Imaging the disc rim and a moving close-in companion candidate in the pre-transitional disc of V1247 Orionis. (arXiv:1811.06880v1 [astro-ph.SR])

Imaging the disc rim and a moving close-in companion candidate in the pre-transitional disc of V1247 Orionis. (arXiv:1811.06880v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Willson_M/0/1/0/all/0/1">Matthew Willson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kraus_S/0/1/0/all/0/1">Stefan Kraus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kluska_J/0/1/0/all/0/1">Jacques Kluska</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Monnier_J/0/1/0/all/0/1">John D. Monnier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cure_M/0/1/0/all/0/1">Michel Cure</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sitko_M/0/1/0/all/0/1">Mike Sitko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Aarnio_A/0/1/0/all/0/1">Alicia Aarnio</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ireland_M/0/1/0/all/0/1">Michael J. Ireland</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rizzuto_A/0/1/0/all/0/1">Aaron Rizzuto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hone_E/0/1/0/all/0/1">Edward Hone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kreplin_A/0/1/0/all/0/1">Alexander Kreplin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Andrews_S/0/1/0/all/0/1">Sean Andrews</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Calvet_N/0/1/0/all/0/1">Nuria Calvet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Espaillat_C/0/1/0/all/0/1">Catherine Espaillat</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fukagawa_M/0/1/0/all/0/1">Misato Fukagawa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Harries_T/0/1/0/all/0/1">Tim J. Harries</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hinkley_S/0/1/0/all/0/1">Sasha Hinkley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kanaan_S/0/1/0/all/0/1">Samer Kanaan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Muto_T/0/1/0/all/0/1">Takayuki Muto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wilner_D/0/1/0/all/0/1">David J. Wilner</a>

V1247 Orionis harbours a pre-transitional disc with a partially cleared gap.
Earlier interferometric and polarimetric observations revealed strong
asymmetries both in the gap region and in the outer disc. The presence of a
companion was inferred to explain these asymmetric structures and the ongoing
disc clearing. Using an extensive set of multi-wavelength and multi-epoch
observations we aimed to identify the origin of the previously detected
asymmetries. We have observed V1247 Ori at three epochs spanning $sim678$ days
using sparse aperture masking interferometry with Keck/NIRC2 and VLT/NACO. In
addition, we search for signs of accretion through VLT/SPHERE-ZIMPOL spectral
differential imaging in H$alpha$ and R-band continuum. Our SMA sub-millimetre
interferometry in 880 $mu$m continuum and in the CO(3-2) line allows us to
constrain the orientation and direction of rotation of the outer disc. We find
the L’-band emission to be dominated by static features which trace
forward-scattered dust emission from the inner edge of the outer disc located
to the north-east. In H- and K-band, we see evidence for a companion candidate
that moved systematically by 45$^{circ}$ within the first $sim$345 days. The
separation of the companion candidate is not well constrained, but the observed
position angle change is consistent with Keplerian motion of a body located on
a 6 au orbit. From the SMA CO moment map, the location of the disc rim, and the
detected orbital motion, we deduced the three-dimensional orientation of the
disc. We see no indication of accretion in H$alpha$ and set upper limits for
an accreting companion. The measured contrast of the companion candidate in H
and K is consistent with an actively accreting protoplanet. Hence, we identify
V1247 Ori as a unique laboratory for studying companion-disc interactions and
disc clearing.

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