Updated strategy of 16785 to include more angular coverage per orbit
Changed sign of y postarg in PSF_TWHYA_BAR5_MINUS1975107564----- Attempting Submission 1 (Mon Jul 19 17:59:30 GMT 2021) -----
----- Attempting Submission 2 (Tue Oct 12 16:57:15 GMT 2021) -----
----- Attempting Submission 3 (Tue Jan 31 17:49:20 GMT 2023) -----A Multi-Cycle Monitoring Program of the Hydra's ShadowIn the era of HST, JWST, and ALMA, the initial conditions of planet formation will be laid bare through the direct imaging of planet forming regions around nearby young stars. As more and more disks are observed over multiple epochs, their dynamic and variable natures are revealed, opening new avenues of study. Archival HST images of TW Hya's outer disk show that it has a shadow that orbits with a period of ~16 yr, but the full orbit of the shadow has not been observed, leaving ambiguity about its origin. We propose to observe TW Hya over the next three Cycles with HST/STIS coronagraphy to fill in badly needed orbital phase coverage of the shadow's motion and create a homogenous, high quality dataset with archival STIS observations. Our program will elucidate the physical origin of the shadow and constrain the structure of TW Hya's inner cavity independently from sub-mm imaging. Disk shadow imaging is a new tool for understanding the initial conditions of planet formation at radii inaccessible by other observations.This proposal is replicated from 16228, which observed TW Hya in 2021 with a combination of BAR5 and WEDGEA1.0 50CORON aperture positions. In this program we observe TW HYA in 3 visits interleaved with one visit of the PSF star. The first and last visit of TW Hya is oriented off nominal of between +/-15 to +/-30 degrees to enhance angular coverage of the protoplanetary disk. We seek to have this visit scheduled at some point during Cycle 29 so as to cover new phases of the shadow's behavior.The team for this proposal is composed of several STIS and NICMOS experts in high contrast imaging (John Debes, STIS Team Lead and previous PI of 13753 a STIS program on TW Hya; Alycia Weinberger, previous PI of several NICMOS and STIS disk proposals; and Laurent Pueyo, member of the ALICE reprocessing team and expert in post-processing techniques. Dean Hines was a member of the NICMOS IDT and is an expert in polarimetry, along with Schuyler Wolff. Joel Kastner is an expert in young stars.
We also have several theoretical experts to interpret the data including Hannah Jang-Condell, Rebecca Nealon, and Richard Alexander. Peter Plavchan is the lead of radial velocity monitoring of TW Hya and is a science team member of iShell.Exoplanets and Exoplanet Formation6falsefalsefalsefalsefalsefalsefalsefalseSUPPORTEDSTART TAURI STARNOJ2000J2000STARM V-IVNOpossible spoiler star from original 2000 program is now at ~5.73" in 2021.J2000J2000STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0STIS/CCDImagingYesNoBAR5STIS/CCDImagingYesNoWEDGEA1.0Timing link suitability includes constraints ([02 After 01 by 0.0 to 0.1 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.TW Hya
First of two sets of visits, each containing three visits of TW Hya at different relative orientations with one PSF calibration observation interleaved.
This is the first TW Hya visit in the first set.
The four visits within each set must be executed sequentally in contiguous orbits interrupted only for Earth occultation.
Orientation: We wish to schedule this visit (1) at -30 deg from Visit 2, with the absolute orientation of Visit 2 unconstrained.
We allow a relative orientation tolerence from -15 deg to -30 deg to assist in guide star selection and scheduling.
NOTE to PC: Schedule as close to -30 deg from Visit 2 as possible.
Relative Timing: This visit (1) should immediately preceed visit (2). I.e., They should be executed sequentially in "back-to-back" orbits.
BAR5 exposure times are selected to maximize SNR close to the star (~10-15/pixel up to inner working angle) and WEDGEA1.0 are selected to be as long as possible to ensure depth exterior to 1".1678440848000352.82070999999996(Tic-Visit
:proposal-id 16785
:visit-id "01"
:proposal-version -1
:trans-version "20210514"
:date "01-Oct-2021 09:00:20.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 29712
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16785
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16785
:visit-id "01"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2544
:al-overhead-at-end 0
:internal-dur-at-end 332
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2927
:pcs-gap 0
)true10Timing link suitability includes constraints ([02 After 01 by 0.0 to 0.1 days] [03 After 02 by 0.0 to 0.1 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.TW Hya
three visits of TW HYA at different relative orientations with one PSF calibration observation interleaved.
This is the second TW Hya visit in the first set.
The four visits within the set must be executed sequentally in contiguous orbits interrupted only for Earth occultation.
Orientation: There are no orientation constraints on this visit (2).
This visit at nominal roll as scheduled by STScI.
Visits 1, 3, 4 carry relative orientation constraints w.r.t. this visit.
Relative Timing: This visit (2) should immediately follow Visit 1 and immediately preceed Visit 3 in back-to-back orbits.16784465560007.820709999999991(Tic-Visit
:proposal-id 16785
:visit-id "02"
:proposal-version -1
:trans-version "20210514"
:date "01-Oct-2021 09:02:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 29712
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16785
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16785
:visit-id "02"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2544
:al-overhead-at-end 0
:internal-dur-at-end 332
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2927
:pcs-gap 0
)true10Timing link suitability includes constraints ([03 After 02 by 0.0 to 0.1 days] [04 After 03 by 0.0 to 0.1 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.PSF (HD 85512). PSF calibration target for TW Hya. V = 7.636. B - V = +1.15. Spex. K6Vk
This is the PSF star calibrator for the flanking visits (1-4). We levy no orientation constraints on this visit (3). However, we choose this target since it has been used in the past for TW Hya. So as Visits 2 and 3 must be scheduled in sequential contiguous orbits, if scheduled at nominal roll (as we expect also Visit 2 will be) then we expect absolute orientations of Visits 2 and 3 to be very similar (within a few degrees). This is important so we maintain similar Sun and Beta angles for the science target and its PSF calibrator,
Relative Timing: This visit (3) should immediately follow visit 2 and immediately precede visit 4. I.e., they should be executed sequentially in "back-to-back" orbits.167845199800029.00353284456361(Tic-Visit
:proposal-id 16785
:visit-id "03"
:proposal-version -1
:trans-version "20220630"
:date "31-Jan-2023 12:47:51.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 165440
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16785
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16785
:visit-id "03"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2496
:al-overhead-at-end 0
:internal-dur-at-end 329
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2929
:pcs-gap 0
)true10K6V nearby star V=7.65
Exptime rounded to nearest 0.1 second, assumed to get SNR=100.Timing link suitability includes constraints ([04 After 03 by 0.0 to 0.1 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.Orientation: We wish to schedule this visit (4) at +30 deg from Visit 2, with the absolute orientation of Visit 2 unconstrained.
We allow a relative orientation tolerence from +15 deg to +30 deg to assist in guide star selection and scheduling.
NOTE to PC: Schedule as close to +30 deg from Visit 2 as possible.
Relative Timing: This visit (4) should immediately follow Visit 3. I.e., They should be executed sequentially in "back-to-back" orbits.167845797100022.82070999999999(Tic-Visit
:proposal-id 16785
:visit-id "04"
:proposal-version -1
:trans-version "20220630"
:date "31-Jan-2023 12:47:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 29712
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16785
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16785
:visit-id "04"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2544
:al-overhead-at-end 0
:internal-dur-at-end 332
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2927
:pcs-gap 0
)true10