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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 Güth, Tina and Stauffer, John and Covey, Kevin and Carey, Sean and Ciardi, David and Duran-Rojas, Maria C. and Gutermuth, Robert A. and Morales-Calderón, María and Rebull, Luisa M. and Watson, Alan M. (2016) Photo-reverberation Mapping of a Protoplanetary Accretion Disk around a T Tauri Star. Astrophysical Journal, 823 (1). Art. No. 58. ISSN 0004-637X.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Plavchan, Peter0000-0002-8864-1667
Rieke, George H.0000-0003-2303-6519
Cody, Ann Marie0000-0002-3656-6706
Stauffer, John0000-0003-3595-7382
Covey, Kevin0000-0001-6914-7797
Carey, Sean0000-0002-0221-6871
Ciardi, David0000-0002-5741-3047
Gutermuth, Robert A.0000-0002-6447-899X
Rebull, Luisa M.0000-0001-6381-515X
Additional Information:© 2016 The American Astronomical Society. Received 2015 October 28; accepted 2016 March 17; published 2016 May 23. The authors thank Rachel Akeson, John Carpenter, Kevin Flaherty, Lynne Hillenbrand, Heather Knutson, Patrick Ogle, Inseok Song, Karl Stapelfeldt, and Barbara Whitney for their contributions to the YSOVAR project and valuable discussions on this work. H.Y.A.M. acknowledges support from the IPAC Visiting Graduate Research Fellowship program. P.P. acknowledges the work of Nancy Silbermann, William Mahoney, and the Spitzer scheduling team in scheduling the data volume intensive observations, and thanks Greg Doppmann for providing the Keck/NIRSPEC spectrum. K.C. acknowledges support provided by the NSF through grant AST-1449476. A. M.W. thanks the staff of the Observatorio Astronómico Nacional in Sierra San Pedro Mártir. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Facilities: CTIO:1.3 m, Mayall, OANSPM:HJT, SOAR, Spitzer (IRAC).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Infrared Processing and Analysis Center (IPAC)UNSPECIFIED
Subject Keywords:accretion, accretion disks; circumstellar matter; protoplanetary disks; stars: individual (YLW 16B) ; stars: variables: T Tauri, Herbig Ae/Be
Issue or Number:1
Record Number:CaltechAUTHORS:20160624-091510232
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Official Citation:Huan Y. A. Meng et al 2016 ApJ 823 58
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68653
Deposited By: Ruth Sustaita
Deposited On:24 Jun 2016 17:18
Last Modified:01 Nov 2019 21:19

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