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ATLAS22kjn (AT 2022fpx): A Coronal Line Emitter with an Early Light Curve Bump and Mid-Infrared Dust Echo
Athena C. Engholm, Jason T. Hinkle, Benjamin J. Shappee +14
We present an analysis of ATLAS22kjn (AT 2022fpx), whose high-ionisation coronal lines (CLs) and pre-peak light curve bump provide distinctive opportunities to investigate the phys…
SN 2022erq: A Superluminous Thermonuclear Supernova with Escalating Preexplosion Mass Loss
Qian Zhai, Jujia Zhang, Xiaofeng Wang +51
We present a photometric and spectroscopic study of the superluminous Type Ia supernova SN 2022erq. Its early spectra, dominated by iron-group elements with weak intermediate-mass…
ASAS-SN Rates IV: Constraints on the Kilonova Rate
Dhvanil D. Desai, Benjamin J. Shappee, Christopher S. Kochanek +10
Kilonovae (KNe) are the electromagnetic signatures of neutron star mergers and are likely the dominant site of cosmic -process nucleosynthesis. However, their intrinsic rate rem…
Supernova Rates and Luminosity Functions from ASAS-SN III: Over a Decade of Type Ia SNe and Their Subtypes
Dhvanil D. Desai, Benjamin J. Shappee, Christopher S. Kochanek +11
We present volumetric rates and luminosity functions (LFs) of Type Ia supernovae (SNe Ia) from the All-Sky Automated Survey for Supernovae (ASAS-SN), covering the 11-year period fr…
CSS161010: a luminous, fast blue optical transient with broad blueshifted hydrogen lines
Claudia P. Gutiérrez, Seppo Mattila, Peter Lundqvist +38
We present ultraviolet, optical and near-infrared photometric and optical spectroscopic observations of the luminous, fast blue optical transient (LFBOT), CSS161010:045834-081803 (…
The Rise and Fall of ASASSN-18pg: Following a TDE from Early To Late Times
Thomas W. -S. Holoien, Katie Auchettl, Michael A. Tucker +29
We present nearly 500 days of observations of the tidal disruption event ASASSN-18pg, spanning from 54 days before peak light to 441 days after peak light. Our dataset includes X-r…
Luminous Type II supernovae for their low expansion velocities
Ó. Rodríguez, G. Pignata, J. P. Anderson +27
We present optical and near-IR data of three Type II supernovae (SNe II), SN 2008bm, SN 2009aj, and SN 2009au. These SNe display the following common characteristics: signs of earl…
SN 2016coi (ASASSN-16fp): an energetic H-stripped core-collapse supernova from a massive stellar progenitor with large mass loss
G. Terreran, R. Margutti, D. Bersier +25
We present comprehensive observations and analysis of the energetic H-stripped SN 2016coi (a.k.a. ASASSN-16fp), spanning the -ray through optical and radio wavelengths, acquired…
ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia
Ping Chen, Subo Dong, Boaz Katz +17
We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova ("SN Ia-pec") ASASSN-15pz. ASASSN-15pz is a spectroscopic "twin" of SN 2009dc, a so-calle…
ASASSN-18tb: A Most Unusual Type Ia Supernova Observed by TESS and SALT
P. J. Vallely, M. Fausnaugh, S. W. Jha +16
We present photometric and spectroscopic observations of the unusual Type Ia supernova ASASSN-18tb, including a series of SALT spectra obtained over the course of nearly six months…
Nebular Spectra of 111 Type Ia Supernovae Disfavor Single Degenerate Progenitors
M. A. Tucker, B. J. Shappee, P. J. Vallely +15
We place statistical constraints on Type Ia supernova (SN Ia) progenitors using 227 nebular phase spectra of 111 SNe Ia. We find no evidence of stripped companion emission in any o…
Strongly Bipolar Inner Ejecta of the Normal Type IIP Supernova ASASSN-16at
Subhash Bose, Subo Dong, N. Elias-Rosa +24
