Science Keywords: Select from 3 to 5 items.0Assigned ID: 888
----- Attempting Submission 1 (Fri Apr 10 21:54:10 GMT 2015) -----
HST Phase I Proposal 888 (form.apt) successfully submitted.
Receipt: # 888-1The only relevant Science Keyword for this proposal is "Neutron Satrs and Pulsars"0----- Attempting Submission 1 (Thu Jul 23 15:35:09 GMT 2015) -----Establishing the nature of the far-UV emission from the double pulsar.The unique double neutron star (NS) binary J0737-3039 contains two pulsars, the recycled millisecond pulsar A and the ordinary old pulsar B. Pulsar A is expected to dominate the optical to X-ray spectrum. X-ray observations, mainly sensitive to a hot (polar cap) emission component, do not constrain the whole NS surface temperature. In our previous HST observation we detected the far-UV (FUV) emission but only in one broad filter. However, from a single flux measurement one cannot infer the physical nature and origin of emission (thermal from the NS surface or nonthermal from the pulsar magnetosphere). The FUV emission is too faint to detect it with another filter, but deep optical observation will allow us to discriminate between the two possibilities. If thermal nature of the FUV emission is confirmed, it would establish the remarkably high NS surface temperature requiring revision of existing NS coooling models.We are using 4 STIS/CCD orbits to detect (or set an upper limit on) optical emission from the double-pulsar system. The STIS/CCD will be operated using CLEAR aperture to maximize the sensitivity. The science target (double pulsar J0737-3039) is 3.1 arcsec away from the reference star (GSC 2.3 identifier is S611010425; B=14 Jpg=13.88 N=13.47 Fpg=13.21) that will be used for acquisition but then will be occulted by the coronograph. We will use WEDGEA2.5 aperture. Observations are organized in four consecutive visits. At the beginning of each orbit the star will be re-acquired (i.e. unocculted STIS/CCD50 image is taken) and then it will be occulted by the coronograph for the rest of the orbit. In addition to its primary purpose, the acquisition image will be used in order to help to model the diffracted and scattered light. Acquisition images are 2-s long which allows to avoid saturation. The science exposures are divided into 3 CR-SPLIT subexposures (each 817 s long).
The first visit is restricted to two pre-determined roll angles ranges to avoid blocking the science target (J0737-3039) by the coronograph wedge and to avoid placing it within the diffraction spikes of the bright star S611010425. These restrictions have a margin of +15 degrees to accommodate for the incremental ORIENT increase in the subsequent visits each of which is required to have ORIENT increment of 3-5 degrees compared to the previous visit. All four visits will happen during consecutive four orbits.HOT STARS12falsefalsefalsefalse0.00.0SUPPORTEDSTARA4-A9 V-IVThe coordinates are based on the 2MASS position of the star and the UCAC4 proper motion of the star with the coordinates calculated for the year 2016 epoch.J2000STIS/CCDImagingYesNoWEDGEA1.0Timing link suitability includes constraints ([02 After 01 by 0.0 to 0.1 days] [03 After 01 by 0.0 to 0.1 days] [04 After 01 by 0.0 to 0.1 days])The scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14198
:visit-id "01"
:proposal-version -1
:trans-version "20150609"
:date "23-Jul-2015 11:28:06.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 55632
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14198
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14198
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 0
:internal-dur-at-end 360
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3245
:pcs-gap 0
)true10Timing link suitability includes constraints ([02 After 01 by 0.0 to 0.1 days])The scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14198
:visit-id "02"
:proposal-version -1
:trans-version "20150609"
:date "23-Jul-2015 11:28:07.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 55632
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14198
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14198
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 0
:internal-dur-at-end 360
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3245
:pcs-gap 0
)true10Timing link suitability includes constraints ([03 After 01 by 0.0 to 0.1 days])The scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14198
:visit-id "03"
:proposal-version -1
:trans-version "20150609"
:date "23-Jul-2015 11:28:07.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 55632
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14198
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14198
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 0
:internal-dur-at-end 360
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3245
:pcs-gap 0
)true10Timing link suitability includes constraints ([04 After 01 by 0.0 to 0.1 days])The scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14198
:visit-id "04"
:proposal-version -1
:trans-version "20150609"
:date "23-Jul-2015 11:28:08.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 55632
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14198
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14198
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 0
:internal-dur-at-end 360
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3245
:pcs-gap 0
)true10