The surprising evolution of the shadow on the TW Hya disk

Abstract

We report new total intensity visible light high contrast imaging of the TW Hya disk taken with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST). This represents the first published images of the disk with STIS since 2016, when a moving shadow on the disk surface was reported. We continue to see the shadow moving in a counter-clockwise fashion, but in these new images the shadow has evolved into two separate shadows, implying a change in behavior for the occulting structure. Based on radiative transfer models of optically thick disk structures casting shadows, we infer that a plausible explanation for the change is that there are now two misaligned components of the inner disk. The first of these disks is located between 5-6au with an inclination of 5.5\arcdeg and PA of 170\arcdeg, the second between 6-7au with and inclination of 7\arcdeg and PA of 50\arcdeg. Finally, we speculate on the implications of the new shadow structure and determine that additional observations are needed to disentangle the nature of TW Hya's inner disk architecture.

arXiv comment20 pages, 9 figures, published in ApJ

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