| Issue |
A&A
Volume 652, August 2021
|
|
|---|---|---|
| Article Number | L8 | |
| Number of page(s) | 8 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202141177 | |
| Published online | 09 August 2021 | |
Letter to the Editor
Investigating point sources in MWC 758 with SPHERE⋆
1
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 Place Jules Janssen, 92195 Meudon, France
e-mail: anthony.boccaletti@obspm.fr
2
CEA, IRFU, DAp, AIM, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, CNRS, 91191 Gif-sur-Yvette, France
3
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
4
Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France
5
CRAL, UMR 5574, CNRS, Université de Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
6
INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
7
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
8
Leiden Observatory, Leiden University, 2300 RA Leiden, The Netherlands
9
Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
10
Escuela de Ingeniería Industrial, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
11
SUPA, Institute for Astronomy, The University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
12
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
13
ETH Zurich, Institute for Astronomy, Wolfgang-Pauli-Str. 27, 8093 Zurich, Switzerland
14
Department of Astronomy, University of Michigan, 1085 S. University, Ann Arbor, MI 48109, USA
15
Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile
16
Núcleo Milenio de Formación Planetaria (NPF), Valparaíso, Chile
17
DOTA, ONERA, Université Paris Saclay, 91123 Palaiseau, France
Received:
25
April
2021
Accepted:
14
July
2021
Context. Spiral arms in protoplanetary disks could be shown to be the manifestation of density waves launched by protoplanets and propagating in the gaseous component of the disk. At least two point sources have been identified in the L band in the MWC 758 system as planetary mass object candidates.
Aims. We used VLT/SPHERE to search for counterparts of these candidates in the H and K bands, and to characterize the morphology of the spiral arms.
Methods. The data were processed with now-standard techniques in high-contrast imaging to determine the limits of detection, and to compare them to the luminosity derived from L band observations.
Results. In considering the evolutionary, atmospheric, and opacity models we were not able to confirm the two former detections of point sources performed in the L band. In addition, the analysis of the spiral arms from a dynamical point of view does not support the hypothesis that these candidates comprise the origin of the spirals.
Conclusions. Deeper observations and longer timescales will be required to identify the actual source of the spiral arms in MWC 758.
Key words: stars: individual: MWC 758 / protoplanetary disks / techniques: image processing / techniques: high angular resolution / planet-disk interactions
© A. Boccaletti et al. 2021
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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