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A Word to the WISE: Confusion is Unavoidable for WISE-selected Infrared Excesses
Debes, John H.; Gentile Fusillo, Nicola Pietro; Farihi, Jay +1 more
Stars with excess infrared radiation from circumstellar dust are invaluable for studies of exoplanetary systems, informing our understanding of processes of planet formation and destruction alike. All-sky photometric surveys have made the identification of dusty infrared excess candidates trivial, however, samples that rely on data from Wise Infra…
Probing the circumstellar medium 2.8 Gyr after the big bang: detection of Bowen fluorescence in the Sunburst arc
Castellano, M.; Grillo, C.; Brammer, G. B. +13 more
We discovered Bowen emission arising from a strongly lensed (i.e. with magnification factor µ > 20) source hosted in the Sunburst arc at z = 2.37. We claim this source is plausibly a transient stellar object and study the unique ultraviolet lines emerging from it. In particular, narrow (σv ≃ 40 km s-1) ionization lin…
Stellar parameter determination from photometry using invertible neural networks
Gennaro, Mario; Sabbi, Elena; Gouliermis, Dimitrios +7 more
Photometric surveys with the Hubble Space Telescope (HST) allow us to study stellar populations with high-resolution and deep coverage, with estimates of the physical parameters of the constituent stars being typically obtained by comparing the survey data with adequate stellar evolutionary models. This is a highly non-trivial task due to effects …
Cosmic evolution of star-forming galaxies to z ≃ 1.8 in the faint low-frequency radio source population
Prandoni, I.; Vaccari, M.; Mancuso, C. +4 more
We study the properties of star-forming galaxies selected at 610 MHz with the GMRT in a survey covering ∼1.86 deg2 down to a noise of ∼7.1 µJy beam-1. These were identified by combining multiple classification diagnostics: optical, X-ray, infrared, and radio data. Of the 1685 SFGs from the GMRT sample, 496 have spectros…
Discovery of a Large Population of Nitrogen-enhanced Stars in the Magellanic Clouds
Beers, Timothy C.; Placco, Vinicius M.; Minniti, Dante +7 more
We report the APOGEE-2S+ discovery of a unique collection of nitrogen-enhanced mildly metal-poor giant stars, peaking at [Fe/H] ∼ -0.89 with no carbon enrichment, toward the Small and Large Magellanic Clouds (SMC and LMC), with abundances of light- (C, N), odd-Z (Al, K), and α-elements (O, Mg, Si) that are typically found in Galactic globular clus…
Fast Outflows in Hot Dust-obscured Galaxies Detected with Keck/NIRES
Tsai, Chao-Wei; Moon, Dae-Sik; Jun, Hyunsung D. +10 more
We present rest-frame optical spectroscopic observations of 24 Hot Dust-Obscured Galaxies (Hot DOGs) at redshifts 1.7-4.6 with KECK/NIRES. Our targets are selected, based on their extreme red colors, to be the highest-luminosity sources from the WISE infrared survey. In 20 sources with well-detected emission, we fit the key [O III], Hβ, Hα, [N II]…
Characterization of the K2-38 planetary system. Unraveling one of the densest planets known to date
Bouchy, F.; Rebolo, R.; Pallé, E. +90 more
Context. An accurate characterization of the known exoplanet population is key to understanding the origin and evolution of planetary systems. Determining true planetary masses through the radial velocity (RV) method is expected to experience a great improvement thanks to the availability of ultra-stable echelle spectrographs.
Aims: We took a…
Real-time Flare Prediction Based on Distinctions between Flaring and Non-flaring Active Region Spectra
Kleint, Lucia; Panos, Brandon
With machine learning entering into the awareness of the heliophysics community, solar flare prediction has become a topic of increased interest. Although machine-learning models have advanced with each successive publication, the input data has remained largely fixed on magnetic features. Despite this increased model complexity, results seem to i…
The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5-455510
Whitten, Devin D.; Beers, Timothy C.; Placco, Vinicius M. +14 more
We report on the spectroscopic analysis of RAVE J183013.5-455510, an extremely metal-poor star, highly enhanced in CNO, and with discernible contributions from the rapid neutron-capture process. There is no evidence of binarity for this object. At $[\mathrm{Fe}/{\rm{H}}]$ = -3.57, this star has one of the lowest metallicities currently observed, w…
A large, deep 3 deg2 survey of H α, [O III], and [O II] emitters from LAGER: constraining luminosity functions
Hu, W.; Infante, L.; Walker, A. R. +14 more
We present our measurements of the H α, [O III], and [O II] luminosity functions as part of the Lyman Alpha Galaxies at Epoch of Reionization (LAGER) survey using our samples of 1577 z = 0.47 H α-, 3933 z = 0.93 [O III]-, and 5367 z = 1.59 [O II]-selected emission line galaxies in a 3 deg2 single, CTIO/Blanco DECam pointing of the COSMO…