imaging the candidate proto-planet HL Tau b Jane Greaves University of St Andrews Anita Richards, Tom Muxlow (Jodrell Bank Centre for Astrophysics) Ken Rice, Duncan Forgan, Bruce Sibthorpe (Edinburgh)
Jan 18, 2016
imaging the candidate proto-planet HL Tau b
Jane Greaves
University of St Andrews
Anita Richards, Tom Muxlow (Jodrell Bank Centre for Astrophysics)
Ken Rice, Duncan Forgan, Bruce Sibthorpe (Edinburgh)
growth phase
• when does dust grow into (unobservable) planetesimals?
Greaves & Rice 2011
HL Tau
• Class I low-mass protostar with massive envelope
Kwon, Looney & Mundy 2011CARMA, 1.3mm, 0.15"
Welch et al. 2004BIMA, 1.4mm, 0.3"
HL Tau b
• high-resolution imaging of large dust in the radio
Greaves, Richards, Rice & Muxlow 2008VLA, 1.3cm, 0.08-0.11"
...revisited
• re-observed recently with EVLA (preliminary reduction)
courtesy Disks@EVLA, PI Claire Chandler
disc instability
• SPH simulation naturally forms 8MJup object at 75 AU (vs. ~10-14MJup at 65 AU observed)
instability trigger?
• XZ Tau flyby of HL Tau at ~600 AU, ~1600 years ago?
Anglada et al. 2007Ducourant et al. 2005
disc interaction
• SPH simulation of such an encounter
Forgan & Rice
disc perturbation
• recent image with SCUBA-2 at 450 m
Greaves, Gibb, Sibthorpe et al.450 m, 8"
future observations
• have test-time for Key Project PEBBLES with eMERLIN at 5cm – survey of dust discs at longest wavelength so far!