KMTNet 현황과 계획, 과학연구

김 승 리

한국천문연구원 광학천문본부 변광천체그룹

우주탐사회 워크숍 2015년 1월

2

Development of the KMTNet System

Korea Microlensing Telescope Network

Three Identical Observing Systems

24-hours uninterrupted Monitoring of night sky at Southern Hemisphere

It has been installed at CTIO in Chile, SAAO in South Africa, SSO in Australia.

Budget

Development : ~25.4 Billion KRW

for 6 years from 2009 to 2014

Operation : 2.0 Billion KRW per year

from 2015

Project Overview

Telescope3

Wide Field Optical Telescope

Primary Mirror with 1.6m Diameter

Prime Focus type Reflector

Equatorial Mount

Effective Focal Length of 5160mm

Four Field Corrector Lenses

Delivered Image Quality of 1.0 arcsec FWHM under 0.75 arcsec seeing

Detector4

Large-Format Mosaic CCD camera

Four e2v Chips with 9k by 9k pixels

10x10 microns pixel

0.4 arcsec/pixel, 2x2 square degree

Field Of View (FOV)

High Quantum Efficiency of 80~90%

Cryogenic Cooling System

Filter Changer and Shutter5

Cassette-Style Filter Changer

Four Spectral Filters with 310x310mm square

Johnson-Cousins B,V,R,I and SDSS g,r,i,z filter sets

Bonn-Style Shutter

Sliding Shutter with 325x325mm square

Clear Aperture

6

Telescope Camera FOV Site Target

PanSTARRS 4x1.8m 1400M pixel CCD 7.0 deg2 Haleakala, USA All sky survey

MOA 1.8m 80M pixel CCD 2.4 deg2 Mt. John, New Zealand Galactic Bulge

KMTNet 3x1.6m 340M pixel CCD 4.0 deg2 CTIO – SAAO – SSO Galactic Bulge

SkyMapper 1.35m 268M pixel CCD 5.7 deg2 SSO, Australia All sky survey

OGLE-IV 1.3m 268M pixel CCD 1.4 deg2 LCO, Chile Galactic Bulge

LCOGT 2x2.0m,

10x1.0m, 14x0.6m16M pixel CCD

0.03 deg2

0.2 deg2

Haleakala – Canary –

CTIO – SAAO – SSO

Follow-Up Obs.

Exoplanet, GRB

0

2

4

6

8

10

0 2 4 6 8 10

Wide Field Survey System

KMTNet Sites7

SAAO

SSOCTIO

KASI

KMTNet Sites8

CTIO SAAO

SSO

9

Data Process

Image Process and Photometric Database

Automatic Image Process Pipeline has been developed.

Difference Image Analysis (DIA) will be applied to the Bulge Monitoring Data to search for any variable objects.

Photometric Database for variable objects will be updated in 1~2 days after the observation and be used for light curve modeling.

Raw observation images of 560TB, processed images of 2.24PB, and photometric database of 200TB are expected for 5 years.

10

Installation of the First Telescope at CTIO in Chile

Finished the installation on May, 2014

Test observation for ~4 months using a pre-science 4K CCD camera

Current Status

11

Installation of the Second Telescope at SAAO in South Africa

Finished the installation on July, 2014

Test observation for ~4 months using a pre-science 4K CCD camera

Current Status

12

Installation of the Third Telescope at SSO in Australia

Finished the installation on Nov, 2014

Under the test observation using a pre-science 4K CCD camera

Current Status

13

Development of 18k Mosaic CCD camera

Under the test observation of the first and second cameras at two sites

The third camera is assembling at laboratory in OSU, USA

Current Status

14

Current Status

Test run of galaxies on 20 January, 2015 at CTIO. 120 sec exposure with I filter

FOV ~ 6x6 arcmin2

FWHM~1.0 arcsec

212”

373”

15

Detection of micro-Gravitational Lensing events

Monitoring the Galactic BulgeDiscovery of extra-solar planets

Main Sciences

16

Main Sciences

29%

65%

2% 2% 2% Radial Velocity

Transit

Imaging

Timing

Microlensing

17

Galactic Bulge Season (Red)

Search for Extra-solar Planets, especially, Earth-mass Planets in the Habitable Zone

Survey of Transiting Planets and Variable Stars

Non-Bulge Season (Blue)

Seven observation programs has been selected on 2012 and will be performed for 5 years from 2015

Survey of Supernovae

Survey of Asteroids and Comets especially, Near-Earth Objects

Multiband Photometry of External Galaxies

Others (e.g. Collaboration with Host Countries, Director/Maintenance Time)

Exo-Planets

Variable Stars

Asteroids

Comets

OthersGalaxies

Supernovae

Sciences

18

Development of the System

2015.02: Science run of the first CCD camera at CTIO in Chile

2015.03: Science run of the second CCD camera at SAAO in South Africa

2015.04: Science run of the third CCD camera at SSO in Australia

Short-term Schedule