In this revision we have adjusted the target offset for GJ 86B based on our recent WFC3 image, and have also slightly the ORIENT angle for Visit 2. Visit 2 is now ready to be scheduled. -- H. E. Bond 4/2/12 ----- Attempting Submission 7 (Mon Mar 05 19:07:40 GMT 2012) ----- HST Phase II Proposal 12548 (gj86_v3.apt) successfully submitted. ----- Attempting Submission 8 (Wed Mar 07 14:42:11 GMT 2012) ----- ----- Attempting Submission 9 (Mon Apr 02 20:29:33 GMT 2012) ----- See submission comments An intriguing characteristic of the known exoplanets is the existence of gas giants in moderately close binary systems. Among these planet-hosting binaries, the HR 637 (GJ 86) system is particularly interesting; the exoplanet GJ 86b executes a 0.1 AU orbit about an early K dwarf that is in turn bound to a white dwarf near 20 AU. The progenitor of GJ 86B was originally the more massive stellar component, orbiting near 12 AU until post-main sequence mass loss expanded its separation. This picture presents a gravitational challenge to planet formation at GJ86A: how does a giant planet form around a solar-mass star in such close proximity to an intermediate-mass star? Also, did GJ 86b form at the same epoch as the stars, or during the post-main sequence evolution of the secondary? To model the formation of GJ 86b, a knowledge of the current and primordial stellar masses and separations is required. We propose WFC3 imaging of this high-contrast, 2 arcsec binary in several bandpasses, and subsequent STIS optical spectroscopy of the white dwarf GJ 86B. The imaging is essential to determine the precise location of the companion for STIS spectroscopy, while the broad-band colors will yield the temperature of the white dwarf. The spectroscopy will reveal the atmospheric composition -- including refractory pollutants -- of the white dwarf, and together with its known parallax, determine its radius and mass, the mass of its progenitor, the original binary separation, and total system age. From these data, we will be able to strongly constrain planet formation scenarios in this relatively close binary, and potentially obtain evidence of terrestrial planets within the system. WFC3 imaging observations over 1 orbit must be both executed and analyzed prior to STIS scheduling, which entails spectroscopy for the subsequent 2 orbits. The WFC3 image analysis will determine the precise binary offset and absolute position for spectroscopy of the faint stellar companion to the bright primary in this Sirius-type system. The WFC3 and STIS observations must be done so that bleeding columns and diffraction spikes from the bright primary do not affect the faint companion. For the WFC3 imaging, we have constrained the ORIENT parameter so that the companion should fall within +- 10 degrees of the same array row as the bright primary. For STIS spectroscopy, we have done the same based on the expected PA of the companion, but expect to more precisely constrain the ORIENT parameter after analyzing the WFC3 data. We have put the STIS visits on hold until the completion of the WFC3 observations and analysis. EXTRA-SOLAR PLANETS 12 false 0.0 0.0 false false false false SUPPORTED STAR K V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. HR637A HD13445A J2000 J2000 STAR LATE-TYPE DEGENERATE Offset values currently are from an approximate visual orbit by Lagrange et al. These will be improved after we obtain the WFC3 images. New offset values based on WFC3 frames entered 4/2/12 by H. E. Bond HR637B HD13445B J2000 WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F625W WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W STIS/CCD Spectroscopic No No G430L 4300 STIS/CCD Spectroscopic No No G430M 3936 STIS/CCD Spectroscopic No No G750M 6581 POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false POS-TARG DITHER 0.40624 LINE false true 3 90.0 STIS-ALONG-SLIT 3 false POS-TARG DITHER 0.40624 LINE false true 4 90.0 STIS-ALONG-SLIT 4 false Timing link suitability includes constraints ([02 After 01 by 14.0 to 140.0 days]) The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. 1333396814214 /var/tmp/OPVisit60592475844575339.xml ORIENT angles are specified to avoid faint companion lying near diffraction spikes or bleeding columns of bright primary, for expected PA of 84 degrees. 1333156764000 152.8988807781207 (Tic-Visit :proposal-id 12548 :visit-id "01" :proposal-version -1 :trans-version "20120312" :date "02-Apr-2012 16:00:02.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 219664 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12548 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12548 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2923 :al-overhead-at-end 40 :internal-dur-at-end 277 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3445 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([02 After 01 by 14.0 to 140.0 days]) The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. 1333396704686 /var/tmp/OPVisit6486472460084648565.xml STIS observation of GJ 86B. Consists of an acquisition image of GJ 86A, an acquisition peakup on GJ 86B, and spectra in G430L, G750M, and G430M. ORIENT requirements are to place GJ 86 B halfway between the diffraction spikes of A. Will be revised when WFC3 images from Visit 01 are analyzed. Visit is ON HOLD awaiting the WFC3 frames. ORIENT values updated based on recent WFC3 frames 4/2/12 by H. E. Bond. Observation is now ready to be scheduled. (Tic-Visit :proposal-id 12548 :visit-id "02" :proposal-version -1 :trans-version "20120312" :date "02-Apr-2012 15:58:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 258112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12548 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12548 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2921 :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 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12548 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3032 :al-overhead-at-end 75 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 2 0