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Assigned ID: 5236
----- Attempting Submission 1 (Mon Mar 25 20:00:15 GMT 2024) -----
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----- Attempting Submission 1 (Mon Aug 12 13:14:54 GMT 2024) -----
HST Phase II Proposal 17824 successfully submitted.
Receipt: # 17824-1
----- Attempting Submission 2 (Thu Sep 26 08:54:37 GMT 2024) -----
----- Attempting Submission 4 (Tue Oct 01 14:01:31 GMT 2024) -----
----- Attempting Submission 5 (Sat Mar 28 13:59:54 GMT 2026) -----
Warnings are from the already completed/failed visits
Examining the metal diverse interior composition of thick disk and halo planets using polluted white dwarfs
Exoplanets are incredibly diverse objects and many are unlike anything we have in the Solar System, including hot-Jupiters, super-Earths and sub-Neptunes. The formation of these bodies depends on material available in the proto-planetary disk. Compositionally-different stars can therefore give rise to compositionally-different exoplanets.
Thick disk and halo stars are metal-poor and alpha-enhanced and initial findings corroborate their exoplanets share the host star composition. However, observations of main sequence stars can only give densities and compositions are inferred using models, leading to large degeneracies.
If an object is accreted onto a white dwarf, their pure hydrogen or helium atmospheres becomes polluted. This allows us to directly measure the composition of the accreted body using spectroscopic observations. This method had been incredibly sucessful when applied to thin disk stars and can reveal much more information about the interiors of exoplanets compared to only density,
We propose targeting thick disk and halo polluted white dwarfs to investigate the chemical composition of exoplanets orbiting thick disk and halo stars. This study will probe their interiors using a method never applied to thick disk and halo exoplanets. We will be able to uncover the effects that galactic chemical evolution and galactic location have on what kind of exoplanets form.
These HST observations will obtain COS/G130M FUV spectroscopy of eight hydrogen-dominated white dwarfs, which are located in the thick disk or halo, revealed by kinematic analysis.
We use exposure times such that we aim for S/N = 30 at 1310A, with a central wavelength of 1291A and exposure times split equally across FP-POS 3 and 4. For targets with 4 or more orbits, we also observe with a central wavelength of 1222A with FP-POS 1,2,3,4 for more blue coverage.
The ETC simulations are carried out using spectra generated from models for Teff and logg of the white dwarfs from the the Gentile-Fusillo (2021) white dwarf catalogue from Gaia DR3.
Jamie Williams is a PhD candidate studying COS observations of white dwarfs accreting rocky debris, and he will
lead the analysis of the data from this program.
Thomas Wilson is an expert in transitting exoplanets and the analysis of their interiors. His knowledge will be used to interept the abundances of polluted white dwarfs.
Boris Gaensicke is an expert in all aspects of polluted white dwarfs and their study using COS. He will oversee the implementation of the observations, as well as the data analysis and modelling.
Exoplanets and Exoplanet Formation
6
false
false
false
false
false
false
false
SUPPORTED
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
Teff = 26623
No objects in Gaia around 8 arcseconds
GALEX-J010852.7+165838
J2000
J2000
STAR
DA
NO
Teff = 20020
No objects in Gaia around 8 arcseconds
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
Teff = 25022
No objects in Gaia around 8 arcseconds
G-159-31
J2000
J2000
STAR
DA
NO
Teff = 20729
No objects in Gaia around 8 arcseconds
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
Teff = 18542
No objects in Gaia around 8 arcseconds
TON-558
J2000
J2000
STAR
DA
NO
Teff = 22495
No objects in Gaia around 8 arcseconds
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
Teff = 19846
No objects in Gaia around 8 arcseconds
GALEX-J162532.8+273356
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
Teff = 39557
No objects in Gaia around 8 arcseconds
GALEX-J225513.6+230944
J2000
J2000
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
COS/FUV
Spectroscopic
No
No
G130M
1291
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit469458095958912090.xml
1750114588000
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true
1
1
Total S/N = 32
Total S/N = 32
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
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Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
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true
3
3
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit2662405518213316496.xml
1729772077000
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:visit-id "04"
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:data-volume 365408
:tdrss-contact-duration 0
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(Tic-Obset
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:visit-id "04"
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:si-vis-utilization 2615
:al-overhead-at-end 0
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:low-sky "N"
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true
1
1
Total S/N = 33
Total S/N = 33
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit13252626137716733912.xml
1758800313000
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:si-vis-utilization 2660
:al-overhead-at-end 0
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:al-overhead-at-end 0
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:low-sky "N"
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true
5
5
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit15075774007103833449.xml
1769121193000
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:trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0
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:data-volume 435040
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true
4
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Total S/N = 33
Total S/N = 33
Total S/N = 33
Total S/N = 33
Total S/N = 33
Total S/N = 33
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
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true
4
4
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\OneDrive\Documents\OP-cache\17824phase2_failedvisits-v11.xml
Full repeat of visit 07 (four orbits).
(Tic-Visit
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true
4
0
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
Total S/N = 31
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit2224880890037247253.xml
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:date "28-Mar-2026 13:59:14.0"
:trans-errors '(:WARNINGS 3 :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 522048
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17824
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17824
:visit-id "08"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2651
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 17824
:visit-id "08"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2651
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 17824
:visit-id "08"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2652
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
true
3
3
Total S/N = 30
Total S/N = 30
Total S/N = 30
Total S/N = 30
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\OneDrive\Documents\OP-cache\17824phase2_failedvisits-v12.xml
Repeat of first orbit of visit 08.
(Tic-Visit
:proposal-id 17824
:visit-id "12"
:proposal-version -1
:trans-version "20250929"
:date "28-Mar-2026 13:47:29.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 174016
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17824
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17824
:visit-id "12"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2603
:al-overhead-at-end 0
:internal-dur-at-end 424
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
true
1
0
Total S/N = 30
Total S/N = 30
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit6572201968953460542.xml
1751274324000
238.07940523911714
(Tic-Visit
:proposal-id 17824
:visit-id "09"
:proposal-version -1
:trans-version "20250929"
:date "28-Mar-2026 13:59:15.0"
:trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 348032
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17824
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17824
:visit-id "09"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2647
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 17824
:visit-id "09"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2648
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
2
2
Total S/N =30
Total S/N =30
The scheduling data was generated by CASM 34.0.
CASM was run in Phase II mode.
C:\Users\jamie\AppData\Local\Temp\OPVisit17726574616662363123.xml
1754426857000
243.95528420245114
(Tic-Visit
:proposal-id 17824
:visit-id "10"
:proposal-version -1
:trans-version "20250929"
:date "28-Mar-2026 13:59:15.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 382784
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17824
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17824
:visit-id "10"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2634
:al-overhead-at-end 0
:internal-dur-at-end 367
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)
true
1
1
Total S/N = 32
Total S/N = 32