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Proposal Identification No.:

P2991 Arecibo Observatory

Date Received: 2015-Mar-02 16:05:40 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 P2947. 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 16.25 0 0 16.25 1 hour less than 100 GB

PSR J2045+3633: A pulsar - massive WD system with an unusually eccentric

orbit
ABSTRACT: PSR J2045+3633 is a new 31.7 ms pulsar with a companion which is likely a massive WD and an orbital period of 32 days. Its expected timing precision with Arecibo is 0.3 us every 30 minutes, making it a likely NANOGrav target. The orbital eccentricity, 0.017, is the largest observed among these systems, and will eventually allow a very precise measurement of the rate of advance of periastron. This will, within a year, yield a very precise measurement of the total mass of the binary. In order to be able to determine the masses of the two individual components, we will need to measure some other post-Keplerian effect in the orbit. In this proposal, we request time for 12 observations in a single orbit (i.e., a timing campaign) to measure precisely the Shapiro delay. This will yield very precise masses for both components in the system almost irrespective of the orbital inclination of the system. Outreach Abstract: En este proyecto, trataremos de medir precisamente la masa de un pulsar (una estrella de neutrones) recientemente descubierta. Esto nos ensenara mas sobre la formacion de las estrellas de neutrones, y tal vez mas sobre las propiedades de la materia super densa, un problema importante en la fisica nuclear.

Name Paulo C Freire Marina Berezina

Institution Max Planck Institute for Radio Astronomy Max Planck Institute for Radio Astronomy

E-mail pfreire@mpifr-bonn.mpg.de mberezina@mpifr-bonn.mpg.de

Phone +49 228525496 +49 228525531

Student no G

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Additional Authors
Michael Kramer David Champion

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 20:00 ­ 21:15 ­ ­ ­

Days Needed at This Interval 13

Time Constraints (Must Be Justified in the Prop osal Text) On first day: observe with four frequencies (327 MHz, 430 MHz, L-band, S-band high). Determine best frequency for observing the pulsar. 12 observations to do orbital campaign - one every 3 days for the length of one orbit (32 days), for a total of 10 observations, plus two on days near superior conjunction, to maximize the probability of detecting the Shapiro delay.

Section I I I - Instruments Needed
430 G L-wide 327 S-high

Atmospheric Observation Instruments:

2


Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
295-359 422-442 1130-1730 3000-4000 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 J2045+3633

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