +20 more
Gap-like structures in protoplanetary disks are likely related to planet formation processes. In this paper, we present and analyze high-resolution (0.17''× 0.11'') 1.3 mm ALMA continuum observations of the protoplanetary disk around the Herbig Ae star MWC 480. Our observations show for the first time a gap centered at 74 au with a width of 23 au,…
SI IV Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations
Kerr, Graham S.; Carlsson, Mats; Young, Peter R. +2 more
The Interface Region Imaging Spectrograph routinely observes the Si IV resonance lines. When analyzing quiescent observations of these lines, it has typically been assumed that they form under optically thin conditions. This is likely valid for the quiescent Sun, but this assumption has also been applied to the more extreme flaring scenario. We us…
PynPoint: a modular pipeline architecture for processing and analysis of high-contrast imaging data
Quanz, S. P.; Amara, A.; Stolker, T. +4 more
Context. The direct detection and characterization of planetary and substellar companions at small angular separations is a rapidly advancing field. Dedicated high-contrast imaging instruments deliver unprecedented sensitivity, enabling detailed insights into the atmospheres of young low-mass companions. In addition, improvements in data reduction…
The ALMA Spectroscopic Survey in the HUDF: Nature and Physical Properties of Gas-mass Selected Galaxies Using MUSE Spectroscopy
Carilli, Chris; Somerville, Rachel S.; Bacon, Roland +31 more
We discuss the nature and physical properties of gas-mass selected galaxies in the ALMA spectroscopic survey (ASPECS) of the Hubble Ultra Deep Field (HUDF). We capitalize on the deep optical integral-field spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) HUDF Survey and multiwavelength data to uniquely associate all 16 line emitters,…
Validation of the Alfvén Wave Solar Atmosphere Model (AWSoM) with Observations from the Low Corona to 1 au
van der Holst, Bart; Lamy, Philippe; Vásquez, Alberto M. +9 more
We perform a validation study of the latest version of the Alfvén Wave Solar atmosphere Model (AWSoM) within the Space Weather Modeling Framework. To do so, we compare the simulation results of the model with a comprehensive suite of observations for Carrington rotations representative of the solar minimum conditions extending from the solar coron…
Emergence of the Gaia phase space spirals from bending waves
Widrow, Lawrence M.; Darling, Keir
We discuss the physical mechanism by which pure vertical bending waves in a stellar disc evolve to form phase space spirals similar to those discovered by Antoja et al. in Gaia Data Release 2. These spirals are found by projecting Solar Neighbourhood stars on to the z-vz plane. Faint spirals appear in the number density of stars project…
On the nature and physical conditions of the luminous Ly α emitter CR7 and its rest-frame UV components
Ferrara, Andrea; Schaerer, Daniel; Sobral, David +6 more
We present new Hubble Space Telescope (HST)/WFC3 observations and re-analyse VLT data to unveil the continuum, variability, and rest-frame ultraviolet (UV) lines of the multiple UV clumps of the most luminous Ly α emitter at z = 6.6, CR7 (COSMOS Redshift 7). Our re-reduced, flux-calibrated X-SHOOTER spectra of CR7 reveal an He II emission line in …
A Catalog of OB Stars from LAMOST Spectroscopic Survey
Zhao, Gang; Huang, Yang; Liu, Chao +3 more
We present 22,901 OB spectra of 16,032 stars identified from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 5 data set. A larger sample of OB candidates are first selected from the distributions in the spectral line indices’ space. Then, all 22,901 OB spectra are identified by manual inspection. Based on a subsample val…