Reference : Discovery of a point-like source and a third spiral arm in the transition disk around...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/218483
Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758
English
Reggiani, Maddalena mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Christiaens, Valentin mailto [Université de Liège - ULiège > > > Form. doct. sc. (sc. spatiales - paysage)]
Absil, Olivier mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Mawet, D. [> >]
Huby, Elsa [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Choquet, E. [> >]
Gómez González, Carlos [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Ruane, G. [> >]
Femenia, B. [> >]
Serabyn, E. [> >]
Matthews, K. [> >]
Barraza, M. [> >]
Carlomagno, Brunella mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Defrere, Denis mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Delacroix, Christian [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Habraken, Serge mailto [Université de Liège - ULiège > Département de physique > Optique - Hololab >]
Jolivet, Aïssa mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Karlsson, M. [> >]
Orban De Xivry, Gilles mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Piron, Pierre [Université de Liège - ULiège > Département de physique > Optique - Hololab >]
Surdej, Jean mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Vargas Catalan, E. [> >]
Wertz, O. [> >]
29-Mar-2018
Astronomy and Astrophysics
Springer
611
A74
Yes (verified by ORBi)
International
0004-6361
1432-0746
Germany
[en] protoplanetary disks ; planet-disk interaction ; stars: pre-main sequence ; stars: individual: MWC758
[en] Transition disks offer the extraordinary opportunity to look for newly born planets and investigate the early stages of planet formation. In this context we observed the Herbig A5 star MWC 758 with the L band vector vortex coronagraph installed in the near-infrared camera and spectrograph NIRC2 at the Keck II telescope, with the aim of unveiling the nature of the spiral structure by constraining the presence of planetary companions in the system. Our high-contrast imaging observations show a bright (delta L=7.0+/-0.3 mag) point-like emission, south of MWC 758 at a deprojected separation of about 20 au (r=0.111+/- 0. 004 arcsec) from the central star. We also recover the two spiral arms (south-east and north-west), already imaged by previous studies in polarized light, and discover a third one to the south-west of the star. No additional companions were detected in the system down to 5 Jupiter masses beyond 0.6 arcsec from the star. We propose that the bright L band emission could be caused by the presence of an embedded and accreting protoplanet, although the possibility of it being an asymmetric disk feature cannot be excluded. The spiral structure is probably not related to the protoplanet candidate, unless on an inclined and eccentric orbit, and it could be due to one (or more) yet undetected planetary companions at the edge of or outside the spiral pattern. Future observations and additional simulations will be needed to shed light on the true nature of the point-like source and its link with the spiral arms.
Space sciences, Technologies and Astrophysics Research - STAR
VORTEX
Researchers
http://hdl.handle.net/2268/218483
10.1051/0004-6361/201732016
http://adsabs.harvard.edu/abs/2018A%26A...611A..74R
https://www.aanda.org/articles/aa/abs/2018/03/aa32016-17/aa32016-17.html - Copyright ESO 2018, published by EDP Sciences
FP7 ; 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy

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