DIRECT IMAGING OF FINE STRUCTURES IN GIANT PLANET-FORMING REGIONS OF THE PROTOPLANETARY DISK AROUND AB AURIGAE

We report high-resolution 1.6 μm polarized intensity (PI) images of the circumstellar disk around the Herbig Ae star AB Aur at a radial distance of 22 AU (015) up to 554 AU (385), which have been obtained by the high-contrast instrument HiCIAO with the dual-beam polarimetry. We revealed complicated and asymmetrical structures in the inner part (140 AU) of the disk while confirming the previously reported outer (r 200 AU) spiral structure. We have imaged a double ring structure at ~40 and ~100 AU and a ring-like gap between the two. We found a significant discrepancy of inclination angles between two rings, which may indicate that the disk of AB Aur is warped. Furthermore, we found seven dips (the typical size is ~45 AU or less) within two rings, as well as three prominent PI peaks at ~40 AU. The observed structures, including a bumpy double ring, a ring-like gap, and a warped disk in the innermost regions, provide essential information for understanding the formation mechanism of recently detected wide-orbit (r > 20 AU) planets.

[1]  Justin R. Crepp,et al.  FORMATION, SURVIVAL, AND DETECTABILITY OF PLANETS BEYOND 100 AU , 2009, 0902.2779.

[2]  S. Inutsuka,et al.  PROTOPLANETARY DISK WINDS VIA MAGNETOROTATIONAL INSTABILITY: FORMATION OF AN INNER HOLE AND A CRUCIAL ASSIST FOR PLANET FORMATION , 2009, 0911.0311.

[3]  P. H. Hauschildt,et al.  Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458 , 2003 .

[4]  Olivier Guyon,et al.  Design of laser system for Subaru LGS AO , 2004, SPIE Astronomical Telescopes + Instrumentation.

[5]  Pierre-Olivier Lagage,et al.  Anatomy of a Flaring Proto-Planetary Disk Around a Young Intermediate-Mass Star , 2006, Science.

[6]  Sub-arcsec imaging of the AB Aur molecular disk and envelope at millimeter wavelengths: a non Keplerian disk , 2005, astro-ph/0504023.

[7]  CfAO,et al.  SPECKLE SUPPRESSION THROUGH DUAL IMAGING POLARIMETRY, AND A GROUND-BASED IMAGE OF THE HR 4796A CIRCUMSTELLAR DISK , 2009, 0906.3010.

[8]  Mark Clampin,et al.  Hubble Space Telescope Space Telescope Imaging Spectrograph Coronagraphic Imaging of the Herbig Ae Star AB Aurigae , 1999 .

[9]  Radiative Transfer Models of a Possible Planet in the AB Aurigae Disk , 2010, 1003.3900.

[10]  P. Ho,et al.  Possible Molecular Spiral Arms in the Protoplanetary Disk of AB Aurigae , 2006, astro-ph/0603414.

[11]  Disk eccentricity and embedded planets , 2005, astro-ph/0510393.

[12]  Boeing,et al.  The Solar-System-Scale Disk around AB Aurigae , 2008, 0803.3629.

[13]  Belgium,et al.  The origin of crystalline silicates in the Herbig Be star HD 100546 and in comet Hale-Bopp , 2003, astro-ph/0301254.

[14]  Motohide Tamura,et al.  Subaru Strategic Exploration of Exoplanets and Disks with HiCIAO/AO188 (SEEDS) , 2009 .

[15]  J. Papaloizou,et al.  Three-dimensional Magnetohydrodynamic Simulations of an Accretion Disk with Star-Disk Boundary Layer , 2002, astro-ph/0201479.

[16]  Saeko S. Hayashi,et al.  Spiral Structure in the Circumstellar Disk around AB Aurigae , 2004 .

[17]  S. Inutsuka,et al.  EMERGENCE OF PROTOPLANETARY DISKS AND SUCCESSIVE FORMATION OF GASEOUS PLANETS BY GRAVITATIONAL INSTABILITY , 2009, 0912.5439.

[18]  Glenn Schneider,et al.  THE CASE OF AB AURIGAE’S DISK IN POLARIZED LIGHT: IS THERE TRULY A GAP? , 2009, 0911.1130.

[19]  F. Adams,et al.  Star Formation in Molecular Clouds: Observation and Theory , 1987 .

[20]  E. Guinan,et al.  Intrinsic Properties of the Young Stellar Object SU Aurigae , 2003 .

[21]  D. Mouillet,et al.  A planet on an inclined orbit as an explanation of the warp in the β Pictoris disc , 1997 .

[22]  Jack J. Lissauer,et al.  Formation of the Giant Planets by Concurrent Accretion of Solids and Gas , 1995 .

[23]  S. Tremaine,et al.  The excitation of density waves at the Lindblad and corotation resonances by an external potential. , 1979 .

[24]  Subaru Telescope,et al.  DISCOVERY OF THE COLDEST IMAGED COMPANION OF A SUN-LIKE STAR , 2009, 0911.1127.

[25]  William R. Ward,et al.  Three-Dimensional Interaction between a Planet and an Isothermal Gaseous Disk. I. Corotation and Lindblad Torques and Planet Migration , 2002 .

[26]  Laird M. Close,et al.  Adaptive Optics Infrared Imaging Polarimetry and Optical HST Imaging of Hubble's Variable Nebula (R Monocerotis/NGC 2261): A Close Look at a Very Young Active Herbig Ae/Be Star , 1997 .

[27]  H. Kataza,et al.  PRE-TRANSITIONAL DISK NATURE OF THE AB Aur DISK , 2010, 1007.0807.

[28]  J. Hawley,et al.  Instability, turbulence, and enhanced transport in accretion disks , 1997 .

[29]  Miki Ishii,et al.  EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY , 2009 .

[30]  Mark Clampin,et al.  Optical Images of an Exosolar Planet 25 Light-Years from Earth , 2008, Science.

[31]  B. Macintosh,et al.  Direct Imaging of Multiple Planets Orbiting the Star HR 8799 , 2008, Science.

[32]  Steven V. W. Beckwith,et al.  Circumstellar disks and the search for neighbouring planetary systems , 1996, Nature.

[33]  D. Lin,et al.  On the tidal interaction between protoplanets and the primordial solar nebula. II: Self-consistent nonlinear interaction , 1986 .

[34]  C. A. Grady,et al.  NEAR-INFRARED MULTI-BAND PHOTOMETRY OF THE SUBSTELLAR COMPANION GJ 758 B , 2010, 1011.5505.