Search Publications
On the Gaia DR2 distances for Galactic luminous blue variables
Drout, Maria R.; Smith, Nathan; Stassun, Keivan G. +3 more
We examine parallaxes and distances for Galactic luminous blue variables (LBVs) in the Gaia second data release (DR2). The sample includes 11 LBVs and 14 LBV candidates. For about half of the sample, DR2 distances are either similar to commonly adopted literature values, or the DR2 values have large uncertainties. For the rest, reliable DR2 distan…
Record-breaking Coronal Magnetic Field in Solar Active Region 12673
Fleishman, Gregory D.; Anfinogentov, Sergey A.; Stupishin, Alexey G. +1 more
The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ∼2000 G has ever been r…
Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey
Sanders, D. B.; Frayer, D. T.; Kim, D. -C. +23 more
We present IRAM-30 m Telescope 12CO and 13CO observations of a sample of 55 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe. This sample is a subset of the Great Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary multi-wavelength data to better understand their interstell…
SDSS-IV eBOSS Spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the Demographics of X-Ray- and Mid-infrared-selected Active Galactic Nuclei
Ananna, Tonima Tasnim; Salvato, Mara; Vivek, M. +5 more
We report the results of a Sloan Digital Sky Survey IV eBOSS program to target X-ray sources and mid-infrared-selected Wide-field Infrared Survey Explorer (WISE) active galactic nucleus (AGN) candidates in a 36.8 deg2 region of Stripe 82. About half this survey (15.6 deg2) covers the largest contiguous portion of the Stripe 8…
Revisiting the Long-period Transiting Planets from Kepler
Zhu, Wei; Wu, Yanqin; Herman, Miranda K.
Currently, we have only limited means to probe the presence of planets at large orbital separations. Foreman-Mackey et al. searched for long-period transiting planets in the Kepler light curves using an automated pipeline. Here, we apply their pipeline, with minor modifications, to a larger sample and use updated stellar parameters from Gaia DR2. …
Four stellar populations and extreme helium variation in the massive outer-halo globular cluster NGC 2419
Milone, A. P.; Cordoni, G.; Marino, A. F. +3 more
Recent work revealed that both the helium variation within globular clusters (GCs) and the relative numbers of first- and second-generation stars (1G, 2G) depend on the mass of the host cluster. Precise determination of the internal helium variations and of the fraction of 1G stars are crucial constraints to the formation scenarios of multiple pop…
Galactic tide and local stellar perturbations on the Oort cloud: creation of interstellar comets
Brown, A. G. A.; Torres, S.; Portegies Zwart, S. +1 more
Comets in the Oort cloud evolve under the influence of internal and external perturbations, such as giant planets, stellar passages, and the Galactic gravitational tidal field. We aim to study the dynamical evolution of the comets in the Oort cloud, accounting for the perturbation of the Galactic tidal field and passing stars. We base our study on…
OMEGA-OSIRIS mapping of emission-line galaxies in A901/2-V. The rich population of jellyfish galaxies in the multicluster system Abell 901/2
Chies-Santos, Ana L.; Aragón-Salamanca, A.; Bamford, Steven P. +3 more
We present the results of a systematic search and characterization of galaxies with morphological signatures of ram pressure stripping, known as jellyfish galaxies, in the multicluster system A901/2, at z ∼ 0.165, as part of the OMEGA survey. By visually inspecting Advanced Camera for Surveys/Hubble Space Telescope F606W images looking for morphol…
Investigating the diversity of Type Ia supernova spectra with the open-source relational data base KAEPORA
Foley, R. J.; Jones, D. O.; Siebert, M. R. +10 more
We present a public, open-source relational data base (we name KAEPORA) containing a sample of 4975 spectra of 777 Type Ia supernovae (SNe Ia). Since we draw from many sources, we significantly improve the spectra by inspecting these data for quality, removing galactic emission lines and cosmic rays, generating variance spectra, and correcting for…
The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood
Baranec, Christoph; Law, Nicholas M.; Riddle, Reed +8 more
Young stars in the solar neighborhood serve as nearby probes of stellar evolution and represent promising targets to directly image self-luminous giant planets. We have carried out an all-sky search for late-type (≈K7-M5) stars within 100 pc selected primarily on the basis of activity indicators from the Galaxy Evolution Explorer and ROSAT. Approx…