DISCOVERY OF A TWO-ARMED SPIRAL STRUCTURE IN THE GAPPED DISK AROUND HERBIG Ae STAR HD 100453

作者：Wagner Kevin; Apai Daniel; Kasper Markus; Robberto Massimo

来源：Astrophysical Journal Letters, 2015, 813(1): L2.

DOI：10.1088/2041-8205/813/1/L2

• planet-disk interactions
• planetary systems
• protoplanetary disks
• stars: individual (HD 100453)
• stars: variables: T Tauri, Herbig Ae/Be

We present Very Large Telescope (VLT)/SPHERE adaptive optics imaging in the Y-, J-, H-, and K-bands of the HD 100453 system and the discovery of a two-armed spiral structure in a disk extending to 0 ''.37 (similar to 42 AU) from the star, with highly symmetric arms to the northeast and southwest. Inside of the spiral arms, we resolve a ring of emission from 0 ''.18 to 0 ''.25 (similar to 21-29 AU). By assuming that the ring is intrinsically circular we estimate an inclination of similar to 34 degrees from face on. We detect dark crescents on opposite sides (NW and SE) that begin at 0 ''.18 and continue to radii smaller than our inner working angle of 0 ''.15, which we interpret as the signature of a gap at less than or similar to 21 AU that has likely been cleared by forming planets. We also detect the similar to 120 AU companion HD 100453 B, and by comparing our data to 2003 Hubble Space Telescope and VLT/NACO images we estimate an orbital period of similar to 850 year. We discuss what implications the discovery of the spiral arms and finer structures of the disk may have on our understanding of the possible planetary system in HD 100453 and how the morphology of this disk compares to other related objects.

• 出版日期2015-11-1