Adjusted observation times, timing constraints, and orbital parameters in order to accomodate the single gyro mode 688662203 ----- Attempting Submission 1 (Fri Jun 16 19:42:47 GMT 2023) ----- ----- Attempting Submission 2 (Thu Jul 18 18:57:08 GMT 2024) ----- HST Phase II Proposal 17312 successfully submitted. Receipt: # 17312-2 I am not sure how to get rid of the GS Acquisition Special Requirement Warning. However, I've looked through everything else and the rest seems okay. Refining the Mira Distance Ladder with NIRCam Observations of M101 The recent tension between direct, model-independent measurements of the Hubble constant and the model-dependent values inferred from observations of the CMB has posed the strongest challenge to LambdaCDM in nearly 30 years. However, the burden of proof for a potentially groundbreaking discovery of new physics is high. Thus, alternative routes to the present measurements of the Hubble constant -- which rely primarily on Cepheids and Tip of Red Giant Branch as intermediate distance indicators -- must be explored in order to verify the current results and to fully understand the role of systematic uncertainties. Oxygen-rich Mira variables are luminous, ubiquitous, NIR and IR standard candles and present a particularly compelling path forward to studying the tension in the era of JWST. Here, we propose to use the high angular resolution and infrared coverage of NIRCam to simultaneously refine the Mira-based distance ladder and re-examine Cepheid crowding in the Type Ia Supernova host galaxy M101. This will allow us to verify the Cepheid results by using an independent ladder subject to different systematics, and by directly reanalyzing the Cepheids in M101. In this joint proposal consisting of one epoch of JWST NIRCam and three epochs of coordinated HST WFC3/IR and ACS observations, we will (1) de-blend the backgrounds of known Cepheids and Miras in M101, (2) improve Mira spectral type classification, and (3) study the effect of dust and mass loss on the Mira PLR. The three HST epochs will allow us to phase the single-epoch JWST observations to mean magnitude and produce Mira PLR in JWST bands for the first time. We propose to observe Cepheids and Mira candidates in the nearby SN Ia host galaxy, M101, with NIRCam in 6 filters (F115W, F150W, F182M, F277W, F356W, and F444W). The observations will be taken in a single epoch. We also request 3 coordinated orbits (split into 3 epochs) of HST observations, one prior to, and one after the JWST obsservations. For HST, we propose WFC3/IR observations (in F160W and F110W filters) and parallel ACS F555W observations to determine the phases of the Miras and Cepheids respectively at the time of the JWST observations. These observations will allow us to produce Mira PLRs in the NIRCam filters, uncrowd the backgrounds of Cepheids and Miras previously observed in M101, improve our spectral classification of Miras, and reduce the uncertainty in the Hubble constant measurements of both methods. Caroline Huang: Expert in Mira-based distance ladder measurements and photometry using HST NIR data. Massimo Marengo: Expert in variable stars and evolved stars, including AGB and Miras. Warren Hack: Expert in photometric analysis. Wrote pipeline for reducing HST data. Wenlong Yuan: Expert in Cepheids, Miras, and photometric and time-series analysis. Louise Breuval: Expert in Cepheid metallicity and distance scale. Adam Riess: Has been leading the SH0ES Team. Extensive experience in leading large cosmological measurements, including with HST, experience in measuring supernovae, Cepheids, parallaxes, photometry, and astrometry. Is also a member of the WFC3 Team at STScI and is very familiar with its workings, spatial scanning measurements, etc. 6 false false false false false false false false SUPPORTED GALAXY SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 Timing link suitability includes constraints ([02 After 01]) The scheduling data was generated by CASM 32.1.3. 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