ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Omar G. Benvenuto (U. La Plata)
Title: The evolution of low mass, close binary systems leading to the formation of "black widow" systems
Date (JST): Tue, Feb 26, 2013, 12:00 - 13:00
Place: Seminar Room C
Related File: 897.pdf
Abstract: The existence of millisecond pulsars with planet-mass companions in close orbits is challenging from the stellar evolution point of view. We calculate in detail the evolution of binary systems self-consistently, including mass transfer, evaporation, and irradiation of the donor by X-ray feedback, demonstrating the existence of a new evolutionary path leading to short periods and compact donors as required by the observations of PSR J1719-1438 and PSR J1311 3430. In particular, the companion to PSR J1311-3430 has a very low surface hydrogen content (if any). We show that this is natural consequence of standard binary evolution for a very restricted range of initial periods and a given donor mass. It is also important to remark that the evolution of these system leads to a high-mass pulsars, as it seems to be demanded by observations.