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Proposal Identification No.:

P2786 Arecibo Observatory

Date Received: 2012-Sep-04 17:30:22 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2012. This proposal has been submitted before. The previous proposal number is P2650. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: Regular Pulsars 12 12 51 1 hour 100-500 GB

Long Term Timing of PSR J0348+0432: A Unique and Powerful Gravitational

Laboratory
ABSTRACT: We propose to continue long-term timing of the relativistic binary pulsar system J0348+0432, in order to measure the decay of the orbital period from gravitational wave emission. The pulsar has an optical counterpart determined to be a 0.172 +/- 0.003 M white dwarf. The mass ratio is 11.85 +/- 0.11 which yields a pulsar mass of 2.04 +/- 0.03 M (all 1- ). The large difference in the compactness of these ob jects and the tight 2.46-hr orbit combine to make this system a strong emitter of dipolar gravitational waves, according to alternate theories of gravity. General Relativity predicts no such emission and hence this is a critical distinction to test. Arecibo and Green Bank Telescope timing of this system are already placing unique limits on these alternative theories, and with an additional year of timing, we should be able to improve our measurement of orbital decay to 10- . Outreach Abstract: A team of astronomers is proposing to continue their study of the pulsar J0348+0432. This pulsar orbits a second star, which is a white dwarf, in a very compact binary system-it only takes 2.4 hours for the stars to orbit each other! The pulsar is twice the mass of our Sun and the white dwarf is about 0.17 times the mass of our Sun. Astronomers are so interested in this pulsar system because it will allow them to test Einstein's theory of gravity and some alternative theories like no other system before. This is done by looking for a small change in the orbital period, caused by the emission of gravitational waves as the two stars orbit each other. Arecibo is the best telescope in the world for studying J0348+0432.

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Name Ryan S Lynch Paulo C Freire

Institution McGill University Max-Planck-Institut fur Radioastronomie Ё

E-mail rlynch@physics.mcgill.ca pfreire@mpifr-bonn.mpg.de

Phone (717) 823-1585 (+49) 228 525 496

Student no no

Additional Authors
John Antoniadis jantoniadis@mpifr-bonn.mpg.de (Graduate Student) Norbert Wex wex@mpifr-bonn.mpg.de Ingrid Stairs - stairs@astro.ubc.ca Scott Ransom - sransom@nrao.edu Victoria Kaspi vkaspi@physics.mcgill.ca Michael Kramer mkramer@mpifr-bonn.mpg.de Jason Hessels J.W.T.Hessels@uva.nl Duncan Lorimer Duncan.Lorimer@mail.wvu.edu Maura McLaughlin maura.mclaughlin@mail.wvu.edu Anne Archibald aarchiba@physics.mcgill.ca (Graduate Student) Aaron Berndsen berndsen@phas.ubc.ca Jason Boyles jboyles5@mix.wvu.edu Fernando Cardoso rcardoso@wisc.edu (Graduate Student) Vlad Kondratiev kondratiev@astron.nl Tim Pennucci ttp4tx@mail.astro.virginia.edu (Graduate Student) Mallory Roberts malloryr@gmail.com Kevin Stovall stovall.kevin@gmail.com (Graduate Student) Joeri van Leeuwen leeuwen@astron.nl

This work is part of a PhD thesis.

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin End IntervalInterval 02:40 04:45 2

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text)

Next Semester Time Request

Begin End IntervalInterval 02:40 04:45

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text)

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - 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 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

Section V - Observing List Target List
J0348+0432 03:48:43.64 04:32:11.45 02:51-04:46 Pulsar

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