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Дата изменения: Fri Sep 6 19:44:23 2013
Дата индексирования: Sat Mar 1 00:11:37 2014
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Proposal Identification No.:

P2650 Arecibo Observatory

Date Received: 2013-Sep-03 15:31:52 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2013. 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 Galactic 12 12 96 1.0 100-500 GB

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

Extreme Gravity
ABSTRACT: We propose to continue long-term timing of the relativistic binary pulsar system J0348+0432, with the goal of improving our precision measurement of the decay of the orbital period from gravitational wave emission. The pulsar has a white dwarf companion with mass Mc = 0.172 Msun, and the pulsar mass is Mp = 2.01 Msun. According to some theories of gravity, the large difference in the compactness of these ob jects and the tight 2.46-hr orbit should cause significant emission of dipolar gravitational waves. Our measurement of the orbital decay is, however, in good agreement with general relativity and has allowed us to rule out significant phase space for the scalar field coupling constants in Scalar-Tensor theories of gravity. Continued Arecibo pulsar timing will improve the precision of our orbital decay measurements. This will further tighten the constraints on alternative theories of gravity, and provide more precise mass estimates. Outreach Abstract: An international team of astronomers are proposing to use the Arecibo Observatory to study a binary pulsar named J0348+0432. A pulsar is the remains of a dead star (more massive than our Sun but not massive enough to become a black hole), and a binary system is one in which the pulsar orbits around another companion star. The companion to J0348+0432 is a white dwarf star. Astronomers have measured the mass of both ob jects and J0348+0432 is the most massive pulsar known. It is an extremely powerful tool for testing Einstein's theory of general relativity and for helping physicists to understand how matter behaves at extraordinary densities.

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Name Ryan S Lynch Paulo Freire

Institution McGill University Max Planck Institut fur Radioastronomie

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

Phone 717-823-1585 +49 228525496

Student no no

Additional Authors
J. Antoniadis (jantoniadis@mpifr-bonn.mpg.de) V. Kaspi (vkaspi@physics.mcgill.ca) V. Kondratiev (vlad.kondratiev@gmail.com) M. Kramer (mkramer@mpifr-bonn.mpg.de) D. Lorimer (Duncan.Lorimer@mail.wvu.edu) M. McLaughlin (maura.mclaughlin@mail.wvu.edu) S. Ransom (sransom@nrao.edu) I. Stairs (stairs@astro.ubc.ca) T. Tauris (tauris@astro.uni-bonn.de) J. van Leeuwen (leeuwen@astron.nl) N. Wex (wex@mpifr-bonn.mpg.de)

This work is not part of a 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 02:46 04:46

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text) Observations should be scheduled every 30 +/- 3 days.

Next Semester Time Request
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Begin End IntervalInterval 02:46 04:46

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text) Observations should be scheduled every 30 +/- 3 days.

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

Sp ecial Equipment or setup: PUPPI is primary. WAPPs are back-up.

Section IV - RFI Considerations Frequency Ranges Planned
1150 - 1730 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
Ob ject Type RA DEC Rise Set J0348+0432 Pulsar 03:48:43.6 04:32:11.5 02:51 04:46

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