12868( 3) - 28-Aug-2012 17:29:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12868 Version: 3 Check-in Time: 28-Aug-2012 17:29:14 STScI Edit Number: 0 Title Unveiling the giant jet from Sanduleak's star in the Large Magellanic Cloud ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Rodolfo Angeloni Pontificia Universidad Catolica de Chile Y CoI: Dr. Mario Livio Space Telescope Science Institute N CoI: Dr. Romano L.M. Corradi Instituto de Astrofisica de Canarias N CoI: Dr. Francesco Di Mille University of Sydney N CoI: Prof. Joss Bland-Hawthorn University of Sydney N CoI: Dr. David Osip Carnegie Institution of Washington N ------------------------------------------------------------------------------------ Abstract An exceptionally large jet was recently discovered around the enigmatic LMC source known as Sanduleak's star (Angeloni et al. 2011 ApJ 743, L8). To our knowledge, with a physical extent of 14 parsecs, it represents the largest stellar jet ever discovered, and the first clearly resolved stellar jet beyond the Milky Way. Because of these exceptional properties, we expect that it will become a key target where to study the formation and evolution of astrophysical jets. While the ground based images have highlighted the exceptional nature of the source and its gross morphology, their limited resolution prevents a thorough discussion of the jet's properties, origin and expansion through the surrounding environment. In order to largely improve our knowledge of the system, we propose here to obtain deep, narrow-band images in the Halpha (F656N), [NII] (F658N) and [SII] (F673N) emission lines by exploiting both the superb spatial resolution and large field of view of WFC3/UVIS. With a reasonably short amount of telescope time, the HST observations would provide immediate scientific results, would help in the preparation of follow-up spectroscopic proposals, and would have a high PR value, considering both the outstanding properties of the jet of Sanduleak's star, and the likely spectacular outcome of the proposed imagery. ------------------------------------------------------------------------------------ Observations Description ------------------------ Recently, we have discovered a remarkable jet from a puzzling source in the LMC that is commonly known as Sanduleak's star (Angeloni et al. 2011 ApJL, 743, 8). With a physical extent of 14 parsecs, it is the largest stellar jet ever discovered, and the first resolved stellar jet beyond the Milky Way. Given these remarkable characteristics, we had proposed to obtain with HST deep, narrow-band images of the Halpha, [NII]6583, and [SII]6731 emission lines, in order to derive the fundamental physical diagnostics of the jet by making advantage of both the superb spatial resolution and large field of view of WFC3/UVIS. The jet total extension of 58 arcsec means that we can use the subarray UVIS 1 to place the central, bright source (V=17.4+-0.1) at the optimum center of CCD 12868( 3) - 28-Aug-2012 17:29:14 - [ 2] 1. We also introduced an orientation constraints in order to keep the jet axis (PA 71°) as much parallel as possible to the chip major axis. In order to increase the efficiency of the observations - i.e., by both avoiding the large overheads due to the duffer bump and maximizing the time on target - we opt for the WFC3-UVIS-DITHER-BOX dither pattern. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12868( 3) - 28-Aug-2012 17:29:14 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-SANDULE EXT-STAR, EJECTA, RA=05H45M19.5690S +/- 0.1", J2000 V = 270 V = 17.4 +/- 0.10 AKS-STAR EMISSION LINE NEBULA, DEC=-71D16'6.72" +/- 0.1" INTERACTING BINARY, JET, SYMBIOTIC STAR Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. The object is in the Large Magellanic Cloud. ------------------------------------------------------------------------------------------------------------------------------------ 12868( 3) - 28-Aug-2012 17:29:14 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 12868( 3) - 28-Aug-2012 17:29:14 - [ 5] Visit: 01 Visit Requirements: ORIENT 105D TO 120 D; ORIENT 280D TO 300 D On Hold Comments: Additional Comments: We introduced a visit orientation constraint in order to keep the jet axis (PA 71°) as much parallel as possible to the chip major axis. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-SANDUL WFC3/UVI ACCUM UVIS1 F656N FLASH=12 1 700 S PATTERN 1 1-3 EAKS-STAR S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-SANDUL WFC3/UVI ACCUM UVIS1 F658N FLASH=12 1 700 S EAKS-STAR S see below ------------------------------------------------------------------------------------------------------------------------------------ 3 NAME-SANDUL WFC3/UVI ACCUM UVIS1 F673N FLASH=12 1 700 S EAKS-STAR S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-SANDULEAKS-STA 1 WFC3/UVI ACCUM UVIS1 F656N 1 none none none 1 204.0 S R S NAME-SANDULEAKS-STA 1 WFC3/UVI ACCUM UVIS1 F656N 2 none none none 1 404.0 S R S NAME-SANDULEAKS-STA 1 WFC3/UVI ACCUM UVIS1 F656N 3 none none none 2 832.0 S R S NAME-SANDULEAKS-STA 1 WFC3/UVI ACCUM UVIS1 F656N 4 none none none 3 1232.0 S R S NAME-SANDULEAKS-STA 2 WFC3/UVI ACCUM UVIS1 F658N 1 none none none 1 804.0 S R S NAME-SANDULEAKS-STA 2 WFC3/UVI ACCUM UVIS1 F658N 2 none none none 2 532.0 S R S NAME-SANDULEAKS-STA 2 WFC3/UVI ACCUM UVIS1 F658N 3 none none none 2 294.0 S R S NAME-SANDULEAKS-STA 2 WFC3/UVI ACCUM UVIS1 F658N 4 none none none 3 1232.0 S R S NAME-SANDULEAKS-STA 3 WFC3/UVI ACCUM UVIS1 F673N 1 none none none 1 1405.0 S R S NAME-SANDULEAKS-STA 3 WFC3/UVI ACCUM UVIS1 F673N 2 none none none 2 1270.0 S R S NAME-SANDULEAKS-STA 3 WFC3/UVI ACCUM UVIS1 F673N 3 none none none 3 232.0 S R S NAME-SANDULEAKS-STA 3 WFC3/UVI ACCUM UVIS1 F673N 4 none none none 3 232.0 S R S 12868( 3) - 28-Aug-2012 17:29:14 - [ 6] Summary Form for Proposal 12868 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 105D TO 120 D, ORIENT 280D TO 300 D, PATTERN 1 1-3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N, F658N, F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NAME-SANDULEAKS-STAR ------------------------------------------------------------------------------------------------------------------------------------