0 Assigned ID: 653 ----- Attempting Submission 1 (Fri Mar 06 18:45:25 GMT 2020) ----- HST Phase I Proposal 653 successfully submitted. Receipt: # 653-1 0 ----- Attempting Submission 1 (Mon Jun 29 14:02:52 GMT 2020) ----- Heavy Metal Bands: A Study of Ions Escaping from the Hottest Jovian Atmospheres HST is the only facility capable of probing the uppermost planetary layers in the ultraviolet, which is key to understanding and modeling the vigorous atmospheric mass-loss seen in highly irradiated exoplanets. Recent HST NUV observations of an ultra hot Jupiter (UHJ) have definitively shown that ionized heavy elements including iron and magnesium are driven by atmospheric escape beyond the Roche lobe. These observations indicate the gas is not gravitationally bound to the planet, resulting in enormous signals when seen in transit. These ionized species may be hydrodynamically escaping or could be magnetically confined to the planet. Here we propose to observe escaping ions from the atmospheres of two ultra-hot Jupiters orbiting two of the most UV-bright exoplanet host stars. By observing in the NUV, we can compare the escape rates of heavy elements, measure the velocity profiles, and determine the extent to which the Roche lobe is filled of several UHJs orbiting different spectral type host stars, thus testing mass-loss mechanisms across differing XUV irradiation levels. We will also search for asymmetries in the NUV transit light curves, which will constrain post-cometary evaporation tails and magnetically controlled outflow. All 4 visits observe an exoplanet transit event. The spirit of exoplanet transit observations is to attempt to gather as many spectra as possible before, during, and after a transit event with each image as identical as possible. As a transit observation consists of measuring a differential drop in stellar flux during the event, identical exposures are resistant to uncertainties in flat-fielding and very high photometric precisions are achievable. The STIS/E230M observations require 5 orbit visits, as the baseline stellar flux and instrument systematics need to be measured before and after the transit/eclipse event, with the transit/eclipse event taking about 2.5 orbits orbits and is phase constrained to occur mid-way through the visit. We will observe two transits of two different targets (for a total of 4 observed transits/visits). For each target, we seek to offset the phase constraints to obtain full coverage of the transit, allowing us to measure possible asymetries in the transit shape, which has important science consequences. In the event of Reduced Gyro mode, scheduling of our phase-constrained observations will be the one major impact. Dr. Lothringer is an expert in both observing with HST/STIS, as well as atmosphere modeling with PHOENIX with extensive experience studying the highly irradiated class of ultra-hot Jupiters. Dr. Lothringer is PI of recently approved small Program 16086. Prof. Sing is an expert in the analysis and interpretation of HST datasets, particularly of exoplanets and with HST/STIS. Prof. Sing led the first study using our proposed observational setup to explore an ultra-hot Jupiter. Prof. Sing is also an expert in calculating atmosphere models to interpret HST observations, particularly with the ATMO code. Prof. Sing has been PI of several HST programs, including small, large, and Treasury programs. Dr. Wakeford is an expert in observing with HST, as well as with the theoretical interpretation of such data. This includes recent UV observations. Dr. Wakeford has been PI of multiple HST programs. Dr. Jeff Valenti is an expert in the stellar analyses that will be needed to interpret these data. Dr. Valenti has extensive experience with many aspects of exoplanet characterization. Dr. Valenti has been PI of many HST programs. Dr. Nikolov is an expert in exoplanet observation and and interpretation, with experience with ground-based and space-based datasets, including serving as an HST PI. Mr. Rustamkulov has experience in both modeling exoplanet transit spectra and observing with ground and space-based assets. Exoplanets and Exoplanet Formation 6 false false true false false false false SUPPORTED STAR A0-A3 V-IV EXTRA-SOLAR PLANET EXTRA-SOLAR PLANETARY SYSTEM NO This object was generated by the targetselector and retrieved from the SIMBAD database. Position and Proper motion from GAIA DR2. J2000 J2000 STAR A4-A9 V-IV EXTRA-SOLAR PLANET EXTRA-SOLAR PLANETARY SYSTEM NO Position and Proper motion from GAIA DR2. J2000 J2000 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. It is essential that all 5 orbits be scheduled in a continuous block. We have chosen WAVECAL=NO to avoid autowavecals at non-optimal times in the orbit and have scheduled wavecals manually, at the beginning of the visit and at the end of each orbit. (Tic-Visit :proposal-id 16270 :visit-id "01" :proposal-version -1 :trans-version "20200518" :date "29-Jun-2020 09:24:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 3444912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16270 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16270 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2807 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "01" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "01" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "01" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false 5 0 Target is too bright for F28X50LP (saturation < minimum exposure time), so we use F28X50OII with a 2.5 second exposure to get SNR~300. We use STIS/CCD for this, though STIS/CCD was not explicitly requested in Phase I. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. It is essential that all 5 orbits be scheduled in a continuous block. We have chosen WAVECAL=NO to avoid autowavecals at non-optimal times in the orbit and have scheduled wavecals manually, at the beginning of the visit and at the end of each orbit. 1605323237000 68.68145179844299 (Tic-Visit :proposal-id 16270 :visit-id "02" :proposal-version -1 :trans-version "20200518" :date "29-Jun-2020 09:24:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 3444912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16270 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2807 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false 5 0 Target is too bright for F28X50LP (saturation < minimum exposure time), so we use F28X50OII with a 2.5 second exposure to get SNR~300. We use STIS/CCD for this, though STIS/CCD was not explicitly requested in Phase I. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. It is essential that all 5 orbits be scheduled in a continuous block. We have chosen WAVECAL=NO to avoid autowavecals at non-optimal times in the orbit and have scheduled wavecals manually, at the beginning of the visit and at the end of each orbit. 1605586669000 70.3789266531268 (Tic-Visit :proposal-id 16270 :visit-id "03" :proposal-version -1 :trans-version "20200518" :date "29-Jun-2020 09:25:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 3444912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16270 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16270 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2749 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "03" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "03" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "03" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) false 5 0 Target is too bright for F28X50LP (saturation < minimum exposure time), so we use F28X50OII with a 6.0 second exposure to get SNR>300. We use STIS/CCD for this, though STIS/CCD was not explicitly requested in Phase I. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. It is essential that all 5 orbits be scheduled in a continuous block. We have chosen WAVECAL=NO to avoid autowavecals at non-optimal times in the orbit and have scheduled wavecals manually, at the beginning of the visit and at the end of each orbit. 1607445505000 58.5 (Tic-Visit :proposal-id 16270 :visit-id "04" :proposal-version -1 :trans-version "20200518" :date "29-Jun-2020 09:25:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 3444912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16270 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16270 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2749 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "04" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "04" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "04" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "04" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2696 :al-overhead-at-end 81 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) false 5 0 Target is too bright for F28X50LP (saturation < minimum exposure time), so we use F28X50OII with a 6.0 second exposure to get SNR>300. We use STIS/CCD for this, though STIS/CCD was not explicitly requested in Phase I. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~23.6 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. It is essential that all 5 orbits be scheduled in a continuous block. We have chosen WAVECAL=NO to avoid autowavecals at non-optimal times in the orbit and have scheduled wavecals manually, at the beginning of the visit and at the end of each orbit. HOPR (Tic-Visit :proposal-id 16270 :visit-id "02" :proposal-version -1 :trans-version "20200518" :date "29-Jun-2020 09:24:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 3444912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16270 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2807 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16270 :visit-id "02" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2786 :al-overhead-at-end 81 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false 5 0 Target is too bright for F28X50LP (saturation < minimum exposure time), so we use F28X50OII with a 2.5 second exposure to get SNR~300. We use STIS/CCD for this, though STIS/CCD was not explicitly requested in Phase I. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Exposure time calculated to get 10 frames per orbit (except the first orbit because of target acq) to obtain enough time fidelity to model the systemics and transit time series'. This results in an SNR of ~45.5 per frame at 2707 angstrom. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit. Auto-wavecal=NO, but we manually request wavecals at the beginning of the visit and then at the end of each orbit.