Tohoku University

Takashi Ichikawa

Current status of Dome Fuji

and

2.5m Antarctic Infrared Telescope

It is not funded yet, but

Good news

Excellent seeing (0.2”) and thin boundary layer (~15m)

(Okita’s talk)

Strong support from astronomy community in Japan

Science Council of Japan* has nominated “Antarctic

Astronomy” in “Master Plan of Large Research Projects”

(~200 natural and social science programs. 8 from

astronomy)

Budget request in 2014 for the telescopes

*the representative organization of Japanese scientist community ranging over all fields of sciences

subsuming humanities, social sciences, life sciences, natural sciences, and engineering

Bad news

Delay in the scientific and logistics programs of the

Japanese Antarctic Research Expedition due to bad ice

condition around Syowa Station

Very thick ice hampered the

icebreaker from unloading freight

for two years.

Shirase anchored at ~23km away from Syowa station (2012)

In 2013/2014 program, the number

of wintering members will be

reduced.

Probable delay in astronomy program

2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

NIP

R

8th 9th 10th

Contraction of winterover station（plan）

overwinter

construction test transport Transport

& assemble

operation

Schedule

We cancelled small infrared and THz telescopes

2.5

m

40cm

Dome Fuji Station in Jan, 2013

PLATO-F (UNSW)

since Jan. 2011

The National Institute of Polar Research Syowa

Dome F (3810m)

PLATO-F (UNSW) in Jan. 2011

But, circuit breaker was down in early July

ＳＮＯＤＡＲ

ＴｗｉｎＣＡＭ

１０ｃｍｘ２ telescopes １６ｍ pole

temperature

(Bonner et al.)

exoplanets

Retired in July, 2011

after operation for 6 months

due to no time for maintenance on

2012/2013 expedition

Aurora cameras

2012/2013 expedition team

• Retrieved data

• Repaired PLATO-F

• Installed Aurora cameras

No in-equal subsidence has been observed

0 25 50 75 100 125

-0.010

-0.005

0.000

0.005

0.010

raw data

calibrated

0.025

An

gle

(d

eg

ree

)

Ou

tpu

t (m

V)

Days

0

Observations will be resumed in next summer.

Basic data for the telescope tower

foundation 9m tower clinometer

Constructed 9m-high stage

2.5m Infrared Telescope Ultra-lightwieght telescope mount (Kurita+2009)

Styrene foam enclosure

with ventilation

New technology of telescope mount

Kurita+ (2009)

Light weight

Easy to assemble

Okayama 3.8m telescope

Snow-wind tunnel test

snow drift

Kim+ 2012

Snow drift Vibration analysis

For safe transportation of 2.5m mirror

Kagawa+ 2013

First generation instruments

Mid-infrared heterodyne spectrograph

7~13μm

R~107-8

Bandwidth 1GHz

Nakagawa+ 2012

Atmosphere of solar planets in vicinity to Sun

mixing ratio, velocity, pressure, excitation condition,

temperature, and the vertical information of H2O, CO2,

O3, CO, HO2, ...

• Cold atmosphere: dark infrared sky (50 – 100 times darker)

• The free-atmosphere seeing 0.2”, the best in the world

• Dry atmosphere

• Stable transmittance

• Observations for long periods uninterrupted for months

Good Reasons

Dome-F (winter 25%)

H2

Red-shifted H2

Develop of 17μm laser for H2 observations

17μm H2 28μm H2

(fast detector is a main issue)

Three-Color Infrared Camera (1~5μm)

ORION 2Kx2K x 3

Proto model

2Kx2K VIRGO (1~2.5μm)

256x256x2 InSb (2.5~5μm)

Under assembling

Technology of MOIRCS for 8.2m Subaru

Multi-object Infrared Camera and Spectrograph

simple multi-slit spectrograph

~10 reference stars in large slits

Slit mask of MOSFIRE

McLean+ 2010

J

K

1~5μm

Simultaneous two colors and Sp

R~100

• Cold atmosphere: dark infrared sky (50 – 100 times darker)

• The free-atmosphere seeing 0.2”, the best in the world

• Dry atmosphere: 0.14mmPWV (~10 times lower) in winter

• Stable transmittance

• Long periods of uninterrupted darkness for months

Good Reasons

Point sources with

1 hour integration

S/N=5

Subaru

AIRT

Comparison of Sensitivities with Subaru

diffraction limit

0.12” 0.24”

Unique opportunity for deep, high photometric and spatial precision astronomy

High sensitivity of Subaru telescope

High quality of HST

z=1

THz (200μm) and near-infrared

wide area survey at z>3 z=3

7.7 Gyr

11.3 Gyr

Most active star-forming

era in history

Hershel galaxy at z=6.5

Confusion limit

1 hour integration

Dusty Star Burst Galaxies

Riechers+ 2013

10m THz telescope

2.4μm, S/N=5 (1 hour)

AIRT

SPICA ALMA

STR, stellar mass, morphology, merging

SSA22 (z~3) (Uchimoto+2012)

100Mpcx100Mpc

• quiescent and SF galaxies

• dusty galaxies

• Low mass galaxies (~109Msun)

• Morphology

AzTEC1

Proto-Quasar?

Tamura+ 2010

e.g., Near-infrared and sub-mm observations in SSA22 at z~3

Widest and Deepest High-Redshift Galaxy Survey in K band

FIRES

MODS

MODS

VLT GOODS-S

SDF

(KA

B, 5σ)

MUSYC 4m telescope

8m telescope

(KA

B, 5σ)

Survey area (arcmin2)

De

pth

Our Goal

Subaru+MOIRCS

UKIDSS

VISTA

Complete samples of 109 Msun at z~3

• Cold atmosphere: dark infrared sky (50 – 100 times darker)

• The free-atmosphere seeing 0.2”, the best in the world

• Dry atmosphere: 0.14mmPWV (~10 times lower) in winter

• Stable transmittance

• Long periods of uninterrupted darkness for months

Good Reasons

water-dominated atmosphere on Super-Earths

SPITZER

HST

many molecular lines (H2O,CO2,CH4…)

λ/Δλ~100

Transit and secondary eclipse

Transit observations with low resolution spectrograph with multi-slits

GJ 1214b

• Cold atmosphere: dark infrared sky (50 – 100 times darker)

• The free-atmosphere seeing 0.2”, the best in the world

• Dry atmosphere: 0.14mmPWV (~10 times lower) in winter

• Stable transparency

• Long periods of uninterrupted darkness for months

Good Reasons

Hot Jupiter

Continuous observations of multiple systems

Super earth

Variety of ex-planet systems

TESS (2017）

Ｂｒｉｇｈｔ G、K、M ｔｙｐｅ ｓｔａｒｓ

50cm Schmidt x3

Candidates of multiple systems

CCD camera at Dome-F

Collaboration with Dome A

Thank you