The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | DUTREY, Anne | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | GUILLOTEAU, S. | |
| dc.contributor.author | PIÉTU, V. | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | CHAPILLON, E. | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | WAKELAM, Valentine | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | DI FOLCO, E. | |
| dc.contributor.author | STOECKLIN, T. | |
| dc.contributor.author | DENIS-ALPIZAR, O. | |
| dc.contributor.author | GORTI, U. | |
| dc.contributor.author | TEAGUE, R. | |
| hal.structure.identifier | Max-Planck-Institut für Astronomie [MPIA] | |
| dc.contributor.author | HENNING, T. | |
| dc.contributor.author | SEMENOV, D. | |
| hal.structure.identifier | Observatoire astronomique de Strasbourg [ObAS] | |
| dc.contributor.author | GROSSO, N. | |
| dc.date.issued | 2017-11 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Context. Determining the gas density and temperature structures of protoplanetary disks is a fundamental task in order to constrain planet formation theories. This is a challenging procedure and most determinations are based on model-dependent assumptions. Aims. We attempt a direct determination of the radial and vertical temperature structure of the Flying Saucer disk, thanks to its favorable inclination of 90 degrees.Methods. We present a method based on the tomographic study of an edge-on disk. Using ALMA, we observe at 0.5″ resolution the Flying Saucer in CO J = 2–1 and CS J = 5–4. This edge-on disk appears in silhouette against the CO J = 2–1 emission from background molecular clouds in ρ Oph. The combination of velocity gradients due to the Keplerian rotation of the disk and intensity variations in the CO background as a function of velocity provide a direct measure of the gas temperature as a function of radius and height above the disk mid-plane.Results. The overall thermal structure is consistent with model predictions, with a cold (<12−15 K) CO-depleted mid-plane and a warmer disk atmosphere. However, we find evidence for CO gas along the mid-plane beyond a radius of about 200 au, coincident with a change of grain properties. Such behavior is expected in the case of efficient rise of UV penetration re-heating the disk and thus allowing CO thermal desorption or favoring direct CO photo-desorption. CO is also detected at up to 3–4 scale heights, while CS is confined to around 1 scale height above the mid-plane. The limits of the method due to finite spatial and spectral resolutions are also discussed.Conclusions. This method appears to be a very promising way to determine the gas structure of planet-forming disks, provided that the molecular data have an angular resolution which is high enough, on the order of 0.3−0.1″ at the distance of the nearest star-forming regions. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.subject.en | Astrophysics - Solar and Stellar Astrophysics | |
| dc.subject.en | Astrophysics - Earth and Planetary Astrophysics | |
| dc.subject.en | circumstellar matter | |
| dc.subject.en | protoplanetary disks | |
| dc.subject.en | radio lines: stars | |
| dc.title.en | The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201730645 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1706.02608 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A130 | |
| bordeaux.volume | 607 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01536626 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01536626v1 | |
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