SUBARU IMAGING OF ASYMMETRIC FEATURES IN A TRANSITIONAL DISK IN UPPER SCORPIUS

We report high-resolution (0.07 arcsec) near-infrared polarized intensity images of the circumstellar disk around the star 2MASS J16042165−2130284 obtained with HiCIAO mounted on the Subaru 8.2 m telescope. We present our H-band data, which clearly exhibit a resolved, face-on disk with a large inner hole for the first time at infrared wavelengths. We detect the centrosymmetric polarization pattern in the circumstellar material as has been observed in other disks. Elliptical fitting gives the semimajor axis, semiminor axis, and position angle (P.A.) of the disk as 63 AU, 62 AU, and −14°, respectively. The disk is asymmetric, with one dip located at P.A.s of ∼85°. Our observed disk size agrees well with a previous study of dust and CO emission at submillimeter wavelength with Submillimeter Array. Hence, the near-infrared light is interpreted as scattered light reflected from the inner edge of the disk. Our observations also detect an elongated arc (50 AU) extending over the disk inner hole. It emanates at the inner edge of the western side of the disk, extending inward first, then curving to the northeast. We discuss the possibility that the inner hole, the dip, and the arc that we have observed may be related to the existence of unseen bodies within the disk.

[1]  Jonathan P. Williams,et al.  880 μm IMAGING OF A TRANSITIONAL DISK IN UPPER SCORPIUS: HOLDOVER FROM THE ERA OF GIANT PLANET FORMATION? , 2012, 1205.3545.

[2]  B. Zuckerman,et al.  NEW MEMBERS OF THE SCORPIUS-CENTAURUS COMPLEX AND AGES OF ITS SUB-REGIONS , 2012, 1204.5715.

[3]  O. Guyon,et al.  THE MISSING CAVITIES IN THE SEEDS POLARIZED SCATTERED LIGHT IMAGES OF TRANSITIONAL PROTOPLANETARY DISKS: A GENERIC DISK MODEL , 2012, 1203.1612.

[4]  C. A. Grady,et al.  DISCOVERY OF SMALL-SCALE SPIRAL STRUCTURES IN THE DISK OF SAO 206462 (HD 135344B): IMPLICATIONS FOR THE PHYSICAL STATE OF THE DISK FROM SPIRAL DENSITY WAVE THEORY , 2012, 1202.6139.

[5]  K. Flaherty,et al.  INFRARED VARIABILITY OF EVOLVED PROTOPLANETARY DISKS: EVIDENCE FOR SCALE HEIGHT VARIATIONS IN THE INNER DISK , 2012, 1202.1553.

[6]  Jonathan P. Williams,et al.  THE LATE STAGES OF PROTOPLANETARY DISK EVOLUTION: A MILLIMETER SURVEY OF UPPER SCORPIUS , 2011, 1111.0101.

[7]  Mark J. Pecaut,et al.  A REVISED AGE FOR UPPER SCORPIUS AND THE STAR FORMATION HISTORY AMONG THE F-TYPE MEMBERS OF THE SCORPIUS–CENTAURUS OB ASSOCIATION , 2011, 1112.1695.

[8]  T. Muto.  THE STRUCTURE OF A SELF-GRAVITATING PROTOPLANETARY DISK AND ITS IMPLICATIONS FOR DIRECT IMAