Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. Wavelength is a required field. Wavelength is a required field. Wavelength is a required field. 0 Assigned ID: 1231 ----- Attempting Submission 1 (Wed Sep 07 14:08:07 GMT 2016) ----- Joint Spitzer/Hst For the best data quality, it is strongly recommended that the maximum number of allowed FP-POS positions is used when observing at a given COS CENWAVE setting. See full description for details. REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE I made the following changes: (1) change the target acquisition to NUV ACQ/IMAGE PSA MirrorB (2) switch the G130M observations to 1291 using FP-POS=3 & 4 (3) change the G160M observations to use all four FP-POS (4) add timing constraints to ensure that the visit is not scheduled for execution while the planet is transiting the star -14130502 ----- Attempting Submission 1 (Wed Oct 05 20:40:27 GMT 2016) ----- ----- Attempting Submission 2 (Tue Jan 10 05:28:03 GMT 2017) ----- ----- Attempting Submission 3 (Sat Aug 26 14:19:43 GMT 2017) ----- The coordinates are ICRS (from SIMBAD) - this is not recognized by the APT, but I verified that it is correct. Recent observations of transiting planets have revealed that clouds and hazes are common in exoplanet atmospheres. Little is known, however, about how the clouds/hazes form, what their composition is, and how their properties vary with planet parameters. We propose to characterize the atmospheres of two exo-Neptunes, GJ 436b and GJ 3470b, both of which show evidence for clouds or hazes in their near-infrared spectra. We will measure precise 3.6 and 4.5 micron transit depths for these planets, to compare with existing high-precision data at shorter wavelengths. We will also obtain a UV spectrum for GJ 3470 with HST/COS to enable accurate models of the planet's photochemistry. These observations will enable us to distinguish at high confidence between a range of physically realistic models for the atmospheric chemistry, including methanogenic photochemical hazes and equilibrium salt/sulfide clouds. The measurements will enable comparative planetology with the handful of other small, cool worlds currently accessible to observation, and serve as a first assessment of the prevalence, origin, and composition of clouds and haze in metal-enriched atmospheres below 1000 K. Our findings will guide the design of future observations of increasingly Earth-like worlds with JWST. We will observe the spectrum of the M1.5-dwarf GJ 3470 with COS over the wavelength range 1150 - 3200 Angstroms. GJ 3470 is a faint target, so COS is superior to STIS at these wavelengths due to its greater sensitivity. We will use a combination of the G130M, G160M, and G230L gratings to acquire the complete spectrum. All data will be obtained in TIME-TAG mode so that we can constrain the star's flaring activity. We will use the FLASH=YES setting to maximize exposure time on target. These observations are based on the successful set-up used by the MUSCLES program to measure M-dwarf spectra (GO Programs 12464, 13640). We calculated exposure times needed to achieve a signal-to-noise SNR > 5 for major stellar emission lines in each grating (CII for G130M, C IV for G160M, and Mg II for G230L). We based our calculations on measurements of the spectrum of GJ 832 (an M-dwarf of similar spectral type) from the MUSCLES program (France et al. 2016). We assumed that GJ 3470 has the same instrinsic flux as GJ 832 and scaled the expected signal by the distance to the star (GJ 3470 is 6x more distant than GJ 832, so we expect a roughly 40x smaller signal). GJ 3470 is an active star, so these exposure times are conservative estimates and we expect the actual SNR to be greater than 5. The MUSCLES spectrum for GJ 832 has SNR of 75, 40, and 180, for the C IV, CII, and Mg II lines. These data were obtained with exposure times of 15119, 7671, and 2756s using the G160M, G160M, and G230L gratings, respectively. Based on these results and our expectations for the brightness of GJ 3470, we require 2419, 4310, and 77 s in G130M, G160M, and G230L for a total of 3 orbits accounting for time to acquire the target. Extrasolar Planets and Planet Formation 0 false false false false false false SUPPORTED STAR EXTRA-SOLAR PLANETARY SYSTEM M III-I NO J2000 J2000 COS/FUV Spectroscopic No No G130M COS/FUV Spectroscopic No No G160M COS/NUV Spectroscopic No No G230L 1503757138867 /private/var/folders/5j/qwc6_lgn4rz5sphtd1gssl340000gn/T/OPVisit5978695326412498640.xml Phase windows are not calculated when the gap between schedulable intervals is less than 1 days, assuming no scheduling restrictions for constraint Phase 0.050/0.950. The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14843 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "26-Aug-2017 10:18:58.0" :trans-errors '(:WARNINGS 8 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 139440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14843 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14843 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2883 :al-overhead-at-end 0 :internal-dur-at-end 57 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3216 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14843 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2994 :al-overhead-at-end 0 :internal-dur-at-end 48 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3216 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14843 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2994 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3216 :pcs-gap 0 ) true 3 0