Search Publications
A Census of the 32 Ori Association with Gaia
Luhman, K. L.
I have used high-precision photometry and astrometry from the third data release of Gaia (DR3) to identify candidate members of the 32 Ori association. Spectral types and radial velocities have been measured for subsets of the candidates using new and archival spectra. For the candidates that have radial velocity measurements, I have used UVW velo…
Imaging Polarization of the Blue-excess Hot Dust-obscured Galaxy WISE J011601.41-050504.0
Stern, D.; Bauer, F. E.; Díaz-Santos, T. +8 more
We report on VLT/FORS2 imaging polarimetry observations in the R Special band of WISE J011601.41-050504.0 (W0116-0505), a heavily obscured hyperluminous quasar at z = 3.173 classified as a Hot Dust-obscured Galaxy (Hot DOG) based on its mid-IR colors. Recently, Assef et al. identified W0116-0505 as having excess rest-frame optical/UV em…
No correlation of the Lyman continuum escape fraction with spectral hardness
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +25 more
The properties that govern the production and escape of hydrogen-ionizing photons (Lyman continuum, LyC; with energies > 13.6 eV) in star-forming galaxies are still poorly understood, but they are key to identifying and characterizing the sources that reionized the Universe. Here we empirically explore the relation between the hardness of ioniz…
Local Spiral Structure Traced by Red Clump Stars
Xu, Ye; Hou, Ligang; Liu, Dejian +5 more
Using the cross-matched data of Gaia EDR3 and the Two Micron All Sky Survey Point Source Catalog, a sample of RC stars with parallax accuracies better than 20% is identified and used to reveal the nearby spiral pattern traced by old stars. As shown in the overdensity distribution of RC stars, there is an arc-like feature extending from l ~ 90° to …
Heliospheric Compression Due to Recent Nearby Supernova Explosions
Fields, Brian D.; Miller, Jesse A.
The widespread detection of 60Fe in geological and lunar archives provides compelling evidence for recent nearby supernova explosions within ~100 pc at 3 and 7 Myr ago. The blasts from these explosions had a profound effect on the heliosphere. We perform new calculations to study the compression of the heliosphere due to a supernova bla…
A Multiwavelength Study of ELAN Environments (AMUSE2). Mass Budget, Satellites Spin Alignment, and Gas Infall in a Massive z 3 Quasar Host Halo
Hennawi, Joseph F.; Prochaska, J. Xavier; Lusso, Elisabeta +14 more
The systematic targeting of extended Lyα emission around high-redshift quasars resulted in the discovery of rare and bright Enormous Lyα Nebulae (ELANe) associated with multiple active galactic nuclei (AGNs). We initiate here "a multiwavelength study of ELAN environments" (AMUSE2) focusing on the ELAN around the z ~ 3 quasar SDSS J1040+…
Filling the gap between synchronized and non-synchronized sdBs in short-period sdBV+dM binaries with TESS: TIC 137608661, a new system with a well-defined rotational splitting
Németh, Péter; Silvotti, Roberto; Telting, John H. +5 more
TIC 137608661/TYC 4544-2658-1/FBS 0938+788 is a new sdBV+dM reflection-effect binary discovered by the TESS space mission with an orbital period of 7.21 h. In addition to the orbital frequency and its harmonics, the Fourier transform of TIC 137608661 shows many g-mode pulsation frequencies from the subdwarf B (sdB) star. The amplitude spectrum is …
Inspection of 19 globular cluster candidates in the Galactic bulge with the VVV survey
Minniti, D.; Ripepi, V.; Fernández-Trincado, J. G. +4 more
Context. The census of the globular clusters (GCs) in the Milky Way is still a work in progress. The advent of new deep surveys has made it possible to discover many new star clusters both in the Galactic disk and bulge, but many of these new candidates have not yet been studied in detail, leaving a veil on their true physical nature.
Aims: W…
The nova KT Eri Is a recurrent nova with a recurrence time-scale of 40-50 yr
Walter, Frederick M.; Schaefer, Bradley E.; Hounsell, Rebekah +1 more
KT Eridani was a very fast nova in 2009 peaking at V = 5.42 mag. We marshal large data sets of photometry to finally work out the nature of KT Eri. From the TESS light curve, as confirmed with our radial velocity curve, we find an orbital period of 2.61595 d. With our 272 spectral energy distributions from simultaneous BVRIJHK measures, the compan…
A Comparative Analysis of Machine-learning Models for Solar Flare Forecasting: Identifying High-performing Active Region Flare Indicators
Brandenburg, Axel; Nandy, Dibyendu; Srivastava, Nandita +9 more
Solar flares create adverse space weather impacting space- and Earth-based technologies. However, the difficulty of forecasting flares, and by extension severe space weather, is accentuated by the lack of any unique flare trigger or a single physical pathway. Studies indicate that multiple physical properties contribute to active region flare pote…