0Assigned ID: 1665
----- Attempting Submission 1 (Tue Mar 20 23:17:58 GMT 2018) -----
HST Phase I Proposal 1665 (phase1-MC-ALL.pdf.apt) successfully submitted.
Receipt: # 1665-1
----- Attempting Submission 2 (Wed Mar 21 10:11:49 GMT 2018) -----
----- Attempting Submission 3 (Thu Mar 22 15:13:50 GMT 2018) -----0----- Attempting Submission 1 (Thu May 31 21:14:09 GMT 2018) -----Backyard WorldsOver the past five years, our view of the local solar neighborhood has changed drastically thanks to the Wide Field Infrared Survey Explorer (WISE). Not only did WISE redefine the five closest systems to the Sun with the discovery of Luhman16AB and WISE0855, but it also revealed the Sun's closest fly by and it defined an entirely new class of extremely cold and close compact objects: the Y dwarfs. At present, all but two of the Y dwarfs were discovered through a WISE single epoch photometric identification. As a whole, these objects are of critical importance to identifying the efficiency of star formation at the lowest masses. As individuals, each of these objects represents a unique probe into the complex chemistry present in the coldest photospheres produced in the Universe. Every single Y dwarf discovered is an observational treasure but the ones that are closest to the Sun are the gold standard for planetary characterization studies. In February 2017, we launched a citizen science project called Backyard Worlds: Planet 9 with the intention of scanning the entire sky using not just photometric information but positional as well to identify the coldest, closest, and fastest moving objects near the Sun. In this Mid-Cycle HST proposal, we have identified 5 tantalizingly fast moving objects that appear to be extremely cold hence potentially among the Sun's nearest neighbors. We ask for five orbits with HST to obtain critical F125W and F105W photometry which will allow us to decipher the nature of each target and prioritize for a JWST cycle 1 follow-up.Our observations are straightforward and have been proven successful by prior HST Y dwarf follow-up programs (see results and summary of Y dwarf HST observations of known Y dwarfs in Schneider et al. 2015). We used known Y dwarfs and their F105W as well as F125W filter measurements from JWST to scale the estimates for our new candidate objects. Assuming a required S/N=30, as well as a (F125W-W2)=7 and a (F105W-F125W)=0, we estimate a requirement of 0.5 orbit per filter per target for a total of 5 orbits.Planets and Planet FormationStellar Physics3falsefalsefalsefalsefalsefalsefalseSUPPORTEDSTARBROWN DWARFNo V-magnitude is available. The magnitude listed is the estimated F125W magnitude.J2000J2000STARBROWN DWARFNo V-magnitude is available. The magnitude listed is the estimated F125W magnitude.J2000J2000STARBROWN DWARFNo V-magnitude is available. The magnitude listed is the estimated F125W magnitude.J2000J2000STARBROWN DWARFNo V-magnitude is available. The magnitude listed is the estimated F125W magnitude.J2000J2000STARBROWN DWARFNo V-magnitude is available. The magnitude listed is the estimated F125W magnitude.J2000J2000WFC3/IRImagingNoNoF105WWFC3/IRImagingNoNoF125WWFC3/IRImagingNoNoF105WWFC3/IRImagingNoNoF125WWFC3/IRImagingNoNoF105WWFC3/IRImagingNoNoF125WWFC3/IRImagingNoNoF105WWFC3/IRImagingNoNoF125WWFC3/IRImagingNoNoF105WWFC3/IRImagingNoNoF125WPOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN1false/private/var/folders/6l/d2vtb4894bs5t3xhhq13gv3h00023n/T/OPVisit1246276531519690475.xmlThe scheduling data was generated by CASM 26.2.CASM was run in Phase II mode.F105W and F125W observations of W0014+7951.1534007393000221.11729109578238(Tic-Visit
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