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The challenge of measuring the phase function of debris discs. Application to HR 4796 A
Bayo, A.; Henning, Th.; Milli, J. +2 more
Context. Debris discs are valuable systems to study dust properties. Because they are optically thin at all wavelengths, we have direct access to the absorption and scattering properties of the dust grains. One very promising technique to study them is to measure their phase function, that is, the scattering efficiency as a function of the scatter…
Estimating the Ultraviolet Emission of M Dwarfs with Exoplanets from Ca II and Hα
Loyd, R. O. Parke; Peacock, Sarah; Redfield, Seth +29 more
M dwarf stars are excellent candidates around which to search for exoplanets, including temperate, Earth-sized planets. To evaluate the photochemistry of the planetary atmosphere, it is essential to characterize the UV spectral energy distribution of the planet's host star. This wavelength regime is important because molecules in the planetary atm…
Gaia's detectability of black hole-main sequence star binaries formed in open clusters
Fujii, Michiko S.; Kumamoto, Jun; Shikauchi, Minori +1 more
Black hole-main sequence star (BH-MS) binaries are one of the targets of future data releases of the astrometric satellite Gaia. They are supposed to be formed in two main sites: a galactic field and star clusters. However, previous work has never predicted the number of BH-MS binaries originating in the latter sites. In this paper we estimate the…
Using radio triangulation to understand the origin of two subsequent type II radio bursts
Jebaraj, I. C.; Magdalenić, J.; Kilpua, E. K. J. +7 more
Context. Eruptive events such as coronal mass ejections (CMEs) and flares accelerate particles and generate shock waves which can arrive at Earth and can disturb the magnetosphere. Understanding the association between CMEs and CME-driven shocks is therefore highly important for space weather studies.
Aims: We present a study of the CME/flare…
Solar Irradiance Variability: Modeling the Measurements
Kopp, G.; Lean, J. L.; Marchenko, S. V. +3 more
New models of the Sun's irradiance variability are developed from 15 years of direct observations made by the Solar Radiation and Climate Experiment (SORCE) spacecraft from 2003 to 2017 (inclusive). Multiple linear regression parameterizes the observations in terms of facular brightening and sunspot darkening, which are the primary sources of sola…
The Kinematics of Massive Quiescent Galaxies at 1.4 < z < 2.1: Dark Matter Fractions, IMF Variation, and the Relation to Local Early-type Galaxies
Bender, Ralf; Mendel, J. Trevor; Nelson, Erica J. +10 more
We study the dynamical properties of massive quiescent galaxies at 1.4 < z < 2.1 using deep Hubble Space Telescope WFC3/F160W imaging and a combination of literature stellar velocity dispersion measurements and new near-infrared spectra obtained using the K-band Multi Object Spectrograph (KMOS) on the ESO Very Large Telescope. We use these d…
A Gaia Survey for Young Stars Associated with the Lupus Clouds
Luhman, K. L.
I have used high-precision photometry and astrometry from the second data release of the Gaia mission to perform a survey for young stars associated with the Lupus clouds, which have distances of ∼160 pc and reside within the Scorpius-Centaurus (Sco-Cen) OB association. The Gaia data have made it possible to distinguish Lupus members from most of …
Implications of dark matter cascade decay from DAMPE, HESS, Fermi-LAT, and AMS02 data
Gao, Yu; Ma, Yin-Zhe
Recent high-energy cosmic e± measurement from the DArk Matter Particle Explorer (DAMPE) satellite confirms the deviation of total cosmic ray electron spectrum above 700-900 GeV from a simple power law. In this paper, we demonstrate that the cascade decay of dark matter (DM) can account for DAMPE's TeV e+e- spectrum…
A panchromatic spatially resolved analysis of nearby galaxies - I. Sub-kpc-scale main sequence in grand-design spirals
Popesso, P.; Rodighiero, G.; Bianchi, S. +9 more
We analyse the spatially resolved relation between stellar mass (M⋆) and star formation rate (SFR) in disc galaxies (i.e. the main sequence, MS). The studied sample includes eight nearby face-on grand-design spirals, e.g. the descendant of high-redshift, rotationally supported star-forming galaxies. We exploit photometric information ov…
Properties of carbon stars in the solar neighbourhood based on Gaia DR2 astrometry
de Laverny, P.; Kordopatis, G.; Abia, C. +2 more
Context. Stars evolving along the asymptotic giant branch (AGB) can become carbon rich in the final part of their evolution. The detailed description of their spectra has led to the definition of several spectral types: N, SC, J, and R. To date, differences among them have been partially established only on the basis of their chemical properties. …