Near-infrared imaging polarimetry of LkCa 15: A possible warped inner disk

Oh, Daehyeon; Hashimoto, Jun; Tamura, Motohide; Wisniewski, John; Akiyama, Eiji; Currie, Thayne; Mayama, Satoshi; Takami, Michihiro; Thalmann, Christian; Kudo, Tomoyuki; Kusakabe, Nobuhiko; Abe, Lyu; Brandner, Wolfgang; Brandt, Timothy D.; Carson, Joseph C.; Egner, Sebastian; Feldt, Markus; Goto, Miwa; Grady, Carol A.; Guyon, Olivier; Hayano, Yutaka; Hayashi, Masahiko; Hayashi, Saeko S.; Henning, Thomas; Hodapp, Klaus W.; Ishii, Miki; Iye, Masanori; Janson, Markus; Kandori, Ryo; Knapp, Gillian R.; Kuzuhara, Masayuki; Kwon, Jungmi; Matsuo, Taro; McElwain, Michael W.; Miyama, Shoken; Morino, Jun-Ichi; Moro-Martin, Amaya; Nishimura, Tetsuo; Pyo, Tae-Soo; Serabyn, Eugene; Suenaga, Takuya; Suto, Hiroshi; Suzuki, Ryuji; Takahashi, Yasuhiro H.; Takato, Naruhisa; Terada, Hiroshi; Turner, Edwin L.; Watanabe, Makoto; Yamada, Toru; Takami, Hideki und Usuda, Tomonori (2016): Near-infrared imaging polarimetry of LkCa 15: A possible warped inner disk. In: Publications of the Astronomical Society of Japan, Bd. 68, Nr. 2, L3

Abstract

We present high-contrast H-band polarized intensity images of the transitional disk around the young solar-like star LkCa 15. By utilizing Subaru/HiCIAO for polarimetric differential imaging, the angular resolution and the inner working angle reach 0.'' 07 and r = 0.'' 1, respectively. We obtained a clearly resolved gap (width less than or similar to 27 au) at similar to 48 au from the central star. This gap is consistent with images reported in previous studies. We also confirmed the existence of a bright inner disk with a misaligned position angle of 13 degrees +/- 4 degrees with respect to that of the outer disk, i. e., the inner disk is possibly warped. The large gap and the warped inner disk both point to the existence of a multiple planetary system with a mass of less than or similar to 1 M-Jup.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-6264
• Sprache: Englisch