Building a legacy:The Vera C. Rubin Observatory LSST |
University of Delaware
Department of Physics and Astronomy
federica b. bianco
she/her
Biden School of Public Policy and Administration
Data Science Institute
federica b. bianco
she/her
this slide deck is live at https://slides.com/federicabianco/swift20-bianco
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Building a legacy:The Vera C. Rubin Observatory LSST |
University of Delaware
Department of Physics and Astronomy
Biden School of Public Policy and Administration
Data Science Institute
Rubin Observatory
Site: Cerro Pachon, Chile
Funding: US NSF + DOE
LSST Science Drivers
Probing Dark Energy and Dark Matter
Mapping the Milky Way and Local Volume
Building an unprecedented catalog of Solar System Objects
Exploring the Transient Optical Sky
To accomplish this, we need:
1) a large telescope mirror to be sensitive - 8m (6.7m)
2) a large field-of-view for sky-scanning speed - 10 deg2
3) high spatial resolution, high quality images - 0.2''/pixels
4) process images in realtime and offline to produce live alerts and catalogs of all 37B objects
Objective: to provide a science-ready dataset to transform the 4 key science area
2025
SDSS
LSST-like HSC composite
|
Field of View' Image resolution' DDFs' Standard visit' Photometric precision' Photometric accuracy' Astrometric precision' Astrometric accuracy' |
9.6 sq deg 0.2'' (seeing limited) 5 DDF 30 sec 5 mmag 10 mmag 10 mas 50 mas |
' requirement: ls.st/srd
SDSS 2x4 arcmin sq griz
MYSUC (Gawiser 2014) 1 mag shallower than LSST coadds
| u, g, r, i, z, y | |
|---|---|
|
Photometric filters' saturation limit' # visits* mag single image* mag coadd* Nominal cadence |
u, g, r, i, z, y ~15, 16, 16, 16, 15, 14 53, 70, 185, 192, 168, 165 23.34, 23.2, 24.05, 23.55 22.03 25.4, 26.9, 27.0, 26.5, 25.8, 24.9 2-3 visits per night |
' requirement: ls.st/srd
~800 per field
2 visits per night (within ~30 min for Solar System Science)
~800 visits per field over 10 years
2 visits within ~30 min
~8000 visits in DDFs
The LSST
Science Collaborations
An international community of practice built on principles of cooperation, equity, and solidarity
Rubin LSST Science Collaborations
8 teams
>2000 members
>2500 affiliations
5 continents
Rubin LSST Science Collaborations
Rubin LSST Science Collaborations
Text
Rubin LSST Science Collaborations
Rubin LSST Science Collaborations
PIs:
TVS: R. Street (lead PI) Federica Bianco
SMWLV: W. Clarkson, P. McGee, J. Gizis
SSSC: M. Schamb, D. Trillin
Nurturing the future generations of Rubin scientists with effective, culturally responsive mentoring
Coordinator: Shar Daniels
Participants:
Igor Andreoni, Silvia Piranomonte, Alex Malz
what's in a name?
The first ground-based national US observatory named after a woman, Dr. Vera C. Rubin
Rubin Observatory Status
@fedhere
September 2016
February 2020
May 2022 - Telescope Mount Assembly
The DOE LSST Camera - 3.2 Gigapixel
3024 science raft amplifier channels
Camera and Cryostat integration completed at SLAC in May 2022,
Shutter and filter auto-changer integrated into camera body
LSSTCam undergoing final stages of testing at SLAC
artist (me) impression of the first image taken by ComCam
ls.st/dates
| The First Look press conference is tentatively scheduled for June 17 2025 |
ls.st/dates
| The First Look press conference is tentatively scheduled for June 17 2025 |
late 2024-
early 2025
mid 2025
ls.st/dates
| 04-Jul-2025 |
| 15-Apr-2025 |
| The First Look press conference is tentatively scheduled for June 17 2025 |
late 2024-
early 2025
~6-9 months
alerts build up
ls.st/dates
| The First Look press conference is tentatively scheduled for June 17 2025 |
first data release ~1.5-2y from now
| 15-Apr-2025 |
| The First Look press conference is tentatively scheduled for June 17 2025 |
| The First Look press conference is tentatively scheduled for June 17 2025 |
| 04-Jul-2025 |
LSST
data products
Data Products
data right holders only
world public!
10Million alerts per night!
LSST
+
SWIFT
LSST will provide optical emission for
transients and variable stars such as:
- GRBs
- TDEs
- AGNs
- Blazars
- compact object mergers; kilonovae
- FBOTS (e.g., Drout+14)
- supernova shock break-out
- SN-CSM interaction; shocked material
- SNIa “blue bump” of shocked companion
- recurrent novae & non-terminal explosions
- central engines
multi-cololor 10-year baseline:
precurser time series
detection at scale to r~24
late time persistent observations
LSST survey strategy optimization
Exploring the Transient and Variable Optical Sky
Exploring the Transient and Variable Optical Sky
Exploring the Transient and Variable Optical Sky
Exploring the Transient and Variable Optical Sky
Exploring the Transient and Variable Optical Sky
Exploring the Transient and Variable Optical Sky
LSST Science Book (2009)
Rubin LSST survey design
Rubin has involved the community to an unprecedented level in survey design this is a uniquely "democratic" process!
Survey Cadence Optimization Committee
Rubin LSST survey design
2017
Rubin LSST survey design
Rubin has involved the community to an unprecedented level in survey design this is a uniquely "democratic" process!
2019
Rubin LSST survey design
Rubin has involved the community to an unprecedented level in survey design this is a uniquely "democratic" process!
2023
Rubin LSST survey design
Rubin has involved the community to an unprecedented level in survey design this is a uniquely "democratic" process!
2024
Rubin LSST survey design
Rubin has involved the community to an unprecedented level in survey design this is a uniquely "democratic" process!
2024
2024
LSST ToO program
The main Rubin assets are the 10 sqdeg FoV + rapid slew + depth
PSTN-055 (2022): The SCOC recommends a ToO program be enabled to respond to Gravitational Waves and MMA triggers with a fraction of ≤ 3% of dedicated survey time, with the possibility of extending it to additional types of targets in the future.
Rubin ToO program
+80 authors!
Rubin ToO program
Rubin ToO program
What about fast transients in the main survey?
Rubin LSST survey design
~800 per field
10 seasons, with each 6 months
2 visits per night (within ~30 min for Solar System Science)
revisit time => 4.5 nights
This will scatter significantly (weather, moon, ...)
The original survey plan didn't lead to good time domain astronomy (TDA) outcomes:
multi-cololor 10-year baseline:
precurser time series
detection at scale to r~24
late time persistent observations
Rubin LSST survey design
Text
The original survey plan didn't lead to good time domain astronomy (TDA) outcomes:
~800 per field
10 seasons, with each 6 months
2 visits per night (within ~30 min for Solar System Science)
revisit time => 4.5 nights
This will scatter significantly (weather, moon, ...)
Introducing Rolling Cadence
Current plan: rolling 8 out of the 10 years
Rubin LSST survey design up to 2018
# pairs of observations (1e5)
time gaps (days)
based on 2017 LSST simulations
2017 simulations: between 3 and 32 KN can be identified (~300 detected)
Text
Proposed 3 intranight obs
2 within 1 hour in different filters
1 at 4-8 hours separation w repeat filter
Intorducing Triplets
Intranight color (near instantaneous)
Intranight rate of change (~hour time scales)
Current plan: rolling 8 out of the 10 years
Presto-Color, Bianco+ 2019
Proposed 3 intranight obs
2 within 1 hour in different filters
1 at 4-8 hours separation w repeat filter
Text
Intranight color (near instantaneous)
Intranight rate of change (~hour time scales)
Ofek+ 2024
Intorducing Triplets
Proposed 3 intranight obs
2 within 1 hour in different filters
1 at 4-8 hours separation w repeat filter
Intorducing Triplets
Current plan: 4% of the survey is currently conducted in triplets
Intranight color (near instantaneous)
Intranight rate of change (~hour time scales)
Ofek+ 2024
newer simulations ->
<-bad good ->
2023 simulations: 62% improvement
newer simulations ->
4 – 24 hour gaps between epochs will enable kilonova parameter estimation
Kilonovae in LSST Wide Fast Deep
Andreoni+ 2022a
2023 simulations: 62% improvement
newer simulations ->
4 – 24 hour gaps between epochs will enable kilonova parameter estimation
Kilonovae in LSST Wide Fast Deep
Andreoni+ 2022a
Text
2023 simulations: 62% improvement
newer simulations ->
4 – 24 hour gaps between epochs will enable kilonova parameter estimation
Kilonovae in LSST Wide Fast Deep
Andreoni+ 2022a
https://pstn-056.lsst.io/
Proposed reduction to 6 rolling years (3 2-year cycles) to improve intrasurvey uniformity
8y rolling
no rolling
6y rolling
~7% loss in KN characterization
Proposed reduction to 6 rolling years (3 2-year cycles) to improve intrasurvey uniformity
https://pstn-056.lsst.io/
https://pstn-056.lsst.io/
Shar Daniels
NSF Graduate Student Fellow
University of Delaware
TVS Science Collaboration
Fast Transient Subgroup
join TVS! no fees no minimum req
Chairs:
Igor Andreoni + Sara Bonito
TVS Science Collaboration
Fast Transient Subgroup
This is urgent! results must come through in the next ~ 2 months or the strategy may be set for year 1
Shar Daniels
NSF Graduate Student Fellow
University of Delaware
thank you!
University of Delaware
Department of Physics and Astronomy
Biden School of Public Policy and Administration
Data Science Institute
federica bianco
fbianco@udel.edu
https://slides.com/federicabianco/swift20-bianco
