Search Publications
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 …
The Star Formation History in the Solar Neighborhood as Told by Massive White Dwarfs
Isern, Jordi
White dwarfs (WDs) are the remnants of low- and intermediate-mass stars. Because of electron degeneracy, their evolution is just a simple gravothermal process of cooling. Recently, thanks to Gaia data, it has been possible to construct the luminosity function of massive (0.9≤slant M/{M}⊙ ≤slant 1.1) WDs in the solar neighborhood (d< …
Evolved massive stars at low-metallicity. I. A source catalog for the Small Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Jiang, Bi-Wei +9 more
We present a clean, magnitude-limited (IRAC1 or WISE1 ≤ 15.0 mag) multiwavelength source catalog for the Small Magellanic Cloud (SMC) with 45 466 targets in total, with the purpose of building an anchor for future studies, especially for the massive star populations at low-metallicity. The catalog contains data in 50 different bands including 21 o…
Distances to molecular clouds at high galactic latitudes based on Gaia DR2
Macquart, Jean-Pierre; Xu, Ye; Yan, Qing-Zeng +4 more
We report the distances of molecular clouds at high Galactic latitudes (|b| > 10°) derived from parallax and G-band extinction (AG) measurements in the second Gaia data release, Gaia DR2. Aided by Bayesian analyses, we determined distances by identifying the breakpoint in the extinction AG toward molecular clouds and using…
Probing fragmentation and velocity sub-structure in the massive NGC 6334 filament with ALMA
André, Ph.; Arzoumanian, D.; Shimajiri, Y. +3 more
Context. Herschel imaging surveys of galactic interstellar clouds support a paradigm for low-mass star formation in which dense molecular filaments play a crucial role. The detailed fragmentation properties of star-forming filaments remain poorly understood, however, and the validity of the filament paradigm in the intermediate- to high-mass regim…
The Fraction of Active Galactic Nuclei in the USS 1558-003 Protocluster at z = 2.53
Miller, Eric D.; Koyama, Yusei; Kodama, Tadayuki +8 more
The incidence of active galactic nuclei (AGNs) within the local environment is a potentially valuable probe of the mechanisms that trigger and provide fuel for accretion onto supermassive black holes. While the correlation between AGN fraction and environment has been well-studied in the local universe, AGN fractions have been measured for relativ…