We report distinctly double-peakedH-alpha and H-beta emission lines in the late-time, nebular-phase spectra (>~200 d) of the otherwise normal at early phases (<~ 100 d) Type IIP su…
The Cow: discovery of a luminous, hot and rapidly evolving transient
S. J. Prentice, K. Maguire, S. J. Smartt +27
We present the ATLAS discovery and initial analysis of the first 18 days of the unusual transient event, ATLAS18qqn/AT2018cow. It is characterized by a high peak luminosity (…
ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
M. A. Tucker, B. J. Shappee, T. W. -S. Holoien +21
We present the discovery of ASASSN-18ey (MAXI J1820+070), a new black hole low-mass X-ray binary discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). A week after A…
PS18kh: A New Tidal Disruption Event with a Non-Axisymmetric Accretion Disk
T. W. -S. Holoien, M. E. Huber, B. J. Shappee +38
We present the discovery of PS18kh, a tidal disruption event (TDE) discovered at the center of SDSS J075654.53+341543.6 ( Mpc) by the Pan-STARRS Survey for Transients.…
ASASSN-15nx: A luminous Type II supernova with a "perfect" linear decline
Subhash Bose, Subo Dong, C. S. Kochanek +24
We report a luminous Type II supernova, ASASSN-15nx, with a peak luminosity of M_V=-20 mag, that is between typical core-collapse supernovae and super-luminous supernovae. The post…
The Rise and Peak of the Luminous Type IIn SN 2017hcc/ATLAS17lsn from ASAS-SN and Swift UVOT Data
J. L. Prieto, Ping Chen, Subo Dong +7
We present observations of the rise and peak of the Type IIn supernova SN 2017hcc/ATLAS17lsn obtained by the All-Sky Automated Survey for Supernovae (ASAS-SN) and Swift UVOT. The l…
Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
M. R. Drout, A. L. Piro, B. J. Shappee +41
On 2017 August 17, gravitational waves were detected from a binary neutron star merger, GW170817, along with a coincident short gamma-ray burst, GRB170817A. An optical transient so…
The Long Term Evolution of ASASSN-14li
J. S. Brown, T. W. -S Holoien, K. Auchettl +5
We present late-time optical spectroscopy taken with the Large Binocular Telescope's Multi-Object Double Spectrograph, late-time SWIFT UVOT and XRT observations, as well as improve…
Hello Darkness My Old Friend: The Fading of the Nearby TDE ASASSN-14ae
Jonathan S. Brown, Benjamin J. Shappee, T. W. -S Holoien +3
We present late-time optical spectroscopy taken with the Large Binocular Telescope's Multi-Object Double Spectrograph, an improved ASAS-SN pre-discovery non-detection, and late-tim…
ASASSN-15oi: A Rapidly Evolving, Luminous Tidal Disruption Event at 216 Mpc
T. W. -S. Holoien, C. S. Kochanek, J. L. Prieto +17
We present ground-based and Swift photometric and spectroscopic observations of the tidal disruption event (TDE) ASASSN-15oi, discovered at the center of 2MASX J20390918-3045201 ($…
Almost Gone: SN~2008S and NGC~300 2008OT-1 are Fainter than their Progenitors
S. M. Adams, C. S. Kochanek, J. L. Prieto +3
We present late-time Hubble and Spitzer Space Telescope imaging of SN 2008S and NGC 300 2008OT-1, the prototypes of a common class of stellar transients whose true nature is debate…
Six Months of Multi-Wavelength Follow-up of the Tidal Disruption Candidate ASASSN-14li and Implied TDE Rates from ASAS-SN
T. W. -S. Holoien, C. S. Kochanek, J. L. Prieto +21
We present ground-based and Swift photometric and spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at the center of PGC 043234 ($d\simeq9…
Optical observations of the luminous Type IIn Supernova 2010jl for over 900 days
J. E. Jencson, J. L. Prieto, C. S. Kochanek +3
The luminous Type IIn Supernova (SN) 2010jl shows strong evidence for the interaction of the SN ejecta with dense circumstellar material (CSM). We present observations of SN 2010jl…