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Pre-discovery Activity of New Interstellar Comet 2I/Borisov Beyond 5 AU
Quanzhi Ye, Michael S. P. Kelley, Bryce T. Bolin +15
Comet 2I/Borisov, the first unambiguous interstellar comet ever found, was discovered in August 2019 at au from the Sun on its inbound leg. No pre-discovery detection beyon…
Flat Field Forensics
Timothee Greffe, Roger Smith
We present two subtle charge transport problems revealed by the statistics of flat fields. Mark Downing has presented photon transfer curves showing variance dips of order 25% at s…
Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results
Kishalay De, Matthew J. Hankins, Mansi M. Kasliwal +24
(Abridged) Palomar Gattini-IR is a new wide-field, near-infrared robotic time domain survey operating at Palomar Observatory. Using a 30 cm telescope mounted with a H2RG detector,…
Characterization of the Nucleus, Morphology and Activity of Interstellar Comet 2I/Borisov by Optical and Near-Infrared GROWTH, Apache Point, IRTF, ZTF and Keck Observations
Bryce T. Bolin, Carey M. Lisse, Mansi M. Kasliwal +52
We present visible and near-infrared photometric and spectroscopic observations of interstellar object 2I/Borisov taken from 2019 September 10 to 2019 November 29 using the GROWTH,…
General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
Kevin B. Burdge, Michael W. Coughlin, Jim Fuller +23
General relativity predicts that short orbital period binaries emit significant gravitational radiation, and the upcoming Laser Interferometer Space Antenna (LISA) is expected to d…
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…