THE STAR FORMATIONNEWSLETTER#319 (2-11)
泉奈都子（茨城大学）

1. Revealing the chemical structure of the Class I disc Oph-IRS 67
2. The Effect of Binarity on Circumstellar Disk Evolution
3. Variability of young stellar objects in the star-forming region PelicanNebula
4. The complex chemistry of hot cores n Sagittarius B2(N): Influence ofcosmic-ray ionization and thermal history
5. GC Tau A: Dark shadows on the ring world
6. Sub-arcsecond (sub)millimeter imaging of the massive protocluster
G358.93-0.03: Discovery of 14 new methanol maser linesassociated with a hot core
7. Modeling C-Shock Chemiestory in Isolated Molecular Outflows
8. Molecular complexity on disk-scale uncovered by ALMA: The
chemical composition of the high-mass protostar AFGL 4176
9. Upper limits on the water vapour content of the β Pictoris debris disk
10.Silicate features in the circumstellar envelopes of the Class I binary
driving source of HH 250

2. Revealing the chemical structures of the Class I disc Oph-IRS 67
E. Artur de la Villarmois et al. Accepted by A&A http://arxiv.org/pdf/1906.00685
Line-rich Class I protobinary source, OPh-IRS 67の構造を調べ、Class 0, Class IIsourceとの違いを調べる67• Oph-IRS
Outflow structure (> 1000 AU) に付随- 付随しているKeplerian circumbinary discが ~620AUまで広がっている- 他のClass I sourceと比べてrich chemistry, 明るいc-C3H2 (PDRに付随する)が検出されている• Observation
SMA, typical beam size: 1”.7 × 1”.4 (~260 × 210 AU), maximum angular scale: ~25”-

• ResultsContinuum-‣ Dust opacity spectral index (β): β=0.8±0.3, これはISMの典型的な値 (β ~1.7)より小さい→ grain growth or optically thick dust emission- Molecular transition‣ 主に3つの領域をトレース: 1) DCO+ - cold region, 2) CO isotopologues,
CS, SO - Disk, 3) CN, DCN, carbon-chain molecules - PDR• Results
Molecular transition-‣ 主に3つの領域をトレース: 1) DCO+ - cold region, 2) CO isotopologues,CS, SO - Disk, 3) CN, DCN, carbon-chain molecules - PDR• Results
H CO- 2‣ Circumbinary disk, PDR 両方をトレース‣ Temperature mapはphysical structureとconsistent: 1) warm gas - outflowの方向に沿っている、2) lukewarm gas - PDR, 3) colder gas - disk

- Class 0, Class IIとの比較‣ Class 0との類似: Sulphur-bearing species(CS, SO), Carbon-chain molecule‣ Class IIとの類似: PDR tracer (CN)
→ 2つのステージの中間を示している

6. GG Tau A: Dark shadows on the ringworld
Robert Brauer et al. Accepted by A&A https://arxiv.org/pdf/1906.11582
Multiple-star systemにおいて、個々の星の周囲のcircumstellar diskがcircumbinary diskのemissionに及ぼす影響を調べる
Tau A• GGMultiple-starsystemにおける惑星形成を調べるのに良いターゲットである-（近くて大きい, d = 140pc）- 中心部に少なくとも2つ以上の星のbinaryが存在し、周囲にring-likecircumbinary diskが存在（190 - 260au）- GG Tau BとのBinaryでもある（separation ~ 1400au）

transfer (RT) simulation• Radiative
circumstellar diskを考慮- RT code: POLARIS• 観測結果との比較- circumstellar diskを考慮にいれた方が観測結果をよく再現する7. Sub-arcsecond (sub)millimeter imaging of the massive
protocluster G358.93-0.03: Discovery of 14 new methanol maserlines associated with a hot core
C. L. Brogan et al. Accepted by ApJL http://arxiv.org/pdf/1907.02470

Hot coreに付随する14のメタノールメーザーを新たに検出
Massive star-forming region G358.93-0.03- 2019/1/14に 6.7GHzのClass II CH3OH mase lineのflaringが始まった•• Observation
上記のfollow-up観測- ALMA, SMA

• Result
14のnew ClassII CH OH maser lineを初検出-3‣ Class II maserがTorsional State vt=2までpumpingすることの観測的証拠を初めて得た‣ State vt=2 のmaserはより多く減少している• Result
速度構造-‣ Maser: 曲線スパイラル速度構造を検出→ coherentな構造を示唆‣ CH3CH (thermal line): 直線構造

3. The Effect of Binarity on Circumstellar Disk Evolution
Scott A. Barenfeld et al. Accepted by ApJ

http://arxiv.org/pdf/1906.04878

4. Variability of young stellar objects in the star-forming region
Pelican Nebula
A. Bhardwaj et al. Accepted by A&A http://arxiv.org/pdf/1906.00256

5. The complex chemistry of hot cores in Sagittarius B2(N):Influence of cosmic-ray ionisation and thermal history
M. Bonfand et al. Accepted by A&A https://arxiv.org/pdf/1906.04695

8. Modeling C-Shock Chemistry in Isolated Molecular Outflows
Andrew M. Burkhardt et al. Accepted by ApJ http://arxiv.org/pdf/1906.08774

9. Molecular complexity on disk-scales uncovered by ALMA: The
chemical composition of the high-mass protostar AFGL 4176
Eva G. Bøgelund et al. Accepted by A&A http://arxiv.org/pdf/1906.06156

10. Upper limits on the water vapour content of the β Pictorisdebris disk
M. Cavallius et al. Accepted by A&A http://arxiv.org/pdf/1906.11106

11. Silicate features in the circumstellar envelopes of the Class I
binary source of HH 250
F. Comerón et al. Accepted by A&A http://www.eso.org/~fcomeron/hh250_spec_final.pdf