تقرير
Ring Gap Structure around Class I Protostar WL 17
| العنوان: | Ring Gap Structure around Class I Protostar WL 17 |
|---|---|
| المؤلفون: | Shoshi, Ayumu, Harada, Naoto, Tokuda, Kazuki, Kawasaki, Yoshihiro, Yamasaki, Hayao, Sato, Asako, Omura, Mitsuki, Yamaguchi, Masayuki, Tachihara, Kengo, Machida, Masahiro N. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | WL 17 is a Class I object and was considered to have a ring-hole structure. We analyzed the structure around WL 17 to investigate the detailed properties of WL 17. We used ALMA archival data, which have a higher angular resolution than previous observations. We investigated the WL 17 system with the 1.3 mm dust continuum and 12CO and C18O (J = 2-1) line emissions. The dust continuum emission showed a clear ring structure with inner and outer edges of ~11 and ~21 au, respectively. In addition, we detected an inner disk of < 5 au radius enclosing the central star within the ring, the first observation of this structure. Thus, WL 17 has a ring-gap structure, not a ring-hole structure. We did not detect any marked emission in either the gap or inner disk, indicating that there is no sign of a planet, circumplanetary disk, or binary companion. We identified the base of both blue-shifted and red-shifted outflows based on the 12CO emission, which is clearly associated with the disk around WL 17. The outflow mass ejection rate is ~3.6x10^-7 Msun yr-1 and the dynamical timescale is as short as ~ 10^4 yr. The C18O emission showed that an inhomogeneous infalling envelope, which can induce episodic mass accretion, is distributed in the region within ~1000 au from the central protostar. With these new findings, we can constrain the planet formation and dust growth scenarios in the accretion phase of star formation. Comment: 22 pages, 9 figures, Accepted for publication in the Astrophysical Journal |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2312.02504 |
| رقم الأكسشن: | edsarx.2312.02504 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |