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Sensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars II: Stars in $\rho$ Oph and upper Scorpius

hal.structure.identifierAMOR 2015
dc.contributor.authorREBOUSSIN, Laura
hal.structure.identifierAMOR 2015
dc.contributor.authorGUILLOTEAU, S.
dc.contributor.authorSIMON, M.,
hal.structure.identifierObservatoire astronomique de Strasbourg [ObAS]
dc.contributor.authorGROSSO, N.,
hal.structure.identifierAMOR 2015
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierAMOR 2015
dc.contributor.authorDI FOLCO, E.
hal.structure.identifierAMOR 2015
dc.contributor.authorDUTREY, Anne
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorPIÉTU, V.,
dc.date.issued2015-04
dc.identifier.issn0004-6361
dc.description.abstractEnWe attempt to determine the molecular composition of disks around young low-mass stars in the $\rho$ Oph region and to compare our results with a similar study performed in the Taurus-Auriga region. We used the IRAM 30 m telescope to perform a sensitive search for CN N=2-1 in 29 T Tauri stars located in the $\rho$ Oph and upper Scorpius regions. $^{13}$CO J=2-1 is observed simultaneously to provide an indication of the level of confusion with the surrounding molecular cloud. The bandpass also contains two transitions of ortho-H$_2$CO, one of SO, and the C$^{17}$O J=2-1 line, which provides complementary information on the nature of the emission. Contamination by molecular cloud in $^{13}$CO and even C$^{17}$O is ubiquitous. The CN detection rate appears to be lower than for the Taurus region, with only four sources being detected (three are attributable to disks). H$_2$CO emission is found more frequently, but appears in general to be due to the surrounding cloud. The weaker emission than in Taurus may suggest that the average disk size in the $\rho$ Oph region is smaller than in the Taurus cloud. Chemical modeling shows that the somewhat higher expected disk temperatures in $\rho$ Oph play a direct role in decreasing the CN abundance. Warmer dust temperatures contribute to convert CN into less volatile forms. In such a young region, CN is no longer a simple, sensitive tracer of disks, and observations with other tracers and at high enough resolution with ALMA are required to probe the gas disk population.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.title.enSensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars II: Stars in $\rho$ Oph and upper Scorpius
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201525705
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1504.04542
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA31
bordeaux.volume578
bordeaux.peerReviewedoui
hal.identifierhal-01144121
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01144121v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2015-04&rft.volume=578&rft.spage=A31&rft.epage=A31&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=REBOUSSIN,%20Laura&GUILLOTEAU,%20S.&SIMON,%20M.,&GROSSO,%20N.,&WAKELAM,%20Valentine&rft.genre=article


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