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The puzzling properties of the magnetic O star Tr16-22
Yael Naze, Rodolfo Barba, Stefano Bagnulo +4
(abridged version) Context : The detection of bright, hard, and variable X-ray emission in Tr16-22 prompted spectropolarimetric observations of this star, which in turn led to the…
SPIRITS 15c and SPIRITS 14buu: Two Obscured Supernovae in the Nearby Star-Forming Galaxy IC 2163
Jacob E. Jencson, Mansi M. Kasliwal, Joel Johansson +22
SPIRITS---SPitzer InfraRed Intensive Transients Survey---is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer/IRAC. We present the discovery…
Rising from the Ashes: Mid-Infrared Re-Brightening of the Impostor SN 2010da in NGC 300
Ryan M. Lau, Mansi M. Kasliwal, Howard E. Bond +16
We present multi-epoch mid-infrared (IR) photometry and the optical discovery observations of the "impostor" supernova (SN) 2010da in NGC 300 using new and archival Spitzer Space T…
Spectral classification and properties of the O Vz stars in the Galactic O-Star Spectroscopic Survey (GOSSS)
Julia I. Arias, Nolan R. Walborn, Sergio Simon-Diaz +11
On the basis of the Galactic O-Star Spectroscopic Survey (GOSSS), a detailed systematic investigation of the O Vz stars is presented. The currently used spectral classification cri…
First Results from the La Silla-QUEST Supernova Survey and the Carnegie Supernova Project
E. S. Walker, C. Baltay, A. Campillay +20
The LaSilla/QUEST Variability Survey (LSQ) and the Carnegie Supernova Project (CSP II) are collaborating to discover and obtain photometric light curves for a large sample of low r…
New Luminous ON Spectra from the Galactic O-Star Spectroscopic Survey
Nolan R. Walborn, Nidia I. Morrell, Rodolfo H. Barba +1
Two new ON supergiant spectra (bringing the total known to seven) and one new ONn giant (total of this class now eight) are presented; they have been discovered by the Galactic O-S…
Supernova 2010ev: A reddened high velocity gradient type Ia supernova
Claudia P. Gutiérrez, Santiago González-Gaitán, Gastón Folatelli +10
Aims. We present and study the spectroscopic and photometric evolution of the type Ia supernova (SN Ia) 2010ev. Methods. We obtain and analyze multi-band optical light curves and o…