OPTICAL IMAGING POLARIMETRY of the LkCa 15 PROTOPLANETARY DISK with SPHERE ZIMPOL

C. Thalmann, G. D. Mulders, M. Janson, J. Olofsson, M. Benisty, H. Avenhaus, S. P. Quanz, H. M. Schmid, T. Henning, E. Buenzli, F. Ménard, J. C. Carson, A. Garufi, S. Messina, C. Dominik, J. Leisenring, G. Chauvin, M. R. Meyer

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

We present the first optical (590-890 nm) imaging polarimetry observations of the pre-transitional protoplanetary disk around the young solar analog LkCa 15, addressing a number of open questions raised by previous studies. We detect the previously unseen far side of the disk gap, confirming the highly off-centered scattered-light gap shape that was postulated from near-infrared imaging, at odds with the symmetric gap inferred from millimeter interferometry. Furthermore, we resolve the inner disk for the first time and trace it out to 30 AU. This new source of scattered light may contribute to the near-infrared interferometric signal attributed to the protoplanet candidate LkCa 15 b, which lies embedded in the outer regions of the inner disk. Finally, we present a new model for the system architecture of LkCa 15 that ties these new findings together. These observations were taken during science verification of SPHERE ZIMPOL and demonstrate this facility's performance for faint guide stars under adverse observing conditions.

Original languageEnglish (US)
Article numberL41
JournalAstrophysical Journal Letters
Volume808
Issue number2
DOIs
StatePublished - Aug 1 2015
Externally publishedYes

Keywords

  • circumstellar matter
  • planets and satellites: formation
  • protoplanetary disks
  • stars: individual(LkCa 15)
  • stars: pre-main sequence
  • techniques: high angular resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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