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The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS)
Villanueva, Geronimo L.; Cochran, Anita L.; Bauer, James +14 more
Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile, as opposed to H2O, and one of the largest N2/CO ratios ever observed in a comet. Using observations obtained with the Spitzer Space Telescope, NASA’s Infrared Telescope Facility, the 3.5 m Astrophysical Research Consortium te…
Online Database of Class I Methanol Masers
Ladeyschikov, Dmitry A.; Sobolev, Andrey M.; Bayandina, Olga S.
In this paper, we present a database of class I methanol masers. The compiled information from the available literature provides an open and fast access to the data on class I methanol maser emission, including search, analysis, and visualization of the extensive maser data set. There is information on individual maser components detected with sin…
Gaia 19ajj: A Young Star Brightening Due to Enhanced Accretion and Reduced Extinction
Hillenbrand, Lynne A.; Reipurth, Bo; Isaacson, Howard +2 more
We report on the source Gaia 19ajj, identifying it as a young star associated with a little-studied star-forming region seen along a complex line of sight through the Gum Nebula. The optical lightcurve recently recorded by Gaia exhibits a slow and unsteady 5.5 mag rise over about 3 yr, while the mid-infrared lightcurve from NEOWISE over the same t…
The New EXor Outburst of ESO-Hα 99 Observed by Gaia ATLAS and TESS
Kochanek, C. S.; Tonry, John; Vallely, Patrick J. +11 more
We report photometry and spectroscopy of the outburst of the young stellar object ESO-Hα99. The outburst was first noticed in Gaia alert Gaia18dvc and later by the Asteroid Terrestrial-impact Last Alert System (ATLAS). We have established the outburst light curve with archival ATLAS orange filter photometry, Gaia data, new V-band photometry, and J…
Resolved Imaging of the AR Puppis Circumbinary Disk
Marshall, J. P.; Ertel, S.; Milli, J. +14 more
Circumbinary disks are common around post-asymptotic giant branch (post-AGB) stars with a stellar companion on orbital timescales of a few 100 to few 1000 days. The presence of a disk is usually inferred from the system’s spectral energy distribution and confirmed, for a sub-sample, by interferometric observations. We used the Spectro-Polarimetric…
A New Mass Determination of (349) Dembowska with Close Encounters
Fu, Yanning; Yuan, Ye; Li, Fan
(349) Dembowska is a big R-type main-belt asteroid. A new and more precise determination of its mass, M, is presented. The high precision is achieved, in particular, using our generally applied criterion of selecting model parameters. This criterion takes into account the sensitivity to M of the available observables, i.e., the position of another…