Photo-reverberation mapping of a protoplanetary accretion disk around a T Tauri star

Meng, Huan Y.A. and Plavchan, Peter and Rieke, George H. and Cody, Ann Marie and Guth, Tina and Stauffer, John and Covey, Kevin and Carey, Sean and Ciardi, David and Duran-Rojas, Maria C. and Gutermuth, Robert A. and Morales-Calderon, Maria and Rebull, Luisa M. and Watson, Alan M. (2016) Photo-reverberation mapping of a protoplanetary accretion disk around a T Tauri star. The Astrophysical Journal, 823 (1). pp. 58-72. ISSN 0004-637X

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Abstract

Theoretical models and spectroscopic observations of newborn stars suggest that protoplantary disks have an inner 'wall' at a distance set by the disk interaction with the star. Around T Tauri stars, the size of this disk hole is expected to be on a 0.1 au scale that is unresolved by current adaptive optics imaging, though some model-dependent constraints have been obtained by near-infrared interferometry. Here we report the first measurement of the inner disk wall around a solar-mass young stellar object, YLW 16B in the ρ Ophiuchi star-forming region, by detecting the light-travel time of the variable radiation from the stellar surface to the disk. Consistent time lags were detected on two nights, when the time series in H (1.6 μm) and K (2.2 μm) bands were synchronized while the 4.5 μm emission lagged by 74.5 ± 3.2 s. Considering the nearly edge-on geometry of the disk, the inner rim should be 0.084 au from the protostar on average, with an error of order 0.01 au. This size is likely larger than the range of magnetospheric truncations and consistent with an optically and geometrically thick disk front at the dust sublimation radius at ∼1500 K. The widths of the cross-correlation functions between the data in different wavebands place possible new constraints on the geometry of the disk.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 09 Jun 2017 07:12
Last Modified: 27 Jun 2017 00:19
Uncontrolled Keywords: accretion; accretion disks; circumstellar matter; protoplanetary disks; stars; YLW 16B; T Tauri; Herbig Ae/Be;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/0004-637X/823/1/58
URI: http://eprints.usq.edu.au/id/eprint/32192

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