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Panic at the ISCO: time-varying double-peaked broad lines from evolving accretion disks are common amongst optically variable AGN
Charlotte Ward, Suvi Gezari, Peter Nugent +12
About 3-10\% of Type I active galactic nuclei (AGN) have double-peaked broad Balmer lines in their optical spectra originating from the motion of gas in their accretion disk. Doubl…
A new class of pulsating hot subdwarfs
Thomas Kupfer, Evan B. Bauer, Kevin B. Burdge +22
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 ca…
The Outer Halo of the Milky Way as Probed by RR Lyr Variables from the Palomar Transient Facility
Judith Cohen, Branimir Sesar, Sophianna Bahnolzer +5
RR Lyr stars are ideal massless tracers that can be used to study the total mass and dark matter content of the outer halo of the Milky Way. This is because they are easy to find i…
Census of the Local Universe (CLU) Narrow-Band Survey I: Galaxy Catalogs from Preliminary Fields
David O. Cook, Mansi M. Kasliwal, Angela Van Sistine +13
We present the Census of the Local Universe (CLU) narrow-band survey to search for emission-line (\ha) galaxies. CLU-\ha~has imaged 3 of the sky (26,470~deg) with 4…
A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates
M. Charisi, I. Bartos, Z. Haiman +5
Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circu…
Searching for Be Stars in the Open Cluster NGC 663
P. C. Yu, C. C. Lin, W. P. Chen +6
We present Be star candidates in the open cluster NGC\,663, identified by H imaging photometry with the Palomar Transient Factory Survey, as a pilot program to investigate how t…