skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity

Abstract

We report the results of ALMA observations of a protoplanetary disk surrounding the Herbig Ae star AB Aurigae. We obtained high-resolution (0.″1; 14 au) images in {sup 12}CO J = 2 − 1 emission and in the dust continuum at the wavelength of 1.3 mm. The continuum emission is detected at the center and at the ring with a radius ( r ) of ∼120 au. The CO emission is dominated by two prominent spirals within the dust ring. These spirals are trailing and appear to be about 4 times brighter than their surrounding medium. Their kinematics is consistent with Keplerian rotation at an inclination of 23°. The apparent two-arm-spiral pattern is best explained by tidal disturbances created by an unseen companion located at r of 60–80 au, with dust confined in the pressure bumps created outside this companion orbit. An additional companion at r of 30 au, coinciding with the peak CO brightness and a large pitch angle of the spiral, would help to explain the overall emptiness of the cavity. Alternative mechanisms to excite the spirals are discussed. The origin of the large pitch angle detected here remains puzzling.

Authors:
; ;  [1]; ; ; ;  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11]
  1. Academia Sinica, Institute of Astronomy and Astrophysics, Taipei, Taiwan (China)
  2. Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, alle Geoffroy Saint-Hilaire, F-33615 Pessac (France)
  3. Department of Physics, National Taiwan University, Taiwan (China)
  4. Division of Liberal Arts, Kogakuin University, 1-24-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-8677 (Japan)
  5. Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602 (Japan)
  6. College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512 (Japan)
  7. IRAM, 300 rue de la Piscine, Domaine Universitaire, F-38406 Saint-Martin-d’Hères (France)
  8. Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 (Japan)
  9. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  10. Subaru Telescope, National Astronomical Observatory of Japan, 650 North Aohoku Place, Hilo, HI 96720 (United States)
  11. Astrobiology Center of NINS 2-21-1, Osawa, Mitaka, Tokyo, 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22663653
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 840; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BIOMEDICAL RADIOGRAPHY; BRIGHTNESS; CARBON 12; CARBON MONOXIDE; DISTURBANCES; DUSTS; EMISSION; ORBITS; PLANETS; PROTOPLANETS; RESOLUTION; ROTATION; STARS; WAVELENGTHS

Citation Formats

Tang, Ya-Wen, Gu, Pin-Gao, Ho, Paul T. P., Guilloteau, Stephane, Dutrey, Anne, Chapillon, Edwige, Folco, Emmanuel di, Muto, Takayuki, Shen, Bo-Ting, Inutsuka, Shu-ichiro, Momose, Munetake, Pietu, Vincent, Fukagawa, Misato, Corder, Stuartt, Ohashi, Nagayoshi, and Hashimoto, Jun, E-mail: ywtang@asiaa.sinica.edu.tw. Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6AF7.
Tang, Ya-Wen, Gu, Pin-Gao, Ho, Paul T. P., Guilloteau, Stephane, Dutrey, Anne, Chapillon, Edwige, Folco, Emmanuel di, Muto, Takayuki, Shen, Bo-Ting, Inutsuka, Shu-ichiro, Momose, Munetake, Pietu, Vincent, Fukagawa, Misato, Corder, Stuartt, Ohashi, Nagayoshi, & Hashimoto, Jun, E-mail: ywtang@asiaa.sinica.edu.tw. Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity. United States. doi:10.3847/1538-4357/AA6AF7.
Tang, Ya-Wen, Gu, Pin-Gao, Ho, Paul T. P., Guilloteau, Stephane, Dutrey, Anne, Chapillon, Edwige, Folco, Emmanuel di, Muto, Takayuki, Shen, Bo-Ting, Inutsuka, Shu-ichiro, Momose, Munetake, Pietu, Vincent, Fukagawa, Misato, Corder, Stuartt, Ohashi, Nagayoshi, and Hashimoto, Jun, E-mail: ywtang@asiaa.sinica.edu.tw. Mon . "Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity". United States. doi:10.3847/1538-4357/AA6AF7.
@article{osti_22663653,
title = {Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity},
author = {Tang, Ya-Wen and Gu, Pin-Gao and Ho, Paul T. P. and Guilloteau, Stephane and Dutrey, Anne and Chapillon, Edwige and Folco, Emmanuel di and Muto, Takayuki and Shen, Bo-Ting and Inutsuka, Shu-ichiro and Momose, Munetake and Pietu, Vincent and Fukagawa, Misato and Corder, Stuartt and Ohashi, Nagayoshi and Hashimoto, Jun, E-mail: ywtang@asiaa.sinica.edu.tw},
abstractNote = {We report the results of ALMA observations of a protoplanetary disk surrounding the Herbig Ae star AB Aurigae. We obtained high-resolution (0.″1; 14 au) images in {sup 12}CO J = 2 − 1 emission and in the dust continuum at the wavelength of 1.3 mm. The continuum emission is detected at the center and at the ring with a radius ( r ) of ∼120 au. The CO emission is dominated by two prominent spirals within the dust ring. These spirals are trailing and appear to be about 4 times brighter than their surrounding medium. Their kinematics is consistent with Keplerian rotation at an inclination of 23°. The apparent two-arm-spiral pattern is best explained by tidal disturbances created by an unseen companion located at r of 60–80 au, with dust confined in the pressure bumps created outside this companion orbit. An additional companion at r of 30 au, coinciding with the peak CO brightness and a large pitch angle of the spiral, would help to explain the overall emptiness of the cavity. Alternative mechanisms to excite the spirals are discussed. The origin of the large pitch angle detected here remains puzzling.},
doi = {10.3847/1538-4357/AA6AF7},
journal = {Astrophysical Journal},
number = 1,
volume = 840,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}