| Autor: |
Ruane, G., Mawet, D., Kastner, J., Meshkat, T., Bottom, M., Castellá, B. Femenía, Absil, O., Gonzalez, C. Gomez, Huby, E., Zhu, Z., Jensen-Clem, R., Choquet, É., Serabyn, E. |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
The Astronomical Journal 154, 73 (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.3847/1538-3881/aa7b81 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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