Confirming the transit of the Earth-mass planet orbiting Alpha Centauri B

Cut 1 iteration from exposure 6 in visit 05 to allow for scheduling. -1829908081 ----- Attempting Submission 1 (Sun Jul 13 15:42:55 GMT 2014) ----- ----- Attempting Submission 2 (Mon Jul 14 17:13:32 GMT 2014) ----- ----- Attempting Submission 3 (Mon Jul 14 19:30:58 GMT 2014) ----- HST Phase II Proposal 13927 (13927_30.apt) successfully submitted. ----- Attempting Submission 4 (Tue Jul 15 15:23:09 GMT 2014) ----- ----- Attempting Submission 5 (Tue Jul 15 18:01:30 GMT 2014) ----- ----- Attempting Submission 6 (Tue Jul 15 21:43:16 GMT 2014) ----- HST Phase II Proposal 13927 (13927_CVZ.apt) successfully submitted. ----- Attempting Submission 7 (Wed Jul 16 00:45:03 GMT 2014) ----- ----- Attempting Submission 8 (Thu Jul 17 21:29:38 GMT 2014) ----- Program will be processed in-house Confirming the transit of the Earth-mass planet orbiting Alpha Centauri B One of the most fascinating exoplanet findings of the past years is undoubtedly the discovery of an Earth-mass exoplanet orbiting Alpha Centauri B. Alpha Cen Bb orbits one component of the closest stellar system to the Earth and has the potential to become a true Rosetta stone in exoplanet science, if its transiting nature were revealed. In 2013, we observed Alpha Centauri B during 16 orbits with HST/STIS to search for the transit of Alpha Cen Bb. We recently carried out in-depth photometric analyses of this dataset that resulted in the clear detection of a transit-shaped pattern. Several factors, however, prevent us from securing the planetary nature of the signal found in the STIS time-series. Now that we know where and when to look for, we propose to confirm the repeatability of this signal and to firmly establish Alpha Cen Bb's existence and tighten its physical and orbital properties. We base our observing strategy on the successful approach employed just one year ago with the same instrument. Until Aug 9th 2014, combination of HST available roll angles, Alpha Cen binary separation and position angle will match the nearly-ideal configuration we had in July 2013. It would even be possible to benefit from CVZ status from 24/7/2014 to 28/7/2014, in which one transit of Alpha Centauri Bb is expected. HST/STIS is the only facility able to confirm a transit from such a small planet at a high confidence level. This is a follow-up of PID13180 targetting Alpha Cen B. The exact same observing strategy is applied. The chosen ORIENT allows us to exclude the brighter Alpha Cen A by placing the slit close to the normal of the binary separation vector. Considering a binary position angle of 282.1 degrees, this translates to an ORIENT of 57 degrees. The next possible window starting from July 14th to August 8th allows ORIENT of ~75 degrees, which is acceptable from our program. We propose to do the acquisition of Alpha Cen B in the same way as for programs #12374, 12758, 13060 and 13180 where an ACQ exposure is first performed on Alpha Cen A before shifting the pointing to Alpha Cen B, which is defined here as an offset target. ACQ and ACQ/PEAK exposures are then performed on Alpha Cen B, using the narrowest long slit (52"x0.05") in order to obtain the best possible centering of the star in the largest slit (52"x2") that will be used for the science exposures. This choice is made to minimize slit losses while hiding Alpha Cen A (which is also why the telescope roll angle matters). For the science exposures, we will use STIS/CCD with G750M (i6094 setting) and an exposure time of 6s with GAIN=4. Alpha Cen B will be saturated with the bleeding extending over ~ +/-30 pixels from the spectral trace (and would not reach the diffraction spikes from Alpha Cen A for the selected roll angle). EXTRA-SOLAR PLANETS Default false false false false false AVAILABLE STAR G V-IV Target coordinates from PID 13465 (PI T. Ayres) HD128620 HR-5459 J2000 STAR K V-IV Offsets of B from A resulting from the revised ephemeris of T. Ayres and valid for the mid-July / mid-August period. HD128621 HR5460 STIS/CCD Spectroscopic No No G750M 6094 1405257029774 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. 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This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. 1405365976432 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. Preferred ORIENT is 75, but opening up the range to check on guide stars and other windows not available at 75 degrees. 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This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. 1405437308578 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. Preferred ORIENT is 75, but opening up the range to check on guide stars and other windows not available at 75 degrees. 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This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. 1405446670101 Preferred ORIENT is 75, but opening up the range to check on guide stars and other windows not available at 75 degrees. 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This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. 1405471296739 Preferred ORIENT is 75, but opening up the range to check on guide stars and other windows not available at 75 degrees. (Tic-Visit :proposal-id 13927 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "15-Jul-2014 20:41:05.0" :trans-errors '(:WARNINGS 10 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 9 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 5678224 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13927 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13927 :visit-id "05" :obset-id "A5" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13927 :visit-id "05" :obset-id "B5" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13927 :visit-id "05" :obset-id "C5" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 4401 :al-overhead-at-end 0 :internal-dur-at-end 135 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 4593 :al-overhead-at-end 0 :internal-dur-at-end 391 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 3 :pcs-time 222 :si-vis-utilization 5410 :al-overhead-at-end 0 :internal-dur-at-end 67 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 4 :pcs-time 222 :si-vis-utilization 5255 :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 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 5 :pcs-time 0 :si-vis-utilization 5579 :al-overhead-at-end 120 :internal-dur-at-end 29 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 6 :pcs-time 222 :si-vis-utilization 4638 :al-overhead-at-end 120 :internal-dur-at-end 149 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 7 :pcs-time 222 :si-vis-utilization 4478 :al-overhead-at-end 123 :internal-dur-at-end 383 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 8 :pcs-time 222 :si-vis-utilization 4424 :al-overhead-at-end 120 :internal-dur-at-end 92 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13927 :visit-id "05" :orbit-number 9 :pcs-time 222 :si-vis-utilization 4158 :al-overhead-at-end 123 :internal-dur-at-end 326 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3494 :pcs-gap 0 ) false 9 9 Setting GAIN=4, which needs to be done within the AVAILABLE mode, is required to avoid saturation for this acquisition. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures. This exposure is saturated on purpose. We also require "WAVECAL=NO" for these exposures.