This proposal is for pure parallel orbits. Two demonstrative observations around the intended targets were included for the proposal (summing to 2 orbits). If additional detail is required, please contact the PI! 2066910367 Assigned ID: 772 ----- Attempting Submission 1 (Fri Apr 05 21:13:18 GMT 2019) ----- HST Phase I Proposal 772 (Cyc27_IR_TRGB_Calib_1pmFriday.pdf.apt) successfully submitted. Receipt: # 772-1 ----- Attempting Submission 2 (Fri Apr 05 22:46:54 GMT 2019) ----- HST Phase I Proposal 772 (Cyc27_IR_TRGB_Calib_1pmFriday.pdf.apt) successfully submitted. Receipt: # 772-2 ----- Attempting Submission 3 (Fri Apr 05 22:51:21 GMT 2019) ----- ----- Attempting Submission 4 (Sun Apr 07 03:38:32 GMT 2019) ----- The number of orbits used exceeds the number allocated Added 2DFS-3694 parallel visit. -1167778744 ----- Attempting Submission 1 (Fri May 08 19:00:40 GMT 2020) ----- ----- Attempting Submission 2 (Wed May 20 15:34:09 GMT 2020) ----- ----- Attempting Submission 3 (Mon Jun 29 19:40:20 GMT 2020) ----- ----- Attempting Submission 4 (Mon Jul 06 20:01:59 GMT 2020) ----- ----- Attempting Submission 5 (Fri Jul 17 16:32:32 GMT 2020) ----- ----- Attempting Submission 6 (Wed Oct 21 19:48:36 GMT 2020) ----- ----- Attempting Submission 7 (Tue Dec 29 21:27:46 GMT 2020) ----- A new parallel opportunity has been offered that was not accounted for in the original orbit allocation. Securing the Absolute Scale for the IR-TRGB Distance Ladder The tension in the value of the Hubble constant as derived from the distance scale in the local universe and modeled from the anisotropies in the Cosmic Microwave Background continues to grow. While theoretical reasons for the tension are being explored, determining if systematics within rungs of the distance scale is the cause of the tension requires the use of independent techniques. Of late the tip of the red giant branch (TRGB) has provided a key test of the calibration of type supernova Ia by Cepheids and has not yet revealed a systematic effect at this stage. Another concern is both expanding the Supernova Ia calibration sample, itself, and expanding the sample beyond star-forming hosts due to variance in the supernova with host properties. The TRGB applied in the infrared is poised to be a powerful tool to probe ever larger volumes and reach a wider set of supernova Ia hosts. However, anchoring the IR-TRGB is challenging because the two primary systems, the Milky Way and the Large Magellanic Cloud, only have observations in the 2MASS filter system. Comparison of IR-TRGB calibrations from the ground suggests that there are strong differences between the WFC3/IR and 2MASS filter system that are hard to reconcile at distance-ladder required precision. Here pure parallel orbits in Large and Small Magellanic Cloud are proposed to produce a robust filter-calibration to secure the foundation for the IR-TRGB distance scale. The proposal uses a combination of IR imaging and spectroscopy to enable a broader set of calibrations for other facilities where the IR-TRGB can be applied. This proposal observes with WFC3/IR in pure parallel mode. It will attempt to obtain 3-band photometry using the shortest exposures possible and 2-grisms for a set of fields in the LMC and SMC. The observations will have multiple reads to help with random errors and multi-visit fields will be used to constrain systematic errors. The specifications of MULTIACCUM are set to keep the targets from saturating and, if possible, minimize the systematics due to persistence and non-linearity. This team combines scientific and technical experience from the Carnegie-Chicago Hubble Program (CCHP, PI: Freedman; Madore, Rich, Seibert, Beaton, Hoyt, Neeley, Monson), the ACS Nearby Galaxies (ANGST) and related programs (PI: Dalcanton; Durbin), and ground-based efforts in the Large Magellanic Cloud (Nidever, Beaton) to adequately cover the range of expertise required for this program. First, the CCHP has been producing high-precision distances using the tip of the red giant branch in the optical and begun branching into the first precision application of the technique in the infrared (Madore, Hoyt, Freedman, Beaton). A pipeline has been constructed that fully reduces raw frames and produces systematics-controlled photometry for objects over a range of 16 magnitudes in distance modulus (Beaton, Seibert, Hoyt). The pipeline is being expanded to contain a module for WFC3/IR using data obtained in the CCHP program (Beaton, Seibert, Neeley). The CCHP obtained direct observations with WFC3/IR of bright RR Lyrae stars obtained in special observing modes and requiring special analyses (Rich, Beaton, Seibert). Second, the ACS Nearby Galaxies programs have accumulated extensive multi-instrument HST observations for dozens of objects in the nearby universe (Dalcanton, Durbin). Currently, the WFC3/IR data is being systematically reprocessed in combination with higher spatial resolution ACS observations with the goal of better constraining the IR-TRGB in these more distant objects via an archival proposal (PI Durbin). Durbin worked at STScI as a post-bac and has extensive technical expertise with WFC3/IR. Third, our spectroscopic experience stems from numerous on-going projects probing the Galaxy and its neighbors in the Local Group. Noteworthy experience in the NIR at medium resolution via the Sloan Digital Sky Survey III sub-survey APOGEE2, which contains an expansive program covering the Magellanic Clouds (Nidever, Beaton). Team members have access to facilities in the southern hemisphere to obtain complementary data if required (either higher precision photometry or stellar characteristics from spectroscopy) using Las Campanas Observatory (Beaton, Rich, Madore, Seibert), existing survey data from the Sloan Digital Sky Survey (Beaton, Nidever) or the Magellanic Periphery Surveys with the Dark Energy Survey Camera (Nidever). 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