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Coronagraphic imaging of three weak-line T Tauri stars: evidence of planetary formation around PDS 70

Riaud, P. and Mawet, D. and Absil, O. and Boccaletti, A. and Baudoz, P. and Herwats, E. and Surdej, J. (2006) Coronagraphic imaging of three weak-line T Tauri stars: evidence of planetary formation around PDS 70. Astronomy and Astrophysics, 458 (1). pp. 317-325. ISSN 0004-6361. doi:10.1051/0004-6361:20065232.

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Context.High angular resolution imaging of nearby pre-main sequence stars with ages between 1 and 30 Myr can give valuable information on planet formation mechanisms. This range of ages is thought to correspond to the dissipation of the optically thick dust disks surrounding young stars and to the end of the planet formation. Aims.This paper presents new observations of three weak-line T Tauri Stars (WTTS) of intermediate ages ranging from 7 to 16 Myr. It aims at increasing the knowledge and sample of circumstellar disks around "old" WTTS. Methods.We observed three stars with the VLT's NAOS-CONICA adaptive optics system in coronagraphic mode. The four-quadrant phase mask coronagraph was used to improve the dynamic range (by a factor of ~100) while preserving the high angular resolution (inner working angle of 0".15). Results.One object of our sample (PDS 70), a K5 star, exhibits a brown dwarf companion and a disk in scattered light with a surface brightness power law of r^-2.8, extending from a distance of 14 to 140 AU (assuming a stellar distance of 140 pc) and an integrated luminosity of 16.7 mJy in the K_s-band. The mass of the companion can be estimated to be within a range between 27 and 50 Jupiter masses with an effective temperature of 2750 ± 100K. This object also shows a resolved outflow stretching up to ~550 AU. Conclusions.This newly detected circumstellar disk shows strong similarities with the disk around TW Hya, and adds to the observed population of "old" TTS surrounded by circumstellar material. Moreover, three clues of planetary formation are brought to light by this study.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mawet, D.0000-0002-8895-4735
Absil, O.0000-0002-4006-6237
Boccaletti, A.0000-0001-9353-2724
Surdej, J.0000-0002-7005-1976
Additional Information:© 2006 ESO. Article published by EDP Sciences. Received 20 March 2006; accepted 20 June 2006. P.R. acknowledges the financial support of the University of Liège. D.M. acknowledges the financial support of the Belgian “Fonds pour la formation à la Recherche dans l’Industrie et dans l’Agriculture”. O.A. acknowledges the financial support of the “Fond National de la Recherche Scientifique”. We thank J.-C. Augereau for the helpful discussions concerning infrared odeling. We thank N. Ageorge, T. Szeifert, and D. Nürnberger for their excellent assistance during the coronagraphic observations on the NACO instrument. The authors are also grateful to the anonymous referee who helped improve the manuscript.
Funding AgencyGrant Number
University of LiègeUNSPECIFIED
Fonds pour la Formation à la Recherche dans l’índustrie et dans l’Ágriculture (FRIA-Belgium)UNSPECIFIED
Fond National de la Recherche scientifique de Belgique (FNRS)UNSPECIFIED
Subject Keywords:stars: planetary systems: protoplanetary disks; stars: circumstellar matter; instrumentation: adaptive optics; methods: observational
Issue or Number:1
Record Number:CaltechAUTHORS:20150526-162610244
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Official Citation:Riaud, P., Mawet, D., Absil, O., Boccaletti, A., Baudoz, P., Herwats, E., & Surdej, J. (2006). Coronagraphic imaging of three weak-line T Tauri stars: evidence of planetary formation around PDS 70. A&A, 458(1), 317-325.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57834
Deposited On:27 May 2015 23:17
Last Modified:10 Nov 2021 21:55

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