Irregular dust features around intermediate-mass young stars with GPI: signs of youth or misaligned disks?

التفاصيل البيبلوغرافية
العنوان: Irregular dust features around intermediate-mass young stars with GPI: signs of youth or misaligned disks?
المؤلفون: Laws, Anna S. E., Harries, Tim J., Setterholm, Benjamin R., Monnier, John D., Rich, Evan A., Aarnio, Alicia N., Adams, Fred C., Andrews, Sean, Bae, Jaehan, Calvet, Nuria, Espaillat, Catherine, Hartmann, Lee, Hinkley, Sasha, Isella, Andrea, Kraus, Stefan, Wilner, David, Zhu, Zhaohuan
سنة النشر: 2019
المجموعة: Astrophysics
مصطلحات موضوعية: Astrophysics - Solar and Stellar Astrophysics
الوصف: We are undertaking a large survey of over thirty disks using the Gemini Planet Imager (GPI) to see whether the observed dust structures match spectral energy distribution (SED) predictions and have any correlation with stellar properties. GPI can observe near-infrared light scattered from dust in circumstellar environments using high-resolution Polarimetric Differential Imaging (PDI) with coronagraphy and adaptive optics. The data have been taken in J and H bands over two years, with inner working angles of 0.08'' and 0.11'' respectively. Ahead of the release of the complete survey results, here we present five objects with extended and irregular dust structures within 2'' of the central star. These objects are: FU Ori; MWC 789; HD 45677; Hen 3-365; and HD 139614. The observed structures are consistent with each object being a pre-main-sequence star with protoplanetary dust. The five objects' circumstellar environments could result from extreme youth and complex initial conditions, from asymmetric scattering patterns due to shadows cast by misaligned disks, or in some cases from interactions with companions. We see complex U_phi structures in most objects that could indicate multiple scattering or result from the illumination of companions. Specific key findings include the first high-contrast observation of MWC 789 revealing a newly-discovered companion candidate and arc, and two faint companion candidates around Hen 3-365. These two objects should be observed further to confirm whether the companion candidates are co-moving. Further observations and modeling are required to determine the causes of the structures.
نوع الوثيقة: Working Paper
DOI: 10.3847/1538-4357/ab59e2
URL الوصول: http://arxiv.org/abs/1911.04214
رقم الأكسشن: edsarx.1911.04214
قاعدة البيانات: arXiv
الوصف
DOI:10.3847/1538-4357/ab59e2