MILLIMETER OBSERVATIONS OF THE TRANSITION DISK AROUND HD 135344B (SAO 206462)

Journal Article · Tue Nov 15 04:00:00 EST 2011 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/142/5/151· OSTI ID:21582808

Lyo, A-Ran ^[1]; Ohashi, Nagayoshi; Su, Yu-Nung ^[2]; Chunhua, Qi

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1. Korea Astronomy and Space Science Institute, 61-1, Hwaam-dong, Yuseong-gu, Daejeon 305-348 (Korea, Republic of)
2. Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan (China)

We present {approx}1'' resolution 1.3 mm dust continuum and spectral line ({sup 12}CO and {sup 13}CO J = 2-1) observations of the transitional disk system HD 135344B obtained with the Submillimeter Array. The disk shows a Keplerian rotation pattern with an inclination of {approx}11{sup 0}, based on the spatially and spectrally resolved {sup 12}CO and {sup 13}CO emission. The data show clear evidence for both dust and gas surface density reductions in the inner region of the disk (radius {approx}< 50 AU) from the continuum and {sup 13}CO J = 2-1 data, respectively. The presence of this inner cavity in both the dust and gas is more consistent with clearing by giant planet formation than by photoevaporation or by grain growth. There is also an indication of global CO gas depletion in the disk, as the mass estimated from {sup 13}CO emission ({approx}3.8 x 10{sup -4} M{sub sun}) is about two orders of magnitude lower than that derived from the 1.3 mm continuum ({approx}2.8 x 10{sup -2} M{sub sun}).

• OSTI ID: 21582808
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 5 Vol. 142; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CARBON 12
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DUSTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GRAIN GROWTH
ISOTOPES
LIGHT NUCLEI
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PLANETS
PROTOPLANETS
STABLE ISOTOPES
STARS