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Separating extended disc features from the protoplanet in PDS 70 using VLT/SINFONI

Christiaens, V. and Casassus, S. and Absil, O. and Cantalloube, F. and Gomez Gonzalez, C. and Girard, J. and Ramírez, R. and Pairet, B. and Salinas, V. and Price, D. J. and Pinte, C. and Quanz, S. P. and Jordán, A. and Mawet, D. and Wahhaj, Z. (2019) Separating extended disc features from the protoplanet in PDS 70 using VLT/SINFONI. Monthly Notices of the Royal Astronomical Society, 486 (4). pp. 5819-5837. ISSN 0035-8711. doi:10.1093/mnras/stz1232.

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Transition discs are prime targets to look for protoplanets and study planet–disc interactions. We present VLT/SINFONI observations of PDS 70, a transition disc with a recently claimed embedded protoplanet. We take advantage of the angular and spectral diversity present in our data for an optimal PSF modelling and subtraction using principal component analysis (PCA). We report the redetection of PDS 70 b, both the front and far side of the outer disc edge, and the detection of several extended features in the annular gap. We compare spectral differential imaging applied before (PCA-SADI), and after (PCA-ASDI) angular differential imaging. Our tests suggest that PCA-SADI better recovers extended features, while PCA-ASDI is more sensitive to point sources. We adapted the negative fake companion (NEGFC) technique to infer the astrometry of the companion, and derived r = 193.5 ± 4.9 mas and PA =158.7° ± 3.0°. We used both NEGFC and ANDROMEDA to infer the K-band spectro-photometry of the protoplanet, and found results consistent with recent VLT/SPHERE observations, except for their 2018/02 epoch measurement in the K2 filter. Finally, we derived an upper limit of Ṁb < 1.26 × 10^(−7) [5M_(Jup)/M_b][R_b/R_(Jup)]M_(Jup) yr^(−1) for the accretion rate of the companion based on an adaptation of PCA-SADI/PCA-ASDI around the Brγ line (assuming no extinction).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Christiaens, V.0000-0002-0101-8814
Absil, O.0000-0002-4006-6237
Gomez Gonzalez, C.0000-0003-2050-1710
Girard, J.0000-0001-8627-0404
Price, D. J.0000-0002-4716-4235
Pinte, C.0000-0001-5907-5179
Quanz, S. P.0000-0003-3829-7412
Mawet, D.0000-0002-8895-4735
Wahhaj, Z.0000-0001-8269-324X
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 April 29. Received 2019 April 11; in original form 2019 February 20. VC is thankful to Sebastian Perez, Miriam Keppler, and Roy van Boekel for constructive discussions. VC also acknowledges Zachary Long and Mike Sitko for sharing their SpeX spectrum of PDS 70, and Alexander Heger for the use of Oxygen. VC and SC acknowledge support from the Millennium Science Initiative (Chilean Ministry of Economy) through grant RC130007. VC and OA acknowledge funding from the European Research Council under the European Union’s Seventh Framework Programme (ERC Grant Agreement No. 337569). We also acknowledge funding from the Australian Research Council via DP180104235. This work was supported by the Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE) (
Group:Astronomy Department
Funding AgencyGrant Number
Iniciativa Científica MilenioRC130007
European Research Council (ERC)337569
Australian Research CouncilDP180104235
Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE)UNSPECIFIED
Subject Keywords:techniques: image processing, planet–disc interactions, protoplanetary discs, stars: individual: PDS 70
Issue or Number:4
Record Number:CaltechAUTHORS:20190613-142206913
Persistent URL:
Official Citation:V Christiaens, S Casassus, O Absil, F Cantalloube, C Gomez Gonzalez, J Girard, R Ramírez, B Pairet, V Salinas, D J Price, C Pinte, S P Quanz, A Jordán, D Mawet, Z Wahhaj, Separating extended disc features from the protoplanet in PDS 70 using VLT/SINFONI, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 4, July 2019, Pages 5819–5837,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96396
Deposited By: George Porter
Deposited On:14 Jun 2019 22:10
Last Modified:16 Nov 2021 17:20

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