Search Publications
Completeness of the Gaia verse II: what are the odds that a star is missing from Gaia DR2?
Everall, Andrew; Boubert, Douglas
The second data release of the Gaia mission contained astrometry and photometry for an incredible 1692 919 135 sources, but how many sources did Gaiamiss and where do they lie on the sky? The answer to this question will be crucial for any astronomer attempting to map the Milky Way with Gaia DR2. We infer the completeness of Gaia DR2 by exploiting…
Radial Evolution of Coronal Mass Ejections Between MESSENGER, Venus Express, STEREO, and L1: Catalog and Analysis
Lugaz, N.; Winslow, R. M.; Salman, T. M.
Our knowledge of the properties of coronal mass ejections (CMEs) in the inner heliosphere is constrained by the relative lack of plasma observations between the Sun and 1 AU. In this work, we present a comprehensive catalog of 47 CMEs measured in situ measurements by two or more radially aligned spacecraft (MESSENGER, Venus Express, STEREO, Wind/A…
The Solar Orbiter Heliospheric Imager (SoloHI)
St. Cyr, O. C.; Plunkett, S. P.; Lamy, P. L. +45 more
Aims: We present the design and pre-launch performance of the Solar Orbiter Heliospheric Imager (SoloHI) which is an instrument prepared for inclusion in the ESA/NASA Solar Orbiter mission, currently scheduled for launch in 2020.
Methods: The goal of this paper is to provide details of the SoloHI instrument concept, design, and pre-fligh…
A stripped helium star in the potential black hole binary LB-1
Geier, S.; Heber, U.; Irrgang, A. +2 more
Context. The recently claimed discovery of a massive (MBH = 68-13+11 M⊙) black hole in the Galactic solar neighborhood has led to controversial discussions because it severely challenges our current view of stellar evolution.
Aims: A crucial aspect for the determination of the mass of the unseen bla…
Double White Dwarf Merger Products among High-mass White Dwarfs
Toonen, Silvia; Cheng, Sihao; Cummings, Jeffrey D. +1 more
Double white dwarf (double-WD) binaries may merge within a Hubble time and produce high-mass WDs. Compared to other high-mass WDs, the double-WD merger products have higher velocity dispersion because they are older. With the power of Gaia data, we show strong evidence for double-WD merger products among high-mass WDs by analyzing the transverse-v…
Velocity substructure from Gaia and direct searches for dark matter
Belokurov, Vasily; Evans, N. Wyn; Myeong, GyuChul +2 more
Data from the Gaia satellite show that the solar neighborhood of the Milky Way's stellar halo is imprinted with substructure from several accretion events. Evidence of these events is found in "the shards," stars clustering with high significance in both action space and metallicity. Stars in the shards share a common origin, likely as ancient sat…
EvryFlare. III. Temperature Evolution and Habitability Impacts of Dozens of Superflares Observed Simultaneously by Evryscope and TESS
Law, Nicholas M.; Corbett, Hank; Gonzalez, Ramses +8 more
Superflares may provide the dominant source of biologically relevant UV radiation to rocky habitable-zone M-dwarf planets (M-Earths), altering planetary atmospheres and conditions for surface life. The combined line and continuum flare emission has usually been approximated by a 9000 K blackbody. If superflares are hotter, then the UV emission may…
A Dynamical Survey of Stellar-mass Black Holes in 50 Milky Way Globular Clusters
Chatterjee, Sourav; Kremer, Kyle; Weatherford, Newlin C. +1 more
Recent numerical simulations of globular clusters (GCs) have shown that stellar-mass black holes (BHs) play a fundamental role in driving cluster evolution and shaping their present-day structure. Rapidly mass-segregating to the center of GCs, BHs act as a dynamical energy source via repeated superelastic scattering, delaying the onset of core col…
Hydrodynamic simulations unravel the progenitor-supernova-remnant connection in SN 1987A
Miceli, M.; Bocchino, F.; Orlando, S. +8 more
Context. Massive stars end their lives in catastrophic supernova (SN) explosions. Key information on the explosion processes and on the progenitor stars can be extracted from observations of supernova remnants (SNRs), which are the outcome of SNe. Deciphering these observations, however, is challenging because of the complex morphology of SNRs.
Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
Maurin, D.; Génolini, Y.; Derome, L. +2 more
Context. The Alpha Magnetic Spectrometer (AMS-02) measured several secondary-to-primary ratios enabling a detailed study of Galactic cosmic-ray transport.
Aims: We constrain previously derived benchmark scenarios (based on AMS-02 B/C data only) using other secondary-to-primary ratios to test the universality of transport and the presence of a…