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Detailed chemical compositions of planet-hosting stars - I. Exploration of possible planet signatures
Spina, L.; Yong, D.; Asplund, M. +5 more
We present a line-by-line differential analysis of a sample of 16 planet-hosting stars and 68 comparison stars using high-resolution, high signal-to-noise ratio spectra gathered using Keck. We obtained accurate stellar parameters and high-precision relative chemical abundances with average uncertainties in Teff, log g, [Fe/H], and [X/H]…
On the AGN Nature of Two UV-bright Sources at zspec ∼ 5.5 in the CANDELS Fields: An Update on the AGN Space Density at M1450 ∼ -22.5
Dickinson, M.; Fiore, F.; Grazian, A. +8 more
It is widespread opinion that hydrogen reionization is mainly driven by primeval star-forming galaxies, with high-z active galactic nuclei (AGNs) having a minor role. Recent observations, however, challenge this notion, indicating a number of issues related to a galaxy-driven reionization scenario. We provide here an updated assessment of the spac…
A census of coronal mass ejections on solar-like stars
Lammer, H.; Guenther, E. W.; Kriskovics, L. +8 more
Coronal mass ejections (CMEs) may have major importance for planetary and stellar evolution. Stellar CME parameters, such as mass and velocity, have yet not been determined statistically. So far only a handful of stellar CMEs has been detected mainly on dMe stars using spectroscopic observations. We therefore aim for a statistical determination of…
Delay Time Distributions of Type Ia Supernovae from Galaxy and Cosmic Star Formation Histories
Pacifici, Camilla; Graur, Or; Strolger, Louis-Gregory +2 more
We present analytical reconstructions of SN Ia delay time distributions (DTDs) by way of two independent methods: by a Markov Chain Monte Carlo best-fit technique comparing the volumetric SN Ia rate history to today's compendium cosmic star formation history, and second through a maximum likelihood analysis of the star formation rate histories of …
A Systematic Study of the Dust of Galactic Supernova Remnants. I. The Distance and the Extinction
Jiang, Biwei; Chen, Bingqiu; Zhao, He +3 more
By combining the photometric, spectroscopic, and astrometric information of the stars in the sightline of supernova remnants (SNRs), the distances to and the extinctions of 32 Galactic SNRs are investigated. The stellar atmospheric parameters are from the Sloan Digital Sky Survey-DR14/Apache Point Observatory Galaxy Evolution Experiment and Large …
Magnetic reconnection in partially ionized plasmas
Ni, Lei; Murphy, Nicholas A.; Ji, Hantao +1 more
Magnetic reconnection has been intensively studied in fully ionized plasmas. However, plasmas are often partially ionized in astrophysical environments. The interactions between the neutral particles and ionized plasmas might strongly affect the reconnection mechanisms. We review magnetic reconnection in partially ionized plasmas in different envi…
Aluminium oxide in the atmosphere of hot Jupiter WASP-43b
Helling, Christiane; Chubb, Katy L.; Min, Michiel +2 more
We have conducted a re-analysis of publicly available Hubble Space Telescope Wide Field Camera 3 (HST WFC3) transmission data for the hot-Jupiter exoplanet WASP-43b, using the Bayesian retrieval package Tau-REx. We report evidence of AlO in transmission to a high level of statistical significance (>5σ in comparison to a flat model, and 3.4σ in …
On the black hole content and initial mass function of 47 Tuc
Balbinot, E.; Hénault-Brunet, V.; Gieles, M. +3 more
The globular cluster (GC) 47 Tuc has recently been proposed to host an intermediate-mass black hole (IMBH) or a population of stellar mass black holes (BHs). To shed light on its dark content, we present an application of self-consistent multimass models with a varying mass function and content of stellar remnants, which we fit to various observat…
Strong chemical tagging with APOGEE: 21 candidate star clusters that have dissolved across the Milky Way disc
Cohen, Roger E.; Bovy, Jo; Brownstein, Joel R. +12 more
Chemically tagging groups of stars born in the same birth cluster is a major goal of spectroscopic surveys. To investigate the feasibility of such strong chemical tagging, we perform a blind chemical tagging experiment on abundances measured from APOGEE survey spectra. We apply a density-based clustering algorithm to the 8D chemical space defined …
Neutrino clustering in the Milky Way and beyond
Lesgourgues, J.; de Salas, P. F.; Gariazzo, S. +3 more
The standard cosmological model predicts the existence of a Cosmic Neutrino Background, which has not yet been observed directly. Some experiments aiming at its detection are currently under development, despite the tiny kinetic energy of the cosmological relic neutrinos, which makes this task incredibly challenging. Since massive neutrinos are at…