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The Physical Parameters of Four WC-type Wolf-Rayet Stars in the Large Magellanic Cloud: Evidence of Evolution
Erin Aadland, Philip Massey, D. John Hillier +1
We present a spectral analysis of four LMC WC-type Wolf-Rayet (WR) stars (BAT99-8, BAT99-9, BAT99-11, and BAT99-52) to shed light on two evolutionary questions surrounding massive…
The winking eye of a very massive star: WR 21a revealed as an eclipsing binary by TESS
Rodolfo H. Barbá, Roberto C. Gamen, Pablo Martín-Ravelo +2
WR~21a was known as a massive spectroscopic binary composed of an O2.5 If*/WN6ha primary and an O3 V((f*))z secondary. Although a minimum value, the mass estimated for the primary…
SN 2021csp -- the explosion of a stripped envelope star within a H and He-poor circumstellar medium
Morgan Fraser, Maximilian D. Stritzinger, Sean J. Brennan +48
We present observations of SN 2021csp, a unique supernova (SN) which displays evidence for interaction with H- and He- poor circumstellar material (CSM) at early times. Using high-…
A puzzle solved after two decades: SN 2002gh among the brightest of superluminous supernovae
Régis Cartier, Mario Hamuy, Carlos Contreras +9
We present optical photometry and spectroscopy of the superluminous SN 2002gh from maximum light to days, obtained as part of the Carnegie Type II Supernova (CATS) project.…
Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447
M. Berton, G. Peluso, P. Marziani +19
Narrow-line Seyfert 1 (NLS1) galaxies are a class of active galactic nuclei (AGN) that, in some cases, can harbor powerful relativistic jets. One of them, PKS 2004-447, shows gamma…
The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
Peredur M. Williams, Nidia I. Morrell, Konstantina Boutsia +1
Mid-infrared photometry of the Wolf-Rayet star HD 38030 in the Large Magellanic Cloud from the NEOWISE-R mission show it to have undergone a dust-formation episode in 2018 and the…
BAT99-9 -- a WC4 Wolf-Rayet star with nitrogen emission: Evidence for binary evolution?
D. John Hillier, Erin Aadland, Philip Massey +1
An analysis of the Large Magellanic Cloud (LMC) WC4 star BAT99-9 (HD 32125, FD 4, Brey 7, WS 3) shows that the star still contains photospheric nitrogen. Three N emission features…
SN 2013ai: a link between hydrogen-rich and hydrogen-poor core-collapse supernovae
S. Davis, P. J. Pessi, M. Fraser +33
We present a study of optical and near-infrared (NIR) spectra along with the light curves of SN 2013ai. These data range from discovery until 380 days after explosion. SN 2013ai is…