2015ApJ...808L...3A

Query : 2015ApJ...808L...3A

2015ApJ...808L...3A - Astrophys. J., 808, L3 (2015/July-3)

The 2014 ALMA long baseline campaign: first results from high angular resolution observations toward the HL Tau region.

ALMA PARTNERSHIP, BROGAN C.L., PEREZ L.M., HUNTER T.R., DENT W.R.F., HALES A.S., HILLS R.E., CORDER S., FOMALONT E.B., VLAHAKIS C., ASAKI Y., BARKATS D., HIROTA A., HODGE J.A., IMPELLIZZERI C.M.V., KNEISSL R., LIUZZO E., LUCAS R., MARCELINO N., MATSUSHITA S., NAKANISHI K., PHILLIPS N., RICHARDS A.M.S., TOLEDO I., ALADRO R., BROGUIERE D., CORTES J.R., CORTES P.C., ESPADA D., GALARZA F., GARCIA-APPADOO D., GUZMAN-RAMIREZ L., HUMPHREYS E.M., JUNG T., KAMENO S., LAING R.A., LEON S., MARCONI G., MIGNANO A., NIKOLIC B., NYMAN L.-A., RADISZCZ M., REMIJAN A., RODON J.A., SAWADA T., TAKAHASHI S., TILANUS R.P.J., VILA VILARO B., WATSON L.C., WIKLIND T., AKIYAMA E., CHAPILLON E., DE GREGORIO-MONSALVO I., DI FRANCESCO J., GUETH F., KAWAMURA A., LEE C.-F., NGUYEN LUONG Q., MANGUM J., PIETU V., SANHUEZA P., SAIGO K., TAKAKUWA S., UBACH C., VAN KEMPEN T., WOOTTEN A., CASTRO-CARRIZO A., FRANCKE H., GALLARDO J., GARCIA J., GONZALEZ S., HILL T., KAMINSKI T., KURONO Y., LIU H.-Y., LOPEZ C., MORALES F., PLARRE K., SCHIEVEN G., TESTI L., VIDELA L., VILLARD E., ANDREANI P., HIBBARD J.E. and TATEMATSU K.

Abstract (from CDS):

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 (10 AU) to 0". 025 (3.5 AU), revealing an astonishing level of detail in the circumstellar disk surrounding the young solar analog 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 () and position angle We obtain a high-fidelity image of the 1.0 mm spectral index (α), which ranges from 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, and 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 star, although complicated by absorption at low blueshifted velocities. We also serendipitously detect and resolve the nearby protostars XZ Tau (A/B) and LkHα358 at 2.9 mm.

Abstract Copyright: ∼

Journal keyword(s): protoplanetary disks - stars: formation - stars: individual: (HL Tau, XZ Tau, LkHα358) - submillimeter: planetary systems - techniques: interferometric

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO B0420-0127 Bla 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1263 3
2 PKS 0428+205 rG 04 31 03.76141386 +20 37 34.2648470   22.174   19.085   ~ 198 1
3 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 823 1
4 EM* LkHA 358 TT* 04 31 36.1433863008 +18 13 43.204853460     19.0     M0.9 97 0
5 V* V1213 Tau Or* 04 31 37.5055489536 +18 12 24.383952396           K7 605 0
6 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1546 0
7 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 797 0
8 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 466 2
9 QSO J0431+1731 BLL 04 31 57.37923719 +17 31 35.7751096       21.3   ~ 54 1
10 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
11 QSO B0507+179 Bla 05 10 02.36912937 +18 00 41.5815635   20.0 19.0 19.09   ~ 470 1
12 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1285 0

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