Search Publications
Probing the properties of relic neutrinos using the cosmic microwave background, the Hubble Space Telescope and galaxy clusters
Nunes, Rafael C.; Bonilla, Alexander
We investigate the observational constraints on the cosmic neutrino background (CNB) given by the extended ΛCDM scenario (ΛCDM + N_eff + \sum m_{ν } + c^2_eff + c^2_vis + ξ _{ν }) using the latest observational data from the cosmic microwave background (CMB) as observed by Planck (i.e. temperature power spectrum, low-polarization and lensing recon…
Subsurface Zonal and Meridional Flow During Cycles 23 and 24
Howe, R.; Komm, R.; Hill, F.
We study the solar-cycle variation of subsurface flows from the surface to a depth of 16 Mm. We have used ring-diagram analysis to analyze Dopplergrams obtained with the Michelson Doppler Imager (MDI) Dynamics Program, the Global Oscillation Network Group (GONG), and the Helioseismic and Magnetic Imager (HMI) instrument. We combined the zonal and …
Anatomy of the massive star-forming region S106. The [O I] 63 µm line observed with GREAT/SOFIA as a versatile diagnostic tool for the evolution of massive stars
Comerón, F.; Schneider, N.; Csengeri, T. +9 more
The central area (40″ × 40″) of the bipolar nebula S106 was mapped in the [O I] line at 63.2 µm (4.74 THz) with high angular (6″) and spectral (0.24 MHz) resolution, using the GREAT heterodyne receiver on board SOFIA. The spatial and spectral emission distribution of [O I] is compared to emission in the CO 16 →15, [C II] 158 µm, and CO…
High-energy environment of super-Earth 55 Cancri e. I. Far-UV chromospheric variability as a possible tracer of planet-induced coronal rain
Ehrenreich, D.; Lecavelier des Etangs, A.; Udry, S. +7 more
The high-energy X-ray to ultraviolet (XUV) irradiation of close-in planets by their host star influences their evolution and might be responsible for the existence of a population of ultra-short period planets eroded to their bare core. In orbit around a bright, nearby G-type star, the super-Earth 55 Cnc e offers the possibility to address these i…
The Arches cluster revisited. I. Data presentation and stellar census
Martins, F.; Najarro, F.; Clark, J. S. +2 more
Context. Located within the central region of the Galaxy, the Arches cluster appears to be one of the youngest, densest, and most massive stellar aggregates within the Milky Way. As such, it has the potential to be uniquely instructive laboratory for the study of star formation in extreme environments and the physics of very massive stars.
Ai…
The z = 0.54 LoBAL Quasar SDSS J085053.12+445122.5. I. Spectral Synthesis Analysis Reveals a Massive Outflow
Gallagher, Sarah C.; Terndrup, Donald M.; Leighly, Karen M. +2 more
We introduce SimBAL, a novel spectral-synthesis procedure that uses grids of ionic column densities generated by the photoionization code Cloudy and a Bayesian model calibration to forward-model broad absorption-line quasar (BALQ) spectra. We used SimBAL to analyze the Hubble Space Telescope Cosmic Origins Spectrograph (COS) spectrum of the low-re…
A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction
Zhao, Gang; Zhao, Jing-Kun; Huang, Yang +11 more
In this paper, we report the discovery of a new late-B-type unbound hyper-runaway star (LAMOST-HVS4) from the LAMOST spectroscopic surveys. According to its atmospheric parameters, it is either a B-type main-sequence (MS) star or a blue horizontal branch (BHB) star. Its Galactocentric distance and velocity are 30.3 ± 1.6 kpc and 586 ± 7 km s-…
Evidence of a past disc-disc encounter: HV and DO Tau
Clarke, Cathie J.; Booth, Richard A.; Winter, Andrew J.
Theory and observations suggest that star formation occurs hierarchically due to the fragmentation of giant molecular clouds. In this case we would expect substructure and enhanced stellar multiplicity in the primordial cluster. This substructure is expected to decay quickly in most environments, however historic stellar encounters might leave imp…
Revisiting the exomoon candidate signal around Kepler-1625 b
Heller, René; Hippke, Michael; Gizon, Laurent +1 more
Context. Transit photometry of the Jupiter-sized exoplanet candidate Kepler-1625 b has recently been interpreted as showing hints of a moon. This exomoon, the first of its kind, would be as large as Neptune and unlike any moon we know from the solar system.
Aims: We aim to clarify whether the exomoon-like signal is indeed caused by a large ob…
Cosmological parameter forecasts for H I intensity mapping experiments using the angular power spectrum
Dickinson, C.; Remazeilles, M.; Olivari, L. C. +4 more
H I intensity mapping is a new observational technique to survey the large-scale structure of matter using the 21 cm emission line of atomic hydrogen (H I). In this work, we simulate BINGO (BAO from Integrated Neutral Gas Observations) and SKA (Square Kilometre Array) phase-1 dish array operating in autocorrelation mode. For the optimal case of BI…