The nature of transition circumstellar disks : I. The ophiuchus molecular cloud

We have obtained millimeter-wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 26 <i>Spitzer</i>-selected transition circumstellar disks. All of our targets are located in the Ophiuchus molecular cloud (d ∼ 125pc) and ha...

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Autores principales: Cieza, Lucas A., Schreiber, Matthias R., Romero, Gisela Andrea, Mora, Marcelo D., Merin, Bruno, Swift, Jonathan J., Orellana, Mariana Dominga, Williams, Jonathan P., Harvey, Paul M., Evans, Neal J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82481
Aporte de:
id I19-R120-10915-82481
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries: general
Circumstellar matter
Protoplanetary disks
Stars: pre-main sequence
spellingShingle Ciencias Astronómicas
Binaries: general
Circumstellar matter
Protoplanetary disks
Stars: pre-main sequence
Cieza, Lucas A.
Schreiber, Matthias R.
Romero, Gisela Andrea
Mora, Marcelo D.
Merin, Bruno
Swift, Jonathan J.
Orellana, Mariana Dominga
Williams, Jonathan P.
Harvey, Paul M.
Evans, Neal J.
The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
topic_facet Ciencias Astronómicas
Binaries: general
Circumstellar matter
Protoplanetary disks
Stars: pre-main sequence
description We have obtained millimeter-wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 26 <i>Spitzer</i>-selected transition circumstellar disks. All of our targets are located in the Ophiuchus molecular cloud (d ∼ 125pc) and have spectral energy distributions (SEDs) suggesting the presence of inner opacity holes. We use these ground-based data to estimate the disk mass, multiplicity, and accretion rate for each object in our sample in order to investigate the mechanisms potentially responsible for their inner holes. We find that transition disks are a heterogeneous group of objects, with disk masses ranging from <0.6 to 40 M<sub>JUP</sub> and accretion rates ranging from <10-11 to 10 -7 M ⊙yr-1, but most tend to have much lower masses and accretion rates than "full disks" (i.e., disks without opacity holes). Eight of our targets have stellar companions: six of them are binaries and the other two are triple systems. In four cases, the stellar companions are close enough to suspect they are responsible for the inferred inner holes. We find that nine of our 26 targets have low disk mass (<2.5 M<sub>JUP</sub>) and negligible accretion (<10-11 M ⊙yr-1), and are thus consistent with photoevaporating (or photoevaporated) disks. Four of these nine non-accreting objects have fractional disk luminosities <10-3 and could already be in a debris disk stage. Seventeen of our transition disks are accreting. Thirteen of these accreting objects are consistent with grain growth. The remaining four accreting objects have SEDs suggesting the presence of sharp inner holes, and thus are excellent candidates for harboring giant planets.
format Articulo
Articulo
author Cieza, Lucas A.
Schreiber, Matthias R.
Romero, Gisela Andrea
Mora, Marcelo D.
Merin, Bruno
Swift, Jonathan J.
Orellana, Mariana Dominga
Williams, Jonathan P.
Harvey, Paul M.
Evans, Neal J.
author_facet Cieza, Lucas A.
Schreiber, Matthias R.
Romero, Gisela Andrea
Mora, Marcelo D.
Merin, Bruno
Swift, Jonathan J.
Orellana, Mariana Dominga
Williams, Jonathan P.
Harvey, Paul M.
Evans, Neal J.
author_sort Cieza, Lucas A.
title The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
title_short The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
title_full The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
title_fullStr The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
title_full_unstemmed The nature of transition circumstellar disks : I. The ophiuchus molecular cloud
title_sort nature of transition circumstellar disks : i. the ophiuchus molecular cloud
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/82481
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