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First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region | | C. L. Brogan
; L. M. Perez
; T. R. Hunter
; W. R. F. Dent
; A. S. Hales
; R. Hills
; S. Corder
; E. B. Fomalont
; C. Vlahakis
; Y. Asaki
; D. Barkats
; A. Hirota
; J. A. Hodge
; C. M. V. Impellizzeri
; R. Kneissl
; E. Liuzzo
; R. Lucas
; N. Marcelino
; S. Matsushita
; K. Nakanishi
; N. Phillips
; A. M. S. Richards
; I. Toledo
; R. Aladro
; D. Broguiere
; J. R. Cortes
; P. C. Cortes
; V. Dhawan
; D. Espada
; F. Galarza
; D. Garcia-Appadoo
; L. Guzman-Ramirez
; E. M. Humphreys
; T. Jung
; S. Kameno
; R. A. Laing
; S. Leon
; G. Marconi
; B. Nikolic
; L. -A. Nyman
; M. Radiszcz
; A. Remijan
; J. A. Rodon
; T. Sawada
; S. Takahashi
; R. P. J. Tilanus
; B. Vila Vilaro
; L. C. Watson
; T. Wiklind
; E. Akiyama
; E. Chapillon
; I. de Gregorio
; J. Di Francesco
; F. Gueth
; A. Kawamura
; C.-F. Lee
; Q. Nguyen Luong
; J. Mangum
; V. Pietu
; P. Sanhueza
; K. Saigo
; S. Takakuwa
; C. Ubach
; T. van Kempen
; A. Wootten
; A. Castro-Carrizo
; H. Francke
; J. Gallardo
; J. Garcia
; S. Gonzalez
; T. Hill
; T. Kaminski
; Y. Kurono
; H.-Y. Liu
; C. Lopez
; F. Morales
; K. Plarre
; G. Schieven
; L. Testi
; L. Videla
; E. Villard
; P. Andreani
; J. E. Hibbard
; K. Tatematsu
; ALMA Partnership
; | | Date: |
9 Mar 2015 | | Abstract: | We present Atacama Large Millimeter/submillimeter Array (ALMA) observations
from the 2014 Long Baseline Campaign in dust continuum and spectral line
emission from the HL Tau region. The continuum images at wavelengths of 2.9,
1.3, and 0.87 mm have unprecedented angular resolutions of 0.075 arcseconds (10
AU) to 0.025 arcseconds (3.5 AU), revealing an astonishing level of detail in
the circumstellar disk surrounding the young solar analogue HL Tau, with a
pattern of bright and dark rings observed at all wavelengths. By fitting
ellipses to the most distinct rings, we measure precise values for the disk
inclination (46.72pm0.05 degrees) and position angle (+138.02pm0.07 degrees).
We obtain a high-fidelity image of the 1.0 mm spectral index ($alpha$), which
ranges from $alphasim2.0$ in the optically-thick central peak and two
brightest rings, increasing to 2.3-3.0 in the dark rings. The dark rings are
not devoid of emission, we estimate a grain emissivity index of 0.8 for the
innermost dark ring and lower for subsequent dark rings, consistent with some
degree of grain growth and evolution. Additional clues that the rings arise
from planet formation include an increase in their central offsets with radius
and the presence of numerous orbital resonances. At a resolution of 35 AU, we
resolve the molecular component of the disk in HCO+ (1-0) which exhibits a
pattern over LSR velocities from 2-12 km/s consistent with Keplerian motion
around a ~1.3 solar mass star, although complicated by absorption at low
blue-shifted velocities. We also serendipitously detect and resolve the nearby
protostars XZ Tau (A/B) and LkHa358 at 2.9 mm. | | Source: | arXiv, 1503.2649 | | Services: | Forum | Review | PDF | Favorites | |
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