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Particle re-acceleration and Faraday-complex structures in the RXC J1314.4-2515 galaxy cluster
Dallacasa, D.; Vazza, F.; Botteon, A. +9 more
Radio relics are sites of electron (re)acceleration in merging galaxy clusters but the mechanism of acceleration and the topology of the magnetic field in and near relics are yet to be understood. We are carrying out an observational campaign on double relic galaxy clusters starting with RXC J1314.4-2515. With Jansky Very Large Array multiconfigur…
Infrared-excess white dwarfs in the Gaia 100 pc sample
Solano, E.; Rebassa-Mansergas, A.; Torres, S. +3 more
We analyse the 100 pc Gaia white dwarf volume-limited sample by means of VOSA (Virtual Observatory SED Analyser) with the aim of identifying candidates for displaying infrared excesses. Our search focuses on the study of the spectral energy distribution (SED) of 3733 white dwarfs with reliable infrared photometry and GBP - GRP
Plasmoid-mediated reconnection in solar UV bursts
Peter, H.; Chitta, L. P.; Young, P. R. +1 more
Context. Ultraviolet bursts are transients in the solar atmosphere with an increased impulsive emission in the extreme UV lasting for one to several tens of minutes. They often show spectral profiles indicative of a bi-directional outflow in response to magnetic reconnection.
Aims: To understand UV bursts, we study how motions of magnetic ele…
A New Class of Large-amplitude Radial-mode Hot Subdwarf Pulsators
Duev, Dmitry A.; Riddle, Reed; Szkody, Paula +22 more
Using high-cadence observations from the Zwicky Transient Facility at low Galactic latitudes, we have discovered a new class of pulsating, hot compact stars. We have found four candidates, exhibiting blue colors (g - r ≤ -0.1 mag), pulsation amplitudes of >5%, and pulsation periods of 200-475 s. Fourier transforms of the light curves show only …
X-shooter spectroscopy of young stars with disks. The TW Hydrae association as a probe of the final stages of disk accretion
Alcalá, J. M.; Randich, S.; Scholz, A. +9 more
Context. Measurements of the fraction of disk-bearing stars in clusters as a function of age indicate protoplanetary disk lifetimes ≲10 Myr. However, our knowledge of the time evolution of mass accretion in young stars over the disk lifespans is subject to many uncertainties, especially at the lowest stellar masses (M⋆).
Aims: We i…
MAVEN and MEX Multi-instrument Study of the Dayside of the Martian Induced Magnetospheric Structure Revealed by Pressure Analyses
André, N.; Fedorov, A.; Barabash, S. +9 more
A combination of statistical studies and 18 case studies have been used to investigate the structure of the induced Martian magnetosphere. The different plasma and magnetic pressure forces on the dayside of the induced magnetosphere of Mars have been studied using 3.5 years of Mars Atmosphere and Volatile Evolution (MAVEN) and Mars Express (MEX) o…
Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars
Kesseli, Aurora Y.; Muirhead, Philip S.; Cushing, Michael C. +9 more
M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller radii for a given effective temperature. We compile a sample of 88 stars that span spectral class…
Exploring the M-dwarf Luminosity-Temperature-Radius relationships using Gaia DR2
Naylor, Tim; Morrell, Sam
There is growing evidence that M-dwarf stars suffer radius inflation when compared to theoretical models, suggesting that models are missing some key physics required to completely describe stars at effective temperatures less than about 4000 K. The advent of Gaia DR2 distances finally makes available large data sets to determine the nature and ex…
J-PLUS: photometric calibration of large-area multi-filter surveys with stellar and white dwarf loci
Hernández-Monteagudo, C.; Carrasco, J. M.; Tremblay, P. -E. +24 more
Aims: We present the photometric calibration of the 12 optical passbands observed by the Javalambre Photometric Local Universe Survey (J-PLUS).
Methods: The proposed calibration method has four steps: (i) definition of a high-quality set of calibration stars using Gaia information and available 3D dust maps; (ii) anchoring of the J-PLUS …
Census of ρ Ophiuchi candidate members from Gaia Data Release 2
Mora, A.; Cánovas, H.; Bombrun, A. +6 more
Context. The Ophiuchus cloud complex is one of the best laboratories to study the earlier stages of the stellar and protoplanetary disc evolution. The wealth of accurate astrometric measurements contained in the Gaia Data Release 2 can be used to update the census of Ophiuchus member candidates.
Aims: We seek to find potential new members of …