1. 住 貴宏 （大阪大学） MOA collaboration
MOA-II 1.8m 望遠鏡の現状と将来
1,Galactic Dark Matter (LMC & SMC)
2,Galactic structure (the Bulge)
3,Exoplanets (the Bulge)
4, GRB
5, Guest Obervation
住 貴宏　（大阪大学）
MOA collaboration

2. Gravitational Microlensing
star
100arcsec.
If a lens is a star,
elongation of images is an
order of 100arcsec.
Just see a star magnified
lens
observer
distortion of space due to gravity

3. MOA (since 1995) （Microlensing Observation in Astrophysics） （ New Zealand/Mt. John Observatory, Latitude： 44S, Alt: m ）
1995~1998:MOA-0:0.6m,MOA-cam1(9Mpix)
1999~2005:MOA-I:0.6m,MOA-cam2(24Mpix)
2005~ :MOA-II:1.8m,MOA-cam3(80Mpix)

4. MOA-II1.8m telescope （New Zealand/Mt. John Observatory at NZ, 44S ）
Mirror : 1.8m (F=2.91)
CCD : 8k　x　10k pix. (MOA-cam3)
FOV : 2.2 deg.2
First light： /2005
Survey start：　4/2006

6. MOA-cam3 CCD : 8k x 10k pix. (10 E2V CCD4482)
Pixel size: 0.58 arcsec/pix (15μm)
FOV 　: 2.2 deg.2
Read out　: 32 sec

7. MOA-II filter

8. Observation by MOA 50 deg.2(50Mstars) 1obs./night.(>MJup)
1obs./95min.(Mjup)
1obs./47min. (Mnep)
1obs./15min. (M)
G.C.
600events (2010)

9. Real-time Anomaly check at Mt.John
The planet found
on 11/9/2009
3/4
anomaly

10. 10 events with timescale tE<２days
４７４events in 2 years
M：lens mass
MJ: Jupiter mass
D：distance
vt: velocity
timescale：
~２０days for stars
tE=1.2days
~Jupiter mass
1day

11. Timescale tE distribution
abundance　:~1.8 as common as stars
Mass ： 〜Jupiter mass
Black hole
Neutron star
White dwarf
Main sequence
Brown dwarf
Known objects
474events
Planetary-mass
objects
Sumi et al. 2011, Nature, 473, 7347,

12. Observational time&Operation rate
ゲスト観測３２時間（２０１０−２０１１）
Bulge
Operation rate = observation time / night time　≒ clear time

13. ゲスト観測（松岡氏、名大） UKIDSS 赤外カタログフィールドをMOA-wideRed で観測
5分 x 347 = 32時間　（２０１０−２０１１夏）
High z QSO 探査　ー＞宇宙再電離
L, T型褐色矮星探査
様々な天体の二色図 (Y-J vs. I-Y)。
各赤方偏移にあるクエーサーの放射に対する銀河間空間透過率

14. 将来計画
Option A: カメラアップグレード
Option B: アフリカ、南米に新望遠鏡
WFIRST衛星(2020~)

15. MOA-cam4 plan FOV 7~10 deg.2 Pixel size ~0.5 arcsec/pix 現在
Fully depleted CCD
~256M pixels (32x2kx4kCCD)= 7.04deg2
~320M pixels (40x2kx4kCCD)= 8.8deg2
~384M pixels (48x2kx4kCCD)=10.56deg2 現在
2011 現在 計画
観測効率
CCD読み出し時間
32sec
16sec
1.14倍 (60秒露出時)
量子効率（fully depleted CCD）
長波長感度高い
1.40倍(Red-band)
CCD
(視野)
10枚
(2.2平方度)
32枚
(7.0平方度)
3.20倍 合計
5.10倍
240mm
343mm

16. Cherenkov Telescope Array (CTA)
GRB追観測用光学望遠鏡と連携　
　（ナミビアor アルゼンチン）

17. The WFIRST Microlensing Exoplanet Survey:
Recommended by ASTRO 2010
Decadal report
WFIRST

18. Kepler vs. WFIRST
WFIRST – w/ extended mission
Figures from B. MacIntosh of the ExoPlanet Task Force
Complete the census of planetary systems in the Galaxy

19. WFIRST’s Predicted Discoveries
~2000 FFP！
~190 sub Eath-mass FFP!
(>30 Earth-mass FFP！)
Free-floating rocky planets may
have liquid water, Stevenson (1999)
~3000 exoplanets
~300 sub Earth-mass Planets,
>25 habitable planets
（ MEarh、 AU）
around FGK stars