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X-ray Brightening and UV Fading of Tidal Disruption Event ASASSN-15oi
S. Gezari, S. B. Cenko, I. Arcavi
We present late-time observations by Swift and XMM-Newton of the tidal disruption event (TDE) ASASSN-15oi that reveal that the source brightened in the X-rays by a factor of $\sim1…
Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star
Iair Arcavi, D. Andrew Howell, Daniel Kasen +50
Every supernova hitherto observed has been considered to be the terminal explosion of a star. Moreover, all supernovae with absorption lines in their spectra show those lines decre…
The Rapid Reddening and Featureless Optical Spectra of the optical counterpart of GW170817, AT 2017gfo, During the First Four Days
Curtis McCully, Daichi Hiramatsu, D. Andrew Howell +17
We present the spectroscopic evolution of AT 2017gfo, the optical counterpart of the first binary neutron star (BNS) merger detected by LIGO and Virgo, GW170817. While models have…
Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
Iair Arcavi, Griffin Hosseinzadeh, D. Andrew Howell +8
The merger of two neutron stars has been predicted to produce an optical-infrared transient (lasting a few days) known as a 'kilonova', powered by the radioactive decay of neutron-…
Optical Follow-up of Gravitational-wave Events with Las Cumbres Observatory
Iair Arcavi, Curtis McCully, Griffin Hosseinzadeh +11
We present an implementation of the Gehrels et al. (2016) galaxy-targeted strategy for gravitational-wave (GW) follow-up using the Las Cumbres Observatory global network of telesco…
Nebular-Phase Spectra of Nearby Type Ia Supernovae
Melissa L. Graham, Sahana Kumar, Griffin Hosseinzadeh +8
We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at days after peak brightness using the Gemini South and Keck telescopes. All of the SNe Ia in our…