1dwarf ISO217

1 2012/10/14
outflowenergymomentumcloud
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~0.25pc ~140AU
→ Mr~20 mag @ 160 pc()
R(λ/Δλ)~200001S/N~14
∝Mout 1/2
Outflow 7-8 several objects

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Author Object Mass instrumen
(Nature, 435, 652)
ρ Oph 102 60 MJ VLT+UVES [OI][SII]blue-shifted ouflow (BD outflow)
→ disk > 15AU
Whelan et al.
[OI]bipolar outflow
dMout/dt ~ 1.4×10-9 Msol/yr
VLT+UVES
Hαbipolar outflow
~ 6.75±2AU
Whelan et al.
outflow
109°)[SII] bipolar outflow red-
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Spectro-astrometry
seeing limitseveral x 10 mas (several AUs @ )
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blue shifted robe
1. SED fitting

2. outflowCaII, [FeI], [SII] bipolar jet [SII] spectro-astrometry
a few × 10 AU scalejet
2(2007)(Whelan+09a)
→ brown dwarf jet
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: ISO 217
~0.08 Msol (close to Hydrogen burning limit mass)
outflowBDs/VLMS
i~65 deg (Hα line profile; Muzerolle+05)
wind
Macc = 1.0×10-10 Msol/yr (Hα; Muz.+05; BD )
bipolar outflow
Mloss = 2-3× 10-10 Msol/yr (Whelan+09a)
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(optical – MIR)
ESO2.2m/Wide Field Imager, 2MASS, DENIS (R, I, J, H, K-
bands)
14.5μm spectrum) on Spitzer
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PHOENIX model (Hauschildt+99)
Teff=2960 K, log(g)=4.0, R*=0.6Rsol, Rin=4R* (dust destruction radius; 1500K)
RADMC (Dullemond & Dominik 04)
3Monte Carlo simulation)
inclination angle, disk mass, flaring, outer radius, vertical height (@ outer radius), dust grain distribution (well mixed), extinction (AV)

amorphous Mg-Fe silicates, 25% amorphous carbon grains (25%)
standard gas to dust ratio (=100)
size distribution : n∝a-3.5 (0.1-100 μm)
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PACS 70μm
Mdisk ~ 4×10-6 Msol
2. Observation and Results
Cross-dispersed echelle spectrograph
: 300-1100 nm
R(λ/Δλ)=40,000 (@1" slit); (Rmax = 80,000 or 110,000)
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UVES @VLT8.2m KUEYEN(UT2)
Stellar rest velocity
V0=(17.2±1.3) km/s
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Observed emission lines
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red-shifted tail
130 km/s
Hα
EW = -2~-3 (λ6716), -4~-5 (λ6731)
blue shifted/red shifted
blue-shifted: peak~ -19 km/s, -30~-50 km/s ( faint)
red-shifted : peak~ +34 km/s40-50km/ssharp decline
blue, red
red- blue-
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outflow
[SII]λ6716 : 4.3×103
[SII]λ6731 : 1.5×104
PA~193-
line profile
Whelean+09a2007red-/blue- rest velocity
Whelean+09a : +12.6 km/s (T Tau)
this work : +17.6 km/s ()
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Discussion:
Classical T Tauri starsBronw dwarfs Very-low mass starsdisk(cf. Harvey+12)
mass accretion(Macc), mass-loss rate (Mloss)
Macc(1×10-10 Msol/yr; Muzerolle+05) Mloss (2-3×10-10
Msol/yr; Whelan+09a)
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→ ISO
→ 100
2
→ one epoch
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±30 AU(190 mas)±40-50 km/s
bipolar outflow([SII] lines)
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8-10m+( )
break through
→ ELTs(30m)
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: < 50mas

1” slit (seeing ~ 0.5-0.9”)
outflow
offset
Hα : offsetaccretion flowbulk emmission
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(2) ISO-Cha1 217
[SII] bipolar outflow
red-shifted YSOs
Hα : offet
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BDs :
Mout/Macc~0.01-0.1
core BD?
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• HαHeI6678 (accretion flow)
outflow
60 M_J
Hα
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ρ Oph 102 – CO outflow SMA
12CO, 13CO, C18O (J=2->1), Δv=0.27 km/s
3.60"x 2.43", beam FWHM ~ 55“
blue-, red-shifted robe ~8" (~1000AU)
max. (radial)velocity = 2.2 km/s
bow shock structure ?
mass : 3.2e-5 Msol ~1.6e-4 Msol ()
i = 63-66 deg (disk SED fit), Rin ~ 6.8 Rsol, Mdisk ~ 9e-3 Msol, Rd~80AU
Mloss ~ 1.4e-9 Msol/yr <- TTSs 2
(MgSiO3;enstatite; 9.3um, Mg2SiO4; forsterite; 11.3um)
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Phan-Bao et al.(2008),
ApJ, 689, L141
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strong accretor (Ha 10% width ~270-300 km/s, EW~44-125A)
[NII]6583, [SII]6731 : blue-shift shift
lineshift-> LVC, HVC?
Hα : red-, blue-shift
minimum (projected) disk radius : 0.15" (< 22.5 AU at CrA SFR) (FELs red)
disk gap ~ 6.75 +- 2 AU (Hα red offset 45 +- 14 mas )
Hαoutflow -> Hαaccretionaccretionveiling CaII 8662
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