Pulsars, transients and relativistic astrophysics

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Type Ibn Supernovae Show Photometric Homogeneity and Spectral Diversity at Maximum Light

The Astrophysical Journal American Astronomical Society 836:2 (2017) 158

Authors:

Griffin Hosseinzadeh, Iair Arcavi, Stefano Valenti, Curtis McCully, D Andrew Howell, Joel Johansson, Jesper Sollerman, Andrea Pastorello, Stefano Benetti, Yi Cao, S Bradley Cenko, Kelsey I Clubb, Alessandra Corsi, Gina Duggan, Nancy Elias-Rosa, Alexei V Filippenko, Ori D Fox, Christoffer Fremling, Assaf Horesh, Emir Karamehmetoglu, Mansi Kasliwal, GH Marion, Eran Ofek, David Sand, Francesco Taddia, WeiKang Zheng, Morgan Fraser, Avishay Gal-Yam, Cosimo Inserra, Russ Laher, Frank Masci, Umaa Rebbapragada, Stephen Smartt, Ken W Smith, Mark Sullivan, Jason Surace, Przemek Woźniak
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The Progenitor and Early Evolution of the Type IIb SN 2016gkg

The Astrophysical Journal Letters American Astronomical Society 836:1 (2017) l12

Authors:

L Tartaglia, M Fraser, DJ Sand, S Valenti, SJ Smartt, C McCully, JP Anderson, I Arcavi, N Elias-Rosa, L Galbany, A Gal-Yam, JB Haislip, G Hosseinzadeh, DA Howell, C Inserra, SW Jha, E Kankare, P Lundqvist, K Maguire, S Mattila, D Reichart, KW Smith, M Smith, M Stritzinger, M Sullivan, F Taddia, L Tomasella
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Early observations of the nearby type Ia supernova SN 2015F

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 464:4 (2017) stw2678

Authors:

R Cartier, M Sullivan, R Firth, G Pignata, P Mazzali, K Maguire, MJ Childress, I Arcavi, C Ashall, B Bassett, SM Crawford, C Frohmaier, L Galbany, A Gal-Yam, G Hosseinzadeh, DA Howell, C Inserra, J Johansson, EK Kasai, C McCully, S Prajs, S Prentice, S Schulze, SJ Smartt, KW Smith, M Smith, S Valenti, DR Young
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SETIBURST: A Robotic, Commensal, Realtime Multi-science Backend for the Arecibo Telescope

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 228:2 (2017) ARTN 21

Authors:

J Chennamangalam, D MacMahon, J Cobb, A Karastergiou, APV Siemion, K Rajwade, W Armour, V Gajjar, DR Lorimer, MA McLaughlin, D Werthimer, C Williams
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Rapid and Bright Stellar-mass Binary Black Hole Mergers in Active Galactic Nuclei

ASTROPHYSICAL JOURNAL American Astronomical Society 835:2 (2017) ARTN 165

Authors:

Imre Bartos, Bence Kocsis, Zoltan Haiman, Szabolcs Marka

Abstract:

© 2017. The American Astronomical Society. All rights reserved. The Laser Interferometer Gravitational-wave Observatory (LIGO) found direct evidence for double black hole binaries emitting gravitational waves. Galactic nuclei are expected to harbor the densest population of stellar-mass black holes. A significant fraction (∼30%) of these black holes can reside in binaries. We examine the fate of the black hole binaries in active galactic nuclei, which get trapped in the inner region of the accretion disk around the central supermassive black hole. We show that binary black holes can migrate into and then rapidly merge within the disk well within a Salpeter time. The binaries may also accrete a significant amount of gas from the disk, well above the Eddington rate. This could lead to detectable X-ray or gamma-ray emission, but would require hyper- Eddington accretion with a few percent radiative efficiency, comparable to thin disks. We discuss implications for gravitational-wave observations and black hole population studies. We estimate that Advanced LIGO may detect ∼20 such gas-induced binary mergers per year.
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