Search Publications
Stellar activity analysis of Barnard's Star: very slow rotation and evidence for long-term activity cycle
Rebolo, R.; Amado, P. J.; Caballero, J. A. +58 more
The search for Earth-like planets around late-type stars using ultrastable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signals that can be misinterpreted as planetary signals. Among the nearby stars, we have selected Barnard's S…
Expected intermediate-mass black holes in the Virgo cluster - I. Early-type galaxies
Soria, Roberto; Graham, Alister W.
We expand upon the AMUSE-Virgo survey which imaged 100 early-type Virgo cluster galaxies with the Chandra X-ray Observatory, and we place an emphasis on potential intermediate-mass black holes (IMBHs). Virgo early-type galaxies with absolute magnitudes M_B≳ -20.5 mag have B-band luminosities that scale with the square of the stellar velocity dispe…
Simulating and interpreting deep observations in the Hubble Ultra Deep Field with the JWST/NIRSpec low-resolution `prism'
Charlot, Stéphane; Chevallard, Jacopo; Maseda, Michael V. +16 more
The James Webb Space Telescope (JWST) will enable the detection of optical emission lines in galaxies spanning a broad range of luminosities out to redshifts z ≳ 10. Measurements of key galaxy properties, such as star formation rate and metallicity, through these observations will provide unique insight into, e.g. the role of feedback from stars a…
The period-luminosity relation of red supergiants with Gaia DR2
Bedding, Timothy R.; Murphy, Simon J.; Dobie, Dougal +3 more
We revisit the K -band period-luminosity (P-L) relations of Galactic red supergiants using Gaia Data Release 2 parallaxes and up to 70 yr of photometry from AAVSO and ASAS campaigns. In addition, we examine 206 LMC red supergiants using 50 yr of photometric data from the digitized Harvard Astronomical Plate Collection. We identified periods by com…
Experimental phase function and degree of linear polarization of cometary dust analogues
Bertini, I.; Cremonese, G.; Lazzarin, M. +12 more
We present experimental phase function and degree of linear polarization curves for seven samples of cometary dust analogues namely: ground pieces of Allende, DaG521, FRO95002, and FRO99040 meteorites, Mg-rich olivine and pyroxene, and a sample of organic tholins. The experimental curves have been obtained at the IAA Cosmic Dust Laboratory at a wa…
Evidence for short ∼ 1 Myr lifetimes from the He II proximity zones of z ∼ 4 quasars
Hennawi, Joseph F.; Worseck, Gábor; Khrykin, Ilya S.
The duration of quasar accretion episodes is a key quantity for distinguishing between models for the formation and growth of supermassive black holes, the evolution of quasars, and their potential feedback effects on their host galaxies. However, this critical time-scale, often referred to as the quasar lifetime, is still uncertain by orders of m…
MOVES - II. Tuning in to the radio environment of HD189733b
Moutou, C.; Vidotto, A. A.; Bourrier, V. +7 more
We present stellar wind modelling of the hot Jupiter host HD189733, and predict radio emission from the stellar wind and the planet, the latter arising from the interaction of the stellar wind with the planetary magnetosphere. Our stellar wind models incorporate surface stellar magnetic field maps at the epochs 2013 June/July, 2014 September, and …
Triage of astrometric binaries - how to find triple systems and dormant black hole secondaries in the Gaia orbits
Mazeh, T.; Holl, B.; Faigler, S. +1 more
Preparing for the expected wealth of Gaia detections, we consider here a simple algorithm for classifying unresolved astrometric binaries with main-sequence (MS) primary into three classes: binaries with a probable MS secondary, with two possible values for the mass ratio; probable hierarchical triple MS systems with an astrometric secondary as a …
The mass-loss, expansion velocities, and dust production rates of carbon stars in the Magellanic Clouds
Goldman, Steven R.; Boyer, Martha L.; van Loon, Jacco Th +5 more
The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as a function of the stellar parameters by consistently following the growth for several dust species…
The impact of stellar feedback from velocity-dependent ionized gas maps - a MUSE view of Haro 11
Östlin, G.; Hayes, M.; Adamo, A. +6 more
We have used the capability of the Multi-Unit Spectroscopic Explorer (MUSE) instrument to explore the impact of stellar feedback at large scales in Haro 11, a galaxy under extreme starburst condition and one of the first galaxies where Lyman continuum (LyC) has been detected. Using H α, [O III] λ5007, and [O I] λ6300 emission lines from deep MUSE …