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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…
Sub-Chandrasekhar progenitors favoured for type Ia supernovae: Evidence from late-time spectroscopy
A. Flörs, J. Spyromilio, S. Taubenberger +6
A non-local-thermodynamic-equilibrium (NLTE) level population model of the first and second ionisation stages of iron, nickel and cobalt is used to fit a sample of XShooter optical…
Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
K. A. Bostroem, S. Valenti, D. J. Sand +44
We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual Type II supernova that exploded in NGC 1068 (D=10.1 Mpc). The light curve of SN 2018ivc d…
The polarized signal from broad emmission lines in AGN
P. Lira, R. W. Goosmann, M. Kishimoto +1
Using the STOKES Monte Carlo radiative transfer code we revisit the predictions of the spectropolarimetric signal from a disc-like Broad Emission Line Region (BLR) in Type I AGN du…
The Evolution of Luminous Red Nova AT 2017jfs in NGC 4470
A. Pastorello, T. -W. Chen, Y. -Z. Cai +43
We present the results of our photometric and spectroscopic follow-up of the intermediate-luminosity optical transient AT 2017jfs. At peak, the object reaches an absolute magnitude…
Follow-up of the Neutron Star Bearing Gravitational Wave Candidate Events S190425z and S190426c with MMT and SOAR
G. Hosseinzadeh, P. S. Cowperthwaite, S. Gomez +23
On 2019 April 25.346 and 26.640 UT the LIGO and Virgo gravitational wave (GW) observatories announced the detection of the first candidate events in Observing Run 3 that contain at…
The QUEST-La Silla AGN Variability Survey: selection of AGN candidates through optical variability
P. Sánchez-Sáez, P. Lira, R. Cartier +6
We used data from the QUEST-La Silla Active Galactic Nuclei (AGN) variability survey to construct light curves for 208,583 sources over deg, with a a limiting magnitu…
On the Ca-strong 1991bg-like type Ia supernova 2016hnk: evidence for a Chandrasekhar-mass explosion
Lluís Galbany, Chris Ashall, Peter Hoeflich +46
We present a comprehensive dataset of optical and near-infrared photometry and spectroscopy of type~Ia supernova (SN) 2016hnk, combined with integral field spectroscopy (IFS) of it…
Nebular H Limits for Fast Declining Type Ia Supernovae
D. J. Sand, R. C. Amaro, M. Moe +16
One clear observational prediction of the single degenerate progenitor scenario as the origin of type Ia supernovae (SNe) is the presence of relatively narrow (1000 km s$^…
Signatures of Circumstellar Interaction in the Type IIL Supernova ASASSN-15oz
K. Azalee Bostroem, Stefano Valenti, Assaf Horesh +27
Hydrogen-rich, core-collapse supernovae are typically divided into four classes: IIP, IIL, IIn, and IIb. In general, interaction with circumstellar material is only considered for…