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BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL

De Boer, J. and Girard, J. H. and Canovas, H. and Min, M. and Sitko, M. and Ginski, C. and Jeffers, S. V. and Mawet, D. and Milli, J. and Rodenhuis, M. and Snik, F. and Keller, C. U. (2017) BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL. Monthly Notices of the Royal Astronomical Society: Letters, 466 (1). L7-L12. ISSN 1745-3925. doi:10.1093/mnrasl/slw219.

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Whether BP Piscium (BP Psc) is either a pre-main sequence T Tauri star at d ≈ 80 pc, or a post-main sequence G giant at d ≈ 300 pc is still not clear. As a first-ascent giant, it is the first to be observed with a molecular and dust disc. Alternatively, BP Psc would be among the nearest T Tauri stars with a protoplanetary disc (PPD). We investigate whether the disc geometry resembles typical PPDs, by comparing polarimetric images with radiative transfer models. Our Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE)/Zurich IMaging Polarimeter (ZIMPOL) observations allow us to perform polarimetric differential imaging, reference star differential imaging, and Richardson–Lucy deconvolution. We present the first visible light polarization and intensity images of the disc of BP Psc. Our deconvolution confirms the disc shape as detected before, mainly showing the southern side of the disc. In polarized intensity the disc is imaged at larger detail and also shows the northern side, giving it the typical shape of high-inclination flared discs. We explain the observed disc features by retrieving the large-scale geometry with MCMAX radiative transfer modelling, which yields a strongly flared model, atypical for discs of T Tauri stars.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Girard, J. H.0000-0001-8627-0404
Canovas, H.0000-0001-7668-8022
Min, M.0000-0003-1519-5069
Sitko, M.0000-0003-1799-1755
Mawet, D.0000-0002-8895-4735
Milli, J.0000-0001-9325-2511
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 October 20. Received 2016 October 20; in original form 2016 May 15. Published: 26 October 2016. The observations were taken during SPHERE science verification by the European Southern Observatory, Chile (ESO program ID: 60.A-9375(A)). We are thankful to the European Southern Observatory (ESO) support staff on Paranal and the SPHERE science verification team for their support and the successful observations. HC acknowledges support from the Spanish Economía, Industria y Competitividad grant AYA 2014-55840-P.
Group:Astronomy Department
Funding AgencyGrant Number
Ministerio de Economía, Industria y Competitividad (MINECO)AYA 2014-55840-P
Subject Keywords:polarization – techniques: high angular resolution – techniques: polarimetric – protoplanetary discs – circumstellar matter – stars: evolution
Issue or Number:1
Record Number:CaltechAUTHORS:20170929-082302721
Persistent URL:
Official Citation:J. de Boer, J. H. Girard, H. Canovas, M. Min, M. Sitko, C. Ginski, S. V. Jeffers, D. Mawet, J. Milli, M. Rodenhuis, F. Snik, C. U. Keller; BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL, Monthly Notices of the Royal Astronomical Society: Letters, Volume 466, Issue 1, 21 March 2017, Pages L7–L12,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81912
Deposited By: Tony Diaz
Deposited On:29 Sep 2017 16:49
Last Modified:15 Nov 2021 19:47

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