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Proposal Identification No.: P2863 Date Received: 2013­Sep­03 15:58:54
Technical Page
This proposal has not been submitted before.
Proposal Type: Regular
General Category: Pulsars
Observation Category: Galactic
Total Time Requested: 12 Hours
Minimum Useful Time: 3 hours
Proposal Title: Timing J1913+1102: A compact, possibly asymmetric double neutron star sys­
tem
ABSTRACT:
J1913+1102, a 27.3­ms pulsar, was discovered by the PALFA Survey in 2012. Follow­up timing observations have
determined this pulsar is in a 4.95­hour binary system with another neutron star. Our preliminary determination of
the rate of advance of periastron enables a measurement of the total mass of the system of M tot # 2.87M# ,
assuming General Relativity. The system's low orbital eccentricity, e = 0.0895, suggests the pulsar's companion
formed in an electron capture supernova, and is thus relatively light compared to J1913+1102. Alternative theories
of gravity predict that such a large mass asymmetry would give rise to dipolar gravitational waves. In this proposal
we request 24 hours divided into 4 epochs, each covering a complete orbit of J1913+1102. These observations are
the first steps towards determining the masses of the two neutron stars and ultimately testing General Relativity.
Name Institution E­mail Phone Student
Patrick Lazarus Max­Planck­
Institute for Radio
Astronomy
plazarus@mpifr­bonn.mpg.de +49 228 525
181
G
Remote Observing Request
Observer will travel to AO
X Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
L­wide
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1150 ­ 1730
This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST.
This proposal requires coordination with Punta Salinas radar within the band 1222­1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
2