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Title: GAS GAPS IN THE PROTOPLANETARY DISK AROUND THE YOUNG PROTOSTAR HL TAU

Abstract

We have analyzed the HCO{sup +} (1–0) data of the Class I–II protostar, HL Tau, obtained from the Atacama Large Millimeter/submillimeter Array long baseline campaign. We generated the HCO{sup +} image cube at an angular resolution of ∼0.″07 (∼10 au) and performed azimuthal averaging on the image cube to enhance the signal-to-noise ratio and measure the radial profile of the HCO{sup +} integrated intensity. Two gaps at radii of ∼28 and ∼69 au and a central cavity are identified in the radial intensity profile. The inner HCO{sup +} gap is coincident with the millimeter continuum gap at a radius of 32 au. The outer HCO{sup +} gap is located at the millimeter continuum bright ring at a radius of 69 au and overlaps with the two millimeter continuum gaps at radii of 64 and 74 au. On the contrary, the presence of the central cavity is likely due to the high optical depth of the 3 mm continuum emission and not the depletion of the HCO{sup +} gas. We derived the HCO{sup +} column density profile from its intensity profile. From the column density profile, the FWHM widths of the inner and outer HCO{sup +} gaps are both estimated tomore » be ∼14 au, and their depths are estimated to be ∼2.4 and ∼5.0. These results are consistent with the expectation from the gaps opened by forming (sub-)Jovian mass planets, while placing tight constraints on the theoretical models solely incorporating the variation of dust properties and grain sizes.« less

Authors:
; ; ; ;  [1];  [2];  [3]
  1. Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China)
  2. European Southern Observatory (ESO), Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
  3. Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)
Publication Date:
OSTI Identifier:
22518564
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 820; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; GRAIN SIZE; HYDROCARBONS; IMAGES; MASS; MOLECULAR IONS; PLANETS; PROTOPLANETS; RESOLUTION; SIGNAL-TO-NOISE RATIO; VARIATIONS

Citation Formats

Yen, Hsi-Wei, Gu, Pin-Gao, Hirano, Naomi, Lee, Chin-Fei, Takakuwa, Shigehisa, Liu, Hauyu Baobab, and Puspitaningrum, Evaria. GAS GAPS IN THE PROTOPLANETARY DISK AROUND THE YOUNG PROTOSTAR HL TAU. United States: N. p., 2016. Web. doi:10.3847/2041-8205/820/2/L25.
Yen, Hsi-Wei, Gu, Pin-Gao, Hirano, Naomi, Lee, Chin-Fei, Takakuwa, Shigehisa, Liu, Hauyu Baobab, & Puspitaningrum, Evaria. GAS GAPS IN THE PROTOPLANETARY DISK AROUND THE YOUNG PROTOSTAR HL TAU. United States. https://doi.org/10.3847/2041-8205/820/2/L25
Yen, Hsi-Wei, Gu, Pin-Gao, Hirano, Naomi, Lee, Chin-Fei, Takakuwa, Shigehisa, Liu, Hauyu Baobab, and Puspitaningrum, Evaria. 2016. "GAS GAPS IN THE PROTOPLANETARY DISK AROUND THE YOUNG PROTOSTAR HL TAU". United States. https://doi.org/10.3847/2041-8205/820/2/L25.
@article{osti_22518564,
title = {GAS GAPS IN THE PROTOPLANETARY DISK AROUND THE YOUNG PROTOSTAR HL TAU},
author = {Yen, Hsi-Wei and Gu, Pin-Gao and Hirano, Naomi and Lee, Chin-Fei and Takakuwa, Shigehisa and Liu, Hauyu Baobab and Puspitaningrum, Evaria},
abstractNote = {We have analyzed the HCO{sup +} (1–0) data of the Class I–II protostar, HL Tau, obtained from the Atacama Large Millimeter/submillimeter Array long baseline campaign. We generated the HCO{sup +} image cube at an angular resolution of ∼0.″07 (∼10 au) and performed azimuthal averaging on the image cube to enhance the signal-to-noise ratio and measure the radial profile of the HCO{sup +} integrated intensity. Two gaps at radii of ∼28 and ∼69 au and a central cavity are identified in the radial intensity profile. The inner HCO{sup +} gap is coincident with the millimeter continuum gap at a radius of 32 au. The outer HCO{sup +} gap is located at the millimeter continuum bright ring at a radius of 69 au and overlaps with the two millimeter continuum gaps at radii of 64 and 74 au. On the contrary, the presence of the central cavity is likely due to the high optical depth of the 3 mm continuum emission and not the depletion of the HCO{sup +} gas. We derived the HCO{sup +} column density profile from its intensity profile. From the column density profile, the FWHM widths of the inner and outer HCO{sup +} gaps are both estimated to be ∼14 au, and their depths are estimated to be ∼2.4 and ∼5.0. These results are consistent with the expectation from the gaps opened by forming (sub-)Jovian mass planets, while placing tight constraints on the theoretical models solely incorporating the variation of dust properties and grain sizes.},
doi = {10.3847/2041-8205/820/2/L25},
url = {https://www.osti.gov/biblio/22518564}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 820,
place = {United States},
year = {Fri Apr 01 00:00:00 EDT 2016},
month = {Fri Apr 01 00:00:00 EDT 2016}
}