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Planets in the Galactic Bulge: Results from the SWEEPS Project
Kailash C. Sahu, Stefano Casertano, Jeff Valenti +13
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massiv…
Long GRBs from binary stars: runaway, Wolf-Rayet progenitors
M. Cantiello, S. -C. Yoon, N. Langer +1
The collapsar model for long gamma-ray bursts requires a rapidly rotating Wolf-Rayet star as progenitor. We test the idea of producing rapidly rotating Wolf-Rayet stars in massive…
Is the Bardeen-Petterson effect responsible for the warping and precession in NGC 4258?
Anderson Caproni, Zulema Abraham, Mario Livio +1
Strong evidence for the presence of a warped Keplerian accretion disc in NGC4258 (M 106) has been inferred from the kinematics of water masers detected at sub-parsec scales. Assumi…
Binary star progenitors of long gamma-ray bursts
M. Cantiello, S. -C. Yoon, N. Langer +1
We present a binary channel for the progenitors of long gamma-ray bursts. We test the idea of producing rapidly rotating Wolf-Rayet stars in massive close binaries through mass acc…
Accretion disc viscosity: how big is alpha?
A. R. King, J. E. Pringle, M. Livio
We consider observational and theoretical estimates of the accretion disc viscosity parameter . We find that in thin, fully-ionized discs, the best observational evidence sugges…
HST and VLT observations of the Symbiotic Star Hen 2-147
M. Santander-Garcia, R. L. M. Corradi, P. A. Whitelock +5
We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the Period-Luminosity…