Article (Scientific journals)
Deep imaging search for planets forming in the TW Hya protoplanetary disk with the Keck/NIRC2 vortex coronagraph
Ruane, G.; Mawet, D.; Kastner, J. et al.
2017In Astronomical Journal, 154, p. 73
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Keywords :
stars: individual (TW Hya); circumstellar matter; stars: pre-main sequence
Abstract :
[en] Distinct gap features in the nearest protoplanetary disk, TW Hya (distance of 59.5$\pm$0.9 pc), may be signposts of ongoing planet formation. We performed long-exposure thermal infrared coronagraphic imaging observations to search for accreting planets especially within dust gaps previously detected in scattered light and submm-wave thermal emission. Three nights of observations with the Keck/NIRC2 vortex coronagraph in $L^\prime$ (3.4-4.1$\mu$m) did not reveal any statistically significant point sources. We thereby set strict upper limits on the masses of non-accreting planets. In the four most prominent disk gaps at 24, 41, 47, and 88 au, we obtain upper mass limits of 1.6-2.3, 1.1-1.6, 1.1-1.5, and 1.0-1.2 Jupiter masses ($M_J$) assuming an age range of 7-10 Myr for TW Hya. These limits correspond to the contrast at 95\% completeness (true positive fraction of 0.95) with a 1\% chance of a false positive within $1^{\prime\prime}$ of the star. We also approximate an upper limit on the product of planet mass and planetary accretion rate of $M_p\dot{M}\lesssim10^{-8} M_J^2/yr$ implying that any putative $\sim0.1 M_J$ planet, which could be responsible for opening the 24 au gap, is presently accreting at rates insufficient to build up a Jupiter mass within TW Hya's pre-main sequence lifetime.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ruane, G.
Mawet, D.
Kastner, J.
Meshkat, T.
Bottom, M.
Femenía Castellá, B.
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Gómez González, Carlos ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Huby, Elsa ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Zhu, Z.
Jenson-Clem, R.
Choquet, É.
Serabyn, E.
More authors (3 more) Less
Language :
English
Title :
Deep imaging search for planets forming in the TW Hya protoplanetary disk with the Keck/NIRC2 vortex coronagraph
Publication date :
27 July 2017
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
Institute of Physics (IoP)
Volume :
154
Pages :
73
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Name of the research project :
VORTEX
Funders :
CE - Commission Européenne [BE]
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