THE STAR FORMATION NEWSLETTER No.291-14 March 2017 2017/04/28 16-20 16. X-Shooter spectroscopy of young stellar objects in Lupus. Atmospheric parameters, membership and activity diagnostics 17. The evolution of protoplanetary disks from their taxonomy in scattered light: Group I vs Group II 18. Very High Excitation Lines of H2 in the Orion Molecular Cloud Outflow 19. Dissecting the molecular structure of the Orion B: Insight from Principal Component Analysis 20. Thermochemical modelling of brown dwarf discs
X-Shooter spectroscopy of young stellar objects in Lupus A. Frasca et al. Accepted by A&A https://arxiv.org/pdf/1703.01251 Determination of atmospheric parameters from X-shooter spectra of 102 YSO candidates Targets: 102 YSO candidates in Lupus I, II, III, and IV clouds - 150-200 pc Class II, ClassIII ( ) - - - Atmospheric parameter Class III 102 YSO candidates (95: Class II, 7: Class III) VLT/X-shooter parameter Data sample - Telescope: VLT - Instrument: X-shooter (wide band & intermediate resolution spectrograph) - Paramaters (300-560 nm) (550-1020 nm) (1020-2480 nm)
Results - ROTFIT code Effective temperature (Teff), surface gravity (log g), radial velocity (RV), projected rotational velocity (v sin i) : σteff = 70 K, σlog g = 0.21 dex, σrv = 2.3 km/s, σv sin i = 4 km/s - 13/102 Lupus (by their RV, very low log g) 11 Giants (RGB AGB phase) 2 lithium-rich giants Giants? litium rich
Results - Teff - Hα flux Class III emission chromospheric Class II chromospheric, accretion accretion Border (by Frasca et al. 2015) Bolometric flux (FHα/σTeff 4 ) Class II White&Basri(2003) accretion Class III Transition disk chromospheric emission - Flux per unit surface accretion luminosity line-luminosity accretion luminosity calibration effect " " (emission line accretion )
Results - FCall1842/FCall8498 Optically thick emission source photosphere accretion shock - FHα/FHβ ~ optically thick emission Call with smaller optical depth
The evolution of protoplanetary disks from their taxonomy in scattered light: Group I vs. Group II A. Garufi et al. Accepted by A&A https://arxiv.org/pdf/1703.01512 Near-IR observations of 6 Group II disks in scattered light Group I disk vs. Group II disk - MIR-FIR SED power-law fit : Group II (flat disk) - power-law : Group I (flaring disk) - Group I Group II e.g. Group I Group II - Group I Group II NIR-IR scattered light Group I disk evolution
Sample - 6 Group II disk - archive data 11 B-F type star (10: Group I, 1: Group II) Observation - Telescope: VLT - Instrument: AO-assisted NAOS/CONICA - Mode: Polarimetric Differential Mode Results - 3/6 - HD163296 CO snowline ring-structure - HD152404 (AK Sco) HD142666 100 AU disk - Group I, Group II 5 AU disk cavity - Group I II
Conclusion - Group II Group I - Group II HD163296: Group I HD152404 (AK Sco) HD142666: Group I
Very High Extinction Lines of H2 in the Orion Molecular Cloud Outflow T. R. Geballe et al. Accepted by ApJ http://arxiv.org/pdf/1702.06184 K-band spectral observation of OMC-1 outflow Pike et al. 2016 (ApJ) - Harbin-Hero 7 (HH7) bowshock K-band - 6000 K ~ 50000 K H2-2 98.5 % : T = ~ 1800 K ( ) 1.5 % : T = ~ 5000 K 5000 K (Hot H2 ) OMC-1 K-band Observation - Telescope: Gemini - Instrument: GNIRS (near-infrared spectrograph)
Results - OMC-1 ~5000K %??
Dissecting the molecular structure of the Orion B cloud: Insight from Principal Component Analysis P. Gratier et al. Accepted by A&A https://arxiv.org/pdf/1701.04205 Principal component analysis for Orion B cloud - Orion B Principal Component Analysis (PCA) Principal Component Analysis (PCA): - (PC) (wikipedia) http://cnx.org/resources/269e78e2506cdbdc7f45ca17bb7d83491ce0c644/pca.jpg
Data α ashin (x/α) (α=0.64 K)
Results - -
Results - 1-3 (PC1-PC3) H2, UV radiation field emission PCA
Thermochemical modelling of brown dwarf disks A.J. Greenwood et al. Accepted by A&A http://arxiv.org/pdf/1702.04744 Thermochemical modelling of brown dwarf protoplanetary dies Brown dwarf protoplanetary disk - T tauri disk T tauri disk - ALMA r ~ 10 AU CO, continuum Thermodynamical model ALMA disk HCN, HCO+, CO Model - Code: ProDiMo code - ρoph 102 12 CO(3-2), continuum small grid of brown dwarf model - T tauri disk Brown dwarf disk 2-D radiation thermochemical model
Model - SED - 12CO(3-2) - Parameter
Results - brown dwarf disk HCO+, HCN, CO flux ratio T tauri disk