تقرير
A Dust Trap in the Young Multiple System HD 34700
| العنوان: | A Dust Trap in the Young Multiple System HD 34700 |
|---|---|
| المؤلفون: | Benac, Peyton, Matra, Luca, Wilner, David J., Jimenez-Donaire, Maria J., Monnier, John D., Rich, Evan A., Harries, Tim J., Laws, Anna, Zhang, Qizhou |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | Millimeter observations of disks around young stars reveal substructures indicative of gas pressure traps that may aid grain growth and planet formation. We present Submillimeter Array observations of HD 34700- two Herbig Ae stars in a close binary system (Aa/Ab, $\sim$0.25 AU), surrounded by a disk presenting a large cavity and spiral arms seen in scattered light, and two distant, lower mass companions. These observations include 1.3 mm continuum emission and the $^{12}$CO 2-1 line at $\sim0.5$" (178 AU) resolution. They resolve a prominent azimuthal asymmetry in the continuum, and Keplerian rotation of a circumbinary disk in the $^{12}$CO line. The asymmetry is located at a radius of $155^{+11}_{-7}$ AU, consistent with the edge of the scattered light cavity, being resolved in both radius ($72 ^{+14}_{-15}$ AU) and azimuth (FWHM = $64 ^{\circ +8}_{-7}$). The strong asymmetry in millimeter continuum emission could be evidence for a dust trap, together with the more symmetric morphology of $^{12}$CO emission and small grains. We hypothesize an unseen circumbinary companion, responsible for the cavity in scattered light and creating a vortex at the cavity edge that manifests in dust trapping. The disk mass has limitations imposed by the detection of $^{12}$CO and non-detection of $^{13}$CO. We discuss its consequences for the potential past gravitational instability of this system, likely accounting for the rapid formation of a circumbinary companion. We also report the discovery of resolved continuum emission associated with HD 34700B (projected separation $\sim1850$AU), which we explain through a circumstellar disk. Comment: 12 pages, 5 figures, accepted to ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/abc74b |
| URL الوصول: | http://arxiv.org/abs/2011.03489 |
| رقم الأكسشن: | edsarx.2011.03489 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/abc74b |
|---|