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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 660861.0, MPI für Astronomie / Publikationen_mpia
Search for rapid inner disk re-arrangements in a young eruptive star
Authors:Kóspál, Agnes; Aacute; Brahám, P.; Kun, M.; Henning, Th.
Date of Publication (YYYY-MM-DD):2012-01
Title of Proceedings:From Atoms to Pebbles: Herschel's view of Star and Planet Formation
Start Page:id. 35
Name of Conference/Meeting:From Atoms to Pebbles: Herschel's view of Star and Planet Formation
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Young eruptive stars form a spectacular class of Sun-like pre-main sequence objects. They are characterized by strong optical outbursts due to enhanced accretion from the circumstellar disk onto the star. Recently, some unusual eruptive stars were identified where the brightening was due partly to enhanced accretion and partly to a dust-clearing event which reduced the extinction along the line of sight. In 2010, the outburst of a so-far unknown young star, V2492 Cyg, provided an opportunity to study the dust clearing phenomenon. Here we report on the first results of our coordinated Herschel, Spitzer, and ground-based monitoring of V2492 Cyg. Comparing the amplitude of observed variability at different wavelengths from optical to far-infrared, we investigate the physical cause of the extinction changes towards the star. We consider two scenarios: (1) a transient appearance/disappearance of a large amount of dust in the system either due to dust condensation/evaporation driven by the changing accretion heating, or being released from the disk surface by turbulence; (2) a pre-existing, long-lived dust structure that moves in/out of the line of sight, similarly to the orbiting warp in the inner disk of the low-mass young star LRLL 31. The Herschel/PACS 70 and 160 μm light curves trace the effect of rapid inner disk re-arrangements on the outer cold disk and help to decide between the two scenarios.
Comment of the Author/Creator:Date: 2012 online, March 1, 2012
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012faph.confE..35K [ID No:1]
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