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Proposal Identification No.:

P2680 Arecibo Observatory

Date Received: 2015-Mar-02 12:25:16 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2015. This proposal has been submitted before. The previous proposal number is P2680. 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: ABSTRACT: Regular Pulsars 15 15 75 60 2 100-500 GB

Going over the edge - the precessing relativistic pulsar J1906+0746 (continued)

We propose to continue the long-term monthly timing campaign on PSR J1906+0746, the relativistic binary pulsar found in the PALFA survey data. The pulse profile of this young pulsar changes from month to month, pointing to dramatic geodetic precession. From the different cuts through the pulsar emission region, we have constructed rare beam maps of both magnetic poles. Our line of sight now even appears to be approaching the edge of the emission region, and the pulsar flux has decreased enormously. Only with Arecibo/PUPPI can this beam mapping be completed, before the pulsar disappears for the next century. Outreach Abstract: When you start a spinning top, it doesn' t only rotate - it also wobbles. In massive, compact stars, such wobbling can also be caused by the gravitational pull of another massive, nearby star. We have recently found with Arecibo a twin system, consisting of two very massive stars. One of these, a neutron star, shone brightly in radio. Recently however, its wobbling is causing most of the radio light to miss Earth. We want to measure the wobbling very accurately while we can, to weigh both stars in the twin system and determine what they are made of, and how they were formed.

Name Joeri Van Leeuwen Ingrid Stairs

Institution ASTRON UBC

E-mail leeuwen@astron.nl stairs@astro.ubc.ca

Phone +31 626 154 552

Student no no

This work is not part of a thesis. 1


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 .

Begin ­ End Interval­Interval 18:00 ­ 21:15 ­ ­ ­

Days Needed at This Interval 6

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

Next Semester Time Request

Begin ­ End Interval­Interval 18:00 ­ 21:15 ­ ­ ­

Days Needed at This Interval 6

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

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

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned

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
PSR J1906+0746 19:06:48.67 +07:46:28.6 17:58-20:15

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