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To Grow Old and Peculiar: A Survey of Anomalous Variable Stars in M80 and Age Determination using K2 and Gaia
László Molnár, Emese Plachy, Attila Bódi +11
The globular cluster Messier 80 was monitored by the Kepler space telescope for 80 days during the K2 mission. Continuous, high-precision photometry of such an old, compact cluster…
Citizen ASAS-SN: Citizen Science with The All-Sky Automated Survey for SuperNovae (ASAS-SN)
C. T. Christy, T. Jayasinghe, K. Z. Stanek +6
We present "Citizen ASAS-SN", a citizen science project hosted on the Zooniverse platform which utilizes data from the All-Sky Automated Survey for SuperNovae (ASAS-SN). Volunteers…
Classical Novae Masquerading as Dwarf Novae? Outburst Properties of Cataclysmic Variables with ASAS-SN
Adam Kawash, Laura Chomiuk, Jay Strader +12
The unprecedented sky coverage and observing cadence of the All-Sky Automated Survey for SuperNovae (ASAS-SN) has resulted in the discovery and continued monitoring of a large samp…
The ASAS-SN Catalog of Variable Stars IX: The Spectroscopic Properties of Galactic Variable Stars
T. Jayasinghe, C. S. Kochanek, K. Z. Stanek +11
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline ( yrs) band light curves for sources brighter than V mag across the whole sky.…
The ASAS-SN Catalog of Variable Stars V: Variables in the Southern Hemisphere
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +13
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline ( yrs) light curves for sources brighter than V mag across the whole sky. As part…
First Resolution of Microlensed Images
Subo Dong, A. Mérand, F. Delplancke-Ströbele +12
We employ VLTI GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation θ_{-,+}=3.78 +/- 0.05 mas, an…
The ASAS-SN Catalog of Variable Stars II: Uniform Classification of 412,000 Known Variables
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +12
The variable stars in the VSX catalog are derived from a multitude of inhomogeneous data sources and classification tools. This inhomogeneity complicates our understanding of varia…
ASAS-SN Identification of a Detached Eclipsing Binary System with a Year Period
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +6
We report the identification of a new, long period detached eclipsing binary by the All-Sky Automated Survey for Supernovae (ASAS-SN). Combining V-band photometry from ASAS-SN, ASA…
ASASSN-18di: discovery of a flare on a mid-M dwarf
Romy Rodríguez, Sarah J. Schmidt, Tharindu Jayasinghe +9
We report and characterize a white-light superflare on a previously undiscovered M dwarf detected by the ASAS-SN survey. Employing various color-magnitude and color-spectral type r…
OGLE-LMC-ECL-09937: The Most Massive Algol-Type Binary System With A Mass Measurement Accurate to 2%
D. M. Skowron, M. Kourniotis, J. L. Prieto +3
This paper presents a detailed analysis of the light and radial velocity curves of the semi-detached eclipsing binary system OGLE-LMC-ECL-09937. The system is composed of a hot, ma…
The 2014-2017 outburst of the young star ASASSN-13db: A time-resolved picture of a very low-mass star between EXors and FUors
A. Sicilia-Aguilar, A. Oprandi, D. Froebrich +13
ASASSN-13db is a M5-type star with a protoplanetary disk, the lowest mass star known to experience accretion outbursts. Since its discovery in 2013, it has experienced two outburst…
The Luminous Blue Variable RMC127 as seen with ALMA and ATCA
C. Agliozzo, C. Trigilio, G. Pignata +12
We present ALMA and ATCA observations of the luminous blue variable \rmc. The radio maps show for the first time the core of the nebula and evidence that the nebula is strongly asy…
A Detailed Observational Analysis of V1324 Sco, the Most Gamma-Ray Luminous Classical Nova to Date
Thomas Finzell, Laura Chomiuk, Brian D. Metzger +32
It has recently been discovered that some, if not all, classical novae emit GeV gamma rays during outburst, but the mechanisms involved in the production of the gamma rays are stil…
DM Ori: A Young Star Occulted by a Disturbance in its Protoplanetary Disk
Joseph E. Rodriguez, Keivan G. Stassun, Phillip Cargile +15
In some planet formation theories, protoplanets grow gravitationally within a young star's protoplanetary disk, a signature of which may be a localized disturbance in the disk's ra…
Massive stars exploding in a He-rich circumstellar medium - VII. The metamorphosis of ASASSN-15ed from a narrow line Type Ibn to a normal Type Ib Supernova
A. Pastorello, J. L. Prieto, N. Elias-Rosa +39
We present the results of the spectroscopic and photometric monitoring campaign of ASASSN-15ed. The transient was discovered quite young by the All Sky Automated Survey for SuperNo…
Massive stars exploding in a He-rich circumstellar medium. V. Observations of the slow-evolving SN Ibn OGLE-2012-SN-006
A. Pastorello, L. Wyrzykowski, S. Valenti +36
We present optical observations of the peculiar Type Ibn supernova (SN Ibn) OGLE-2012-SN-006, discovered and monitored by the OGLE-IV survey, and spectroscopically followed by PESS…
Dust to Dust: 3 years in the Evolution of the Unusual SN 2008S
D. M. Szczygiel, J. L. Prieto, C. S. Kochanek +5
We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope (LBT), near-IR data with the Hubble Space Telescope (HST), and mid-IR data with the…
The Photometric and Spectral Evolution of the 2008 Luminous Optical Transient in NGC 300
Roberta M. Humphreys, Howard E. Bond, Alceste Z. Bonanos +4
The 2008 optical transient in NGC 300 is one of a growing class of intermediate-luminosity transients that brighten several orders of magnitude from a previously optically obscured…
SN 2008jb: A "Lost" Core-Collapse Supernova in a Star-Forming Dwarf Galaxy at ~10 Mpc
Jose L. Prieto, J. C. Lee, A. J. Drake +9
We present the discovery and follow-up observations of SN 2008jb, a core-collapse supernova in the dwarf irregular galaxy ESO 302-14 at 9.6 Mpc. This transient was missed by galaxy…
An R- and I-Band Photometric Variability Survey of the Cygnus OB2 Association
Calen B Henderson, Kris Z Stanek, Ondrej Pejcha +1
We present a catalog of photometrically variable stars discovered within two 21'.3 X 21'.3 fields centered on the Cygnus OB2 association. There have hitherto been no deep optical v…