تقرير
High-contrast imaging of HD 163296 with the Keck/NIRC2 L'-band vortex coronograph
| العنوان: | High-contrast imaging of HD 163296 with the Keck/NIRC2 L'-band vortex coronograph |
|---|---|
| المؤلفون: | Guidi, G., Ruane, G., Williams, J. P., Mawet, D., Testi, L., Zurlo, A., Absil, O., Bottom, M., Choquet, E., Christiaens, V., Castellá, B. Femenía, Huby, E., Isella, A., Kastner, J., Meshkat, T., Reggiani, M., Riggs, A., Serabyn, E., Wallack, N. |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We present observations of the nearby (D$\sim$100\,pc) Herbig star HD~163296 taken with the vortex coronograph at Keck/NIRC2 in the L' band (3.7~$\mu$m), to search for planetary mass companions in the ringed disc surrounding this pre-main sequence star. The images reveal an arc-like region of scattered light from the disc surface layers that is likely associated with the first bright ring detected with ALMA in the $\lambda$=1.3mm dust continuum at $\sim$65~au. We also detect a point-like source at $\sim$0\farcs5 projected separation in the North-East direction, close to the inner edge of the second gap in the millimetre images. Comparing the point source photometry with the atmospheric emission models of non-accreting giant planets, we obtain a mass of 6--7~M$_J$ for a putative protoplanet, assuming a system age of 5~Myr. Based on the contrast at a 95\% level of completeness calculated on the emission-free regions of our images, we set upper limits for the masses of giant planets of 8--15~M$_J$, 4.5--6.5~M$_J$ and 2.5-4.0~M$_J$ at the locations of the first, second and third gap in the millimetre dust continuum, respectively. Further deep, high resolution thermal IR imaging of the HD~163296 system are warranted, to confirm the presence and nature of the point source and to better understand the structure of the dust disc. Comment: 9 pages, 6 figures. Accepted by MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/sty1642 |
| URL الوصول: | http://arxiv.org/abs/1806.08263 |
| رقم الأكسشن: | edsarx.1806.08263 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/sty1642 |
|---|