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Nebular Spectroscopy of Kepler's Brightest Supernova
G. Dimitriadis, C. Rojas-Bravo, C. D. Kilpatrick +9
We present late-time (240-260 days after peak brightness) optical photometry and nebular (+236 and +264 days) spectroscopy of SN 2018oh, the brightest Type Ia supernova (SN I…
Target of Opportunity Observations of Gravitational Wave Events with LSST
R. Margutti, P. Cowperthwaite, Z. Doctor +79
The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough req…
Detection of Circumstellar Helium in Type Iax Progenitor Systems
Wynn Jacobson-Galan, Ryan Foley, Josiah Schwab +6
We present direct spectroscopic modeling of 44 Type Iax supernovae (SNe Iax) using spectral synthesis code SYNAPPS. We confirm detections of helium emission in the early-time spect…
K2 Observations of SN 2018oh Reveal a Two-Component Rising Light Curve for a Type Ia Supernova
G. Dimitriadis, R. J. Foley, A. Rest +145
We present an exquisite, 30-min cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explo…
Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the 2 Observations
W. Li, X. Wang, J. Vinkó +160
Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically-confirmed type Ia supernova (SN Ia) observed in the field. The data revealed an excess emission…
The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope
D. O. Jones, D. M. Scolnic, R. J. Foley +27
Measurements of the dark energy equation-of-state parameter, , have been limited by uncertainty in the selection effects and photometric calibration of Type Ia supernova…