Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'487'895
Articles rated: 2609

28 March 2024
 
  » arxiv » 1306.0275

 Article overview


GASPS - a Herschel survey of gas and dust in Protoplanetary Disks: Summary and Initial Statistics
W.R.F. Dent ; W.F. Thi ; I. Kamp ; J.P. Williams ; F. Menard ; S.Andrews ; D. Ardila ; G. Aresu ; J-C. Augereau ; D. Barrado y Navascues ; S. Brittain ; A. Carmona ; D. Ciardi ; W. Danchi ; J. Donaldson ; G. Duchene ; C. Eiroa ; D.Fedele ; C. Grady ; I. de Gregorio-Molsalvo ; C. Howard ; N. Huelamo ; A. Krivov ; J. Lebreton ; R. Liseau ; C. Martin-Zaidi ; G. Mathews ; G. Meeus ; I. Mendigutia ; B. Montesinos ; M. Morales-Calderon ; A. Mora ; H. Nomura ; E. Pantin ; I. Pascucci ; N. Phillips ; C. Pinte ; L. Podio ; S.K. Ramsay ; B. Riaz ; P. Riviere-Marichalar ; A. Roberge ; G. Sandell ; E. Solano ; I. Tilling ; J.M. Torrelles ; B. Vandenbusche ; S. Vicente ; G.J. White ; P. Woitke ;
Date 3 Jun 2013
AbstractGASPS is a far-infrared line and continuum survey of protoplanetary and young debris disks using PACS on the Herschel Space Observatory. The survey includes [OI] at 63 microns, as well as 70, 100 and 160um continuum, with the brightest objects also studied in [OI]145um, [CII]157um, H2O and CO. Targets included T Tauri stars and debris disks in 7 nearby young associations, and a sample of isolated Herbig AeBe stars. The aim was to study the global gas and dust content in a wide disk sample, systemically comparing the results with models. In this paper we review the main aims, target selection and observing strategy. We show initial results, including line identifications, sources detected, and a first statistical study.
[OI]63um was the brightest line in most objects, by a factor of ~10. Detection rates were 49%, including 100% of HAeBe stars and 43% of T Tauri stars. Comparison with published dust masses show a dust threshold for [OI]63um detection of ~1e-5 M_solar. Normalising to 140pc distance, 32% with mass 1e-6 - 1e-5 M_solar, and a small number with lower mass were also detected. This is consistent with moderate UV excess and disk flaring. In most cases, continuum and line emission is spatially and spectrally unresolved, suggesting disk emission. ~10 objects were resolved, likely from outflows. Detection rates in [OI]145um, [CII]157um and CO J=18-17 were 20-40%, but [CII] was not correlated with disk mass, suggesting it arises instead from a compact envelope.
[OI] detection rates in T Tauri associations of ages 0.3-4Myr were ~50%. ~2 stars were detectable in associations of 5-20Myr, with no detections in associations of age >20Myr. Comparing with the total number of young stars, and assuming a ISM-like gas/dust ratio, this indicates that ~18% of stars retain a gas-rich disk of total mass >1M_Jupiter for 1-4Myr, 1-7% keep such disks for 5-10Myr, and none remain beyond 10-20Myr.
Source arXiv, 1306.0275
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica