15676( 3) - 18-Mar-2019 19:36:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15676 Version: 3 Check-in Time: 18-Mar-2019 19:36:08 STScI Edit Number: 0 Title A new adventure of the musketeer PSR B1055-52 ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Bettina Posselt The Pennsylvania State University Y CoI: Dr. George G. Pavlov The Pennsylvania State University N CoI: Shi Dai CSIRO, Australia Telescope National N Facility CoI: Dr. Richard N. Manchester CSIRO, Australia Telescope National N Facility ------------------------------------------------------------------------------------ Abstract The nearby, middle-aged neutron star PSR B1055-52, one of the so-called Three Musketeers, has been observed once by XMM-Newton in 2000 resulting in a detailed phase-resolved spectral analysis. Chandra observations in 2012 show spectral changes and an apparent >30% flux decrease with respect to the 2000 XMM-Newton observation. These changes are too large to be due to cross-calibration problems. We propose new XMM-Newton observations to probe the apparent spectral changes. Using a better suited instrument mode than the 2000 observations, we will also be able to measure more accurately the magnetospheric spectral component and relate it to the radio and gamma-ray pulse profiles. Furthermore, we will search for phase-dependent absorption features in the new epoch data. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of the HST observation in this joint HST/XMM project is to obtain measurements of the pulsar flux in two NIR bands (F110W, F160W). The scheduling is independent from XMM-Newton scheduling. The pulsar is expected to be very faint, and it is close (4.8 arcsec separation) to a bright star. Therefore, we apply ORIENT constraints to avoid diffraction and bleeding spikes. We further employ the STEP-readout mode for a better dynamical exposure coverage that will help to minimize persistence (we cannot avoid peristence at various locations due to many bright objects in the field together with a faint target). We also use a small dither pattern (offsets according to WIDE-3POS-TARGs in Instrument Science Report WFC3 2016-14) aiming to sample the PSF as good as possible. While not the main goal, we will look for extended emission around the position of the pulsar. ------------------------------------------------------------------------------------ 15676( 3) - 18-Mar-2019 19:36:08 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PSRB1052-52 STAR, PULSAR RA=10H57M58.9650S +/- 0.2", J2000 V = 25.5 DEC=-52D26'56.26" +/- 0.2" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2008.2 0.00470355641106316 -0.003 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15676( 3) - 18-Mar-2019 19:36:08 - [ 3] Visit: 01 Visit Requirements: ORIENT 75D TO 85 D On Hold Comments: Additional Comments: There is a H=12.3 star a spatial separation of 4.8arcsec and PA=325.7 degree from the target. In order to avoid bleeding and diffraction spikes we chose ORIENT constraints. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSRB1052-52 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF POS TARG 0.0, 0.0 CUM (699.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PSRB1052-52 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF POS TARG 0.858, 0.083 CUM (699.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PSRB1052-52 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP100 1 DEF POS TARG 0.497, 0.647 CUM (599.232 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 PSRB1052-52 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP25 1 DEF POS TARG 0.0, 0.8 CUM (224.234 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 PSRB1052-52 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP25 1 DEF POS TARG 0.858, 0.883 CUM (224.234 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 PSRB1052-52 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP25 1 DEF POS TARG 0.497, 1.447 CUM (199.233 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSRB1052-52 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM PSRB1052-52 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM PSRB1052-52 3 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM PSRB1052-52 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM PSRB1052-52 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 15676( 3) - 18-Mar-2019 19:36:08 - [ 4] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSRB1052-52 6 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 15676( 3) - 18-Mar-2019 19:36:08 - [ 5] Summary Form for Proposal 15676 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, NSAMP=13, SAMP-SEQ=STEP100, SAMP-SEQ=STEP25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 75D TO 85 D, POS TARG 0.0, 0.0, POS TARG 0.0, 0.8, POS TARG 0.497, 0.647, POS TARG 0.497, 1.447, POS TARG 0.858, 0.083, POS TARG 0.858, 0.883 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names PSRB1052-52 ------------------------------------------------------------------------------------------------------------------------------------