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Outline
- Introduction of kilonovae
- Kilonovae search
- Survey simulations
- Serendipitous observations
Detectability of Kilonovae with Zwicky Transient Facility Detection - - PowerPoint PPT Presentation
Detectability of Kilonovae with Zwicky Transient Facility Detection - - PowerPoint PPT Presentation
Detectability of Kilonovae with Zwicky Transient Facility Detection and follow-up of Kilonovae with the Zwicky Transient Facility Ana Sagus Carracedo Astronomdagarna 2019 Ana Sagus Carracedo PhD student at Stockholm University Compact
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Image: NASA
Gravitational wave signal Electromagnetic counterpart
Metzger et al. 2012
Short GRB Kilonova
Virgo Collaboration
Binary neutron star merger (BNS)
Introduction
Introduction
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GW170817
- Nearby, only 40 Mpc
- Very well localised
- Short GRB
- UV/optical/infrared
kilonova
4
Kasliwal et al. 2017
- B. P. Abbott et al.
AT2017gfo
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Kilonovae search
Observational challenges
- Fast-evolving transient
- Relatively faint (Mabs ~-16)
- Viewing angle dependence
- Rare objects
- Only one event
Iair Arcavi et al. 2017
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Kilonovae search
Observational challenges How can we find them?
- LIGO/Virgo public alerts
- Dedicated surveys
Iair Arcavi et al. 2017
- Fast-evolving transient
- Relatively faint (Mabs ~-16)
- Viewing angle dependence
- Rare objects
- Only one event
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S190910h S190814bv
Extremely bad! Extremely good!
50% area: 8040 deg2 90% area: 24264 deg2 50% area: 5 deg2 90% area: 23 deg2
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https://gracedb.ligo.org/superevents/public/O3/
LIGO/Virgo public alerts
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8
Samuel Oschin/P48 Telescope exterior
ZTF Zwicky Transient Facility
Filters: g, r and i
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Survey simulations
Simsurvey: Python package for simulating the lightcurves obtained by an astronomical transient survey
Survey plan Kilonova model Detection criteria Inputs Output Observed lightcurves that pass the detection criteria
https://simsurvey.readthedocs.io/en/latest/
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Survey simulations
Simsurvey: Python package for simulating the lightcurves obtained by an astronomical transient survey
Survey plan Kilonova model Detection criteria Inputs Output Observed lightcurves that pass the detection criteria
https://simsurvey.readthedocs.io/en/latest/
In this work:
- Optimistic survey: g r and i, twice per night,
same depth
- Viewing angle distribution
- Detection criteria: 2 detections with S/N >= 5
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Viewing angle dependence
Pole
Equator Bulla et al. 2019
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Pole Equator
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Pole Equator
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Pole Equator
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Pole Equator
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Pole Equator
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Pole Equator
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Pole Equator
gr
Limiting magnitude = 20.5
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Pole Equator
gr gri
Limiting magnitude = 20.5
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Pole Equator
gr gri
Limiting magnitude = 22 !! Distance x2 Volume x8
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Detection criteria : 2 detections S/N>5 in at least two filter. Non-detection within 20 days before and after. Time-period with S/N > 5 less than 25 days
Serendipitous observations of Kilonovae with the ZTF
Preliminary results
Comparing with SNe rates (Gpc-3 yr-1) SN Ia ~30000 SN Ibc ~22500 SN IIn ~7500 SN IIp ~120000
20 months of ZTF data
- No kilonova detection
Kilonova rate < 4545 Gpc-3 yr-1 Work in progress…
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- Dedicated observations required to improve
detection probability.
- We present a tool that allow us to understand
detections and non-detections, optimize the
- bserving strategy and estimate rates