Intensive Monitoring Survey of Nearby Galaxies (IMSNG) :...
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Introduction Intensive Monitoring Survey of Nearby Galaxies ( IMSNG ) : Constraints on the Progenitor System of a Type Ia Supernova SN 2019ein from its Early Light Curve Gu Lim, Myungshin Im , Dohyeong Kim, Changsu Choi, Gregory S. H Paek , Sophia Kim, Sungyong Hwang, and IMSNG team 2020 SSG Workshop Image Credit: SNU/CEOU
Transcript of Intensive Monitoring Survey of Nearby Galaxies (IMSNG) :...
Introduction Data & reduction Result Progenitor? Summary
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Intensive Monitoring Survey of Nearby Galaxies (IMSNG) : Constraints on the Progenitor System of a Type Ia Supernova
SN 2019ein from its Early Light CurveGu Lim, Myungshin Im, Dohyeong Kim, Changsu Choi, Gregory S. H Paek,
Sophia Kim, Sungyong Hwang, and IMSNG team
2020 SSG Workshop
Image Credit: SNU/CEOU
Introduction Data & reduction Result Progenitor? Summary
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➢ The explosive end in the binary system
➢ Diverse progenitor models
Image Credit: NASA/JPL-Caltech Image Credit: NASA/JPL-Caltech
✓ Observational evidences of the progenitor system are lacking
Gu Lim 2020 SSG Workshop
Type Ia SN
Introduction
SD DD
Introduction Data & reduction Result Progenitor? Summary
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The very early light curve➢ Shock-heated cooling emission can constrain the size of the progenitor system.
(Kasen+10, Rabinak & Waxman 2011)
Gu Lim 2020 SSG Workshop
Introduction
Kasen 2010
𝟕 𝐑⊙
𝟐𝟖𝟓 𝐑⊙
𝟐𝟖. 𝟓 𝐑⊙
WD
Shock
Ejecta
Companion
Thermal X-ray
Cooling : UV/optical
Introduction Data & reduction Result Progenitor? Summary
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IMSNG : Intensive Monitoring Survey of Nearby Galaxies
Maidanak
LOAOMcD
0.8,0.25m McD 2.1m
DOAO SAO SOAO
UKIRT
McDonald 0.25m, 0.8m, 2.1m (US)
SAO 1.0mSOAO 0.6mDOAO 1.0m
(Korea)
Maidanak 1.5m (Uzbekistan)
LSGT 0.43m (SSO, Australia)
LOAO 1m (US)
네이버세계지도IMSNG telescopes
UKIRT 3.9m (Hawaii, US)
CDK14 RASA36
Introduction
➢ 60 UV bright galaxies within d < 50Mpc since 2014
RASA/CDK 0.36m (Chile)(Installation on-going)
LSGT
Introduction Data & reduction Result Progenitor? Summary
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✓ The early light curve was obtained!
2019-04-29.76 2019-05-01.44 2019-05-02.60 2019-05-06.50
1st Detection
NGC5353
SN 2019ein appeared!
▪ BVRI + JHK Imaging
Data
Bias/Dark/Flat processing
Astrometry/Image align
Flux calibration(APASS, PS1)
Image subtraction
Photometry
Reduction
Calibrated
Reference
Subtracted
Data & reduction
Image subtraction
Introduction Data & reduction Result Progenitor? Summary
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Resultm
[A
B]
𝐭𝐦𝐚𝐱− 𝐭 [day]
A typical SN Iabut slightly faint
Long-term light curveΔ𝑚15(𝐵)
[mag]𝐵max
[mag]𝑀𝐵,𝒎𝒂𝒙
[mag]𝜇
[mag]𝐸 𝐵 − 𝑉 ℎ𝑜𝑠𝑡
1.40+/-0.01 14.04+/-0.01 -18.74+/-0.1 32.78+/- 0.09 0.056+/-0.04
𝐸 𝐵 − 𝑉 𝒈𝒂𝒍=0.011 (S & F 2011)
Introduction Data & reduction Result Progenitor? Summary
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Result
✓The size of the system of SN 2019ein < 1.0 𝑹⊙
Black line : Expected cooling
Red line : Expected 56𝑁𝑖 decay
The very early light curve
Data points : Cooling + 56𝑁𝑖 decay emission
1.0 𝐑⊙
0.1 𝐑⊙
ObservedExpected
Introduction Data & reduction Result Progenitor? Summary
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Progenitor?
For SN 2019ein,
Image credit : 한국천문학회
Introduction Data & reduction Result Progenitor? Summary
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Summary
• IMSNG : Early observation of Type Ia SN 2019ein
• A typical SN Ia but slightly faint➢ Shape of light curve
• Weak cooling emission on the early phase ➢ The size of Progenitor < 1.0 𝑅⊙
✓ The progenitor system can be WD-WD or WD-MS
