remove pos-targ on visit 05 to get all targets in the pickle. ----- Attempting Submission 4 (Thu Mar 03 18:12:00 GMT 2011) ----- ----- Attempting Submission 5 (Mon Mar 28 17:21:12 GMT 2011) ----- We propose observations of the newly discovered extrasolar planet XO-2b and its twin star XO-2. When combined with the transit light curve, the FGS-derived parallax will constrain the stellar mass of the host star XO-2. From the high signal-to-noise near-IR time series resulting from NICMOS grism spectroscopy, we will refine the system parameters, in particular radii of the star and planet. From the same data, we will search for evidence of water vapor in the atmosphere via transmission spectroscopy. Differential observations with NICMOS in the spectroscopic mode will be used to search for the small spectral changes that occur during planetary transits resulting from absorption of stellar light as it passes through the planetary atmosphere. Water is an important constituent, the detection of which would provide information on Oxygen, and it has a convenient strong band well-positioned for NICMOS.

This is an FGS parallax measurement of XO-2A and XO-2B. This proposal complements proposal 11228, in that it acquires the astrometric observations at the April 15 maximum parallax factor, while the observations in 11228 acquire the astrometry at the October maximum parallax factor. Note, the first epoch 11228 observations executed in October 2007, while the second epoch is scheduled for October 2008. This second epoch will likely not ocurr due to SM4. Therefore, the second October epoch will need to execute in 10/2009 (in three-gyro mode). IMPLEMENTION NOTES: the new parameter CAMERA-FOCUS=DEFOCUS and aperture NIC3-FIXD is used on all exposures to place the NIC3 focus mechanism at -0.5mm and adjust the target placement in the aperture for the defocus respectively. STAR FORMATION 12 false 0.0 0.0 false false false false SUPPORTED STAR F0-F2 N2302133722 J2000 00 00 0.0000 +00 00 0.00 J2000 STAR F0-F2 N2302133726 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC N2302133731 J2000 00 00 0.0000 +00 00 0.00 J2000 CALIBRATION ASTROMETRIC N23021133727 J2000 00 00 0.0000 +00 00 0.00 J2000 B=14.77 R = 13.15 CALIBRATION ASTROMETRIC N2302133718 J2000 00 00 0.0000 +00 00 0.00 J2000 B=14.14, R=13.09 CALIBRATION ASTROMETRIC N2302133716 J2000 00 00 0.0000 +00 00 0.00 J2000 B=13.41, R=12.45 CALIBRATION ASTROMETRIC N2302133714 J2000 00 00 0.0000 +00 00 0.00 J2000 B=12.94, R=11.89 CALIBRATION ASTROMETRIC N2302133736 J2000 00 00 0.0000 +00 00 0.00 J2000 B=14.6, R=13.38 CALIBRATION ASTROMETRIC N2302133738 J2000 00 00 0.0000 +00 00 0.00 J2000 B=15.7, R=14.4 CALIBRATION ASTROMETRIC N2302133720 J2000 00 00 0.0000 +00 00 0.00 J2000 B=15.14, R=14.12 NIC3 Spectroscopic No No G141 FGS POS No F583W The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1271136129000 100.0 (Tic-Visit :proposal-id 11792 :visit-id "04" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 15:22:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "05" :si-bright-earth-limb-angle 15.5 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11792 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11792 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2976 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3453 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1302166623000 105.0 (Tic-Visit :proposal-id 11792 :visit-id "05" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 15:20:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "05" :si-bright-earth-limb-angle 15.5 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11792 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11792 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3075 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3453 :pcs-gap 0 ) false 1 0