Visit 0000001 requires 10139.0 seconds but separated by less than 4320.0 seconds from Visit 0000002 Visit 0000003 requires 10139.0 seconds but separated by less than 4320.0 seconds from Visit 0000004 0 Assigned ID: 4350 ----- Attempting Submission 1 (Wed May 24 14:58:08 GMT 2023) ----- HST Phase I Proposal 4350 successfully submitted. Receipt: # 4350-1 ----- Attempting Submission 2 (Wed May 24 23:36:28 GMT 2023) ----- Our science program requires accurate PSF subtracton which means the science target and PSF reference star should be observed in non-interrupted consecutive orbits. We therefore input a very small AFTER constraint which is a standard method to achieve our goal. ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN This apt is revised following the very helpful comments and recommendations from John Debes. This includes: (1) Using a subarray for the BAR5 observations (2) Refining the ORIENTs and exposure times (3) Using the SIMBAD fixed target resolver to confirm all coordinates and proper motions are correct. Submission May 13, 2024, revised the Visit 3 ACQ exposure to F25ND3, 0.2 sec (previous was F25ND5, 4.0 sec). Submission May 23, 2024. Had to revise the ORIENTs for HD 170773 (Visits 5,6,8) because the old ORIENTs would not schedule contiguous orbits with the PSF reference star (Visit 7) due to FGS occultation. In this submission, we changed the ORIENTs so they are schedulable contiguously in September 2024 and also adjusted the coronagraphic aperture to be WEDGEA1.8. Submission July 11, 2024 Had to revise the ORIENTs for HD 170773 (Visits 5,6,8) because the old ORIENTs would not schedule in 1-gyro mode. 241645795 ----- Attempting Submission 1 (Thu Sep 14 18:44:26 GMT 2023) ----- ----- Attempting Submission 2 (Fri Oct 13 06:07:21 GMT 2023) ----- ----- Attempting Submission 3 (Mon May 13 21:01:43 GMT 2024) ----- ----- Attempting Submission 4 (Thu May 23 22:12:41 GMT 2024) ----- ----- Attempting Submission 5 (Thu Jul 11 14:58:53 GMT 2024) ----- The errors apply to orbits already executed. Capturing the signatures of planets shaping two large-radius debris belts unveiled with ALMA Compared to ALMA, JWST, and ground-based AO systems, HST stands out with its unparalleled ability to provide optical images of nearby debris disks at the highest resolution across wide angular scales. While scattered-light imaging has unveiled several dozen disks, most are either too distant or too small to reveal fine-scale features associated with planet-disk interactions. However, the largest disks surrounding the nearest stars present unique opportunities for detailed investigations, such as with Beta Pic, Fomalhaut, and AU Mic. Recent lower-resolution ALMA maps have identified two additional nearby disks as compelling candidates for HST imaging. Their belt-like morphologies at >5" radius suggest possible dynamical perturbations caused by sub-stellar objects orbiting within. In this proposal, we aim to conduct STIS coronagraphic observations of these targets to detect dust-scattered light from each debris belt at a resolution 4-20 times higher than that provided by ALMA. Our primary scientific objective is to identify predicted disk structures resulting from dynamic interactions with hypothesized planets. By precisely measuring the inner and outer belt radii, edge sharpness, stellocentric offsets, and azimuthal clumps, we can infer the masses and orbital elements of sub-stellar objects. The outcomes of this survey will pinpoint the most promising targets for future JWST observations, capable of directly detecting sub-Jupiter mass planets and resolving the thermal structure of each disk. When combined with HST data, the comprehensive multi-wavelength dataset will allow us to quantify the physical properties of constituent grains and examine their spatial variations. This is a high-contrast imaging program to detect the dusty debris belts around HD 105211 and HD 170773 using reference and angular differential imaging. There are two PSF stars spectrally matched to the two science targets. Each science target is observed in 3 visits (orbits) with ORIENT constraints to place the debris belts away from the occulting elements and diffraction spikes. There is an ORIENT FROM command to achieve angular differential imaging. The PSF reference stars do not have any ORIENT constraints. In order to minimize PSF variations between orbits, each science target and its PSF reference star are observed in a sequence of orbits using a sequence constraint set to 3.8 orbits so that the 4 orbits are executed consecutively and without interruptions. HD 105211 and its PSF star HD 101132 are acquired behind both WEDGEB1.8 and BAR5, whereas HD 170773 and its PSF star HD 153377 are acquired only behind WEDGEA1.0. Dr. Tom Esposito has worked extensively in the observations, data reduction, and modeling of debris disks using GPI, Keck, and HST. Dr. Gaspard Duchene is an expert on high-contrast imaging and the MCFOST radiative transfer code that we will use to extract the geometry of each disk, its grain properties, or upper limits in the cases of non-detections. Prof. Paul Kalas specializes in the science of debris disks and exoplanets, with expertise in high-contrast imaging methods (observations, data reduction, and analysis) using all of HST's past and present imaging cameras. He has extensive experience designing large and long-term surveys, managing teams spread over multiple institutions, and mentoring graduate students and postdocs. Dr. Brenda Matthews was the PI of the Herschel Key Program DEBRIS. She has expertise in far-infrared and submm/mm observations and analysis. Professors Mark Wyatt and Grant Kennedy both have extensive experience analyzing and interpreting debris disk data from the optical (e.g., HST) to the millimeter (e.g., ALMA) and are recognized as leaders in the interpretation of debris disk physics. Dr. Luca Matra is an expert in obtaining and modeling ALMA observations of debris disks and supervises the research of Mr. Aldo Sepulveda on the ALMA detection of the HD 170773 debris disk. Dr. Sebastian Marino is an expert in obtaining and modeling ALMA observations of debris disks. Dr. Robert De Rosa is an expert in high-contrast imaging and data reduction. Aldo Sepulveda is a graduate student with expertise in ALMA maps of debris disks. Exoplanets and Exoplanet Formation 6 false false false false false false false false SUPPORTED STAR DISK EXTRA-SOLAR PLANETARY SYSTEM This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR F3-F9 This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR DISK EXTRA-SOLAR PLANETARY SYSTEM F3-F9 This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR F3-F9 This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STIS/CCD Imaging Yes No WEDGEB1.0 STIS/CCD Imaging Yes No BAR5 STIS/CCD Imaging Yes No WEDGEB1.0 STIS/CCD Imaging Yes No WEDGEB1.0 STIS/CCD Imaging Yes No WEDGEB1.0 Timing link suitability includes constraints ([Sequence (01 02 03 04) within 0.3 days]) The scheduling data was generated by CASM 32.1.1. 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