0Assigned ID: 1551
----- Attempting Submission 1 (Sat Sep 30 02:01:36 GMT 2017) -----
HST Phase I Proposal 1551 (firsttry.apt.2017_04_05_20_02.aptbackup.apt) successfully submitted.
Receipt: # 1551-1I updated the phase between argument, this is a very minor change, otherwise i am happy with the other APT settings being the same as the previous visit.495935436----- Attempting Submission 1 (Wed Dec 06 00:12:22 GMT 2017) -----
HST Phase II Proposal 15428 (15428_PHASE2_1024ARRAY.apt) successfully submitted.
Receipt: # 15428-1
----- Attempting Submission 2 (Wed Dec 13 22:43:18 GMT 2017) -----
HST Phase II Proposal 15428 (15428_PHASE2_1024ARRAY.apt) successfully submitted.
Receipt: # 15428-2
----- Attempting Submission 3 (Thu Dec 14 22:57:44 GMT 2017) -----
HST Phase II Proposal 15428 (15428_PHASE2_1024ARRAY.apt) successfully submitted.
Receipt: # 15428-3
----- Attempting Submission 4 (Wed Jan 24 19:42:36 GMT 2018) -----
----- Attempting Submission 5 (Wed May 23 18:28:17 GMT 2018) -----
----- Attempting Submission 6 (Mon Jun 04 19:05:09 GMT 2018) -----
----- Attempting Submission 7 (Tue Mar 19 19:14:24 GMT 2019) -----
HST Phase II Proposal 15428 (retry.apt) successfully submitted.
Receipt: # 15428-7
----- Attempting Submission 8 (Tue Apr 02 18:45:14 GMT 2019) -----
----- Attempting Submission 9 (Thu Jan 23 00:57:40 GMT 2020) -----
HST Phase II Proposal 15428 (resubmit_apt) successfully submitted.
Receipt: # 15428-9
----- Attempting Submission 10 (Tue Sep 22 00:59:17 GMT 2020) -----Sub-Neptune Atmosphere Characterization in a Multi-Planet SystemWe propose to observe two transits of the planet GJ9827b, which was recently discovered in K2 Campaign 12. The planet is part of a multiplanet system containing three small planets, details of which were announced in September 2017. GJ9827b is one of the top five most amenable small planets for atmospheric follow-up. A second planet in the system (GJ9827d) is also likely to show a strong atmospheric signal and will be observed in HST proposal 15333. GJ9827b lies near the theoretical boundary between gassy and rocky planets, suggesting it may have a rich atmosphere. These two targets present unique opportunities to characterize the atmospheres of small sub-Neptune planets, constrain their properties and intercompare atmospheres in the same system. With JWST Cycle 1 beginning in 2019, these will make excellent candidates for follow-up if HST can provide proof that they are water-rich and cloud-free. By observing GJ9827b now we can use HST data to compare two planets in the same system and prepare for useful, efficient JWST observations with NIRCam.We will observe two transits of GJ9827b using WFC3 with the IR G141 grism. The observations will be split into two visits of 5 orbits each, (similar to what has been attempted by several other exoplanet atmosphere proposals.) The observations MUST be scheduled during a transit of GJ9827b. Though unlikely, the observation must not be scheduled during a 'double' transit with any of the other planets, as this will interfere with the signal. This has been avoided by adding 'betweens' in APT which exclude transits of other (known) planets occuring within 8 hours of the observation.
We will use the F126N filter to take a wavelength calibration image once per visit, at the beginning of the visit. We will use the forward/reverse scanning mode during the observation for maximum efficiency. We will use the full 1024 array and a slow scan rate to capture as many photons as possible. A scan rate of 0.21 arcsec/s has been chosen, which we anticipate will give a flux of 29000 on each pixel. The use of the full array allows us to collect data and dump to the SSR in parallel, maximising the amount of time on source.
There is a tight timing constraint on our observation to ensure the planet transit occurs in the middle of the fourth orbit. This will ensure we collect the most 'in-transit' points possible.
One of our scans has a lower NSAMP number than the rest (Spatial Scan 1.004). This is due to the guide star acquisition at the beginning of the visit reducing the time we have available in the first orbit. The lower NSAMP (and different POSTARG keywords) allows us to take a grism image with a reduced exposure time.
There is another proposal (15434) which will be using the STIS camera to observe the outer atmosphere of the planet. Having spoken with the PI, we would ideally like to take our observations as close as possible to each other. This will allow for measurements of the lower atmosphere (this proposal with WFC3) and upper atmosphere (15434 with STIS) to be compared, as stellar variability can impact the atmosphere. We propose that the first visits from each proposal are scheduled for two consecutive transits of GJ9827b. We then request a break in the observations to allow the transit ephemeris to be measured using the first set of data. This will improve our ability to center the transit. We then propose the second round of visits for each proposal be scheduled for consecutive transits.Planets and Planet Formation3falsefalsefalsefalsetruefalsefalseSUPPORTEDSTAREXTRA-SOLAR PLANETEXTRA-SOLAR PLANETARY SYSTEMNOThis object was generated by the targetselector and retrieved from the SIMBAD database.BD-02-5958J2000TYPE=K6V, B-V=1.47, E(B-V)=0, F-LINE(2796)=0.20e-12, W-LINE(2796)=0.5, F-LINE(1215)=0.34e-12, W-LINE(1215)=0.65WFC3/IRImagingNoNoF139MWFC3/IRSpectroscopicNoNoG141The scheduling data was generated by CASM 28.2.CASM was run in Phase II mode./private/var/folders/yn/f2r51bxd7pj58243x2y_c6340000gn/T/OPVisit8788363465169061103.xmlShort Scans for visit 2 with spars100, nsamp 2.
Calibration star is 384 pixels away from the target star153752924700066.0(Tic-Visit
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Betweens have been set such that transits where other planets (GJ 9827c/d) transit or eclipse within 0.2 days of GJ 9827 b have been excluded. This ensures a clean observation of the transit.
Phase argument has been set to allow 15 minutes of possible time to schedule. It is beneficial to our science case to schedule the observations as close to phase 0.82987074 as possible.156949482100066.9228335649959(Tic-Visit
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