16061( 4) - 08-Apr-2020 15:40:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16061 Version: 4 Check-in Time: 08-Apr-2020 15:40:42 STScI Edit Number: 1 Title The ultimate observing campaign for the Transitional ms X-ray PSRJ1023+0038 ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Sergio Campana INAF, Osservatorio Astronomico di Brera, Y Merate CoI: Maria Cristina Baglio New York University N CoI: Ms. Arianna Miraval Zanon INAF, Osservatorio Astronomico di Brera, Y Merate CoI: Francesco Coti Zelati Institute of Space Sciences (CSIC-IEEC) N CoI: Federico Vincentelli UNIVERSITA DEGLI STUDI DELL'INSUBRIA N CoI: Dr. Filippo Ambrosino INAF - Istituto di Astrofisica e N Planetologia Spaziali CoI: Dr. Paolo D'Avanzo INAF, Osservatorio Astronomico di Brera, N Merate CoI: Dr. Alessandro Papitto INAF, Osservatorio Astronomico di Roma N CoI: Dr. Piergiorgio Casella INAF, Osservatorio Astronomico di Roma N ------------------------------------------------------------------------------------ Abstract PSR J1023+0038 is a binary system that hosts a neutron star and a low-mass, main sequence companion star. It has been observed to switch on timescales of years between a radio millisecond pulsar state and a disc-dominated state, of uncertain origin. After its last switch to a disc-dominated state in 2013, the source has been the object of extensive multiwavelength monitoring campaigns, during which the continuous switch between three X-ray modes (high, low and flare) on timescales of 10 s has been observed. Here we propose the ultimate, strictly simultaneous, multi-wavelength campaign to study in detail this unique mode-switching phenomenon. We will involve NuSTAR, XMM-EPIC, Swift-UVOT, XMM-OM, VLT/HAWK-I, and VLA observations to probe models using correlations and lags (a profitable tool to study the emission mechanisms), as well as establish differences among the power spectra of the multi-band light curves. We will also track the elusive pulsations along the spectral energy distribution. ------------------------------------------------------------------------------------ Observations Description ------------------------ This visit will consist in two HST orbits during which we will carry out time-resolved NUV TIME-TAG spectroscopy with the STIS/NUV-MAMA/G230L instrument/grating combination. We will use the 2376 \AA setting for this observation to achieve continuous wavelength coverage between 1570 \AA and 3180 \AA, with the 52X0.2 slit. The TIME-TAG mode of STIS will provide a maximum time resolution of 125 $\mu$s, fast enough to resolve pulsations at the 1.6 ms (the neutron star spin period) in the Near-UV band. Our observations require strict simultaneity between HST and XMM-Newton observatories. It is essential to have simultaneous observations in the X-ray band so as to evaluate the system ephemerides at the epoch of the HST 16061( 4) - 08-Apr-2020 15:40:42 - [ 2] observations and restrict the parameter space for a sensitive search for UV pulsations. ------------------------------------------------------------------------------------ 16061( 4) - 08-Apr-2020 15:40:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PSR-J1023+00 STAR, ACCRETION DISK, RA=10H23M47.6840S, J2000 V = 17.31 +/- 0.3 38 LMXB, PULSAR DEC=+00D38'41.01" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16061( 4) - 08-Apr-2020 15:40:42 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: 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 PSR-J1023+0 STIS/CCD ACQ 50CCD MIRROR 1 5 S (5 S) 038 ------------------------------------------------------------------------------------------------------------------------------------ 2 PSR-J1023+0 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=680 1 2000 S 038 -MAMA G see below (2060 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PSR-J1023+0 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=680 1 2000 S 038 -MAMA G see below (2690 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 | ------------------------------------------------------------------------------------------------------------------------------------ PSR-J1023+0038 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A PSR-J1023+0038 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 2060.0 S -MAMA G PSR-J1023+0038 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2690.0 S -MAMA G 16061( 4) - 08-Apr-2020 15:40:42 - [ 5] Summary Form for Proposal 16061 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 50CCD, 52X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=680 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names PSR-J1023+0038 ------------------------------------------------------------------------------------------------------------------------------------