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

Title: MATRYOSHKA HOLES: NESTED EMISSION RINGS IN THE TRANSITIONAL DISK OPH IRS 48

Abstract

The processes that form transition disks-disks with depleted inner regions-are not well understood; possible scenarios include planet formation, grain growth, and photoevaporation. Disks with spatially resolved dust holes are rare, but, in general, even less is known about the gas structure. The disk surrounding the A0 star Oph IRS 48 in the nearby {rho} Ophiuchus region has a 30 AU radius hole previously detected in the 18.7 {mu}m dust continuum and in warm CO in the 5 {mu}m fundamental rovibrational band. We present here Submillimeter Array 880 {mu}m continuum imaging resolving an inner hole. However, the radius of the hole in the millimeter dust is only 13 AU, significantly smaller than measured at other wavelengths. The nesting structure of the disk is counter intuitive, with increasingly large radius rings of emission seen in the millimeter dust (12.9{sup +1.7}{sub -3.4} AU), 5 {mu}m CO (30 AU), and 18.7 {mu}m dust (peaking at 55 AU). We discuss possible explanations for this structure, including self-shadowing that cools the disk surface layers, photodissociation of CO, and photoevaporation. However, understanding this unusual disk within the stringent multi-wavelength spatial constraints will require further observations to search for cold atomic and molecular gas.

Authors:
; ; ;  [1];  [2]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS 78, Cambridge, MA 02138 (United States)
  2. Leiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden (Netherlands)
Publication Date:
OSTI Identifier:
22078487
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 758; 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; ACCRETION DISKS; CARBON MONOXIDE; COSMIC DUST; DISSOCIATION; EMISSION; GRAIN GROWTH; PHOTOLYSIS; PLANETS; STARS; WAVELENGTHS

Citation Formats

Brown, J. M., Rosenfeld, K. A., Andrews, S. M., Wilner, D. J., and Van Dishoeck, E. F., E-mail: joannabrown@cfa.harvard.edu. MATRYOSHKA HOLES: NESTED EMISSION RINGS IN THE TRANSITIONAL DISK OPH IRS 48. United States: N. p., 2012. Web. doi:10.1088/2041-8205/758/2/L30.
Brown, J. M., Rosenfeld, K. A., Andrews, S. M., Wilner, D. J., & Van Dishoeck, E. F., E-mail: joannabrown@cfa.harvard.edu. MATRYOSHKA HOLES: NESTED EMISSION RINGS IN THE TRANSITIONAL DISK OPH IRS 48. United States. doi:10.1088/2041-8205/758/2/L30.
Brown, J. M., Rosenfeld, K. A., Andrews, S. M., Wilner, D. J., and Van Dishoeck, E. F., E-mail: joannabrown@cfa.harvard.edu. Sat . "MATRYOSHKA HOLES: NESTED EMISSION RINGS IN THE TRANSITIONAL DISK OPH IRS 48". United States. doi:10.1088/2041-8205/758/2/L30.
@article{osti_22078487,
title = {MATRYOSHKA HOLES: NESTED EMISSION RINGS IN THE TRANSITIONAL DISK OPH IRS 48},
author = {Brown, J. M. and Rosenfeld, K. A. and Andrews, S. M. and Wilner, D. J. and Van Dishoeck, E. F., E-mail: joannabrown@cfa.harvard.edu},
abstractNote = {The processes that form transition disks-disks with depleted inner regions-are not well understood; possible scenarios include planet formation, grain growth, and photoevaporation. Disks with spatially resolved dust holes are rare, but, in general, even less is known about the gas structure. The disk surrounding the A0 star Oph IRS 48 in the nearby {rho} Ophiuchus region has a 30 AU radius hole previously detected in the 18.7 {mu}m dust continuum and in warm CO in the 5 {mu}m fundamental rovibrational band. We present here Submillimeter Array 880 {mu}m continuum imaging resolving an inner hole. However, the radius of the hole in the millimeter dust is only 13 AU, significantly smaller than measured at other wavelengths. The nesting structure of the disk is counter intuitive, with increasingly large radius rings of emission seen in the millimeter dust (12.9{sup +1.7}{sub -3.4} AU), 5 {mu}m CO (30 AU), and 18.7 {mu}m dust (peaking at 55 AU). We discuss possible explanations for this structure, including self-shadowing that cools the disk surface layers, photodissociation of CO, and photoevaporation. However, understanding this unusual disk within the stringent multi-wavelength spatial constraints will require further observations to search for cold atomic and molecular gas.},
doi = {10.1088/2041-8205/758/2/L30},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 758,
place = {United States},
year = {2012},
month = {10}
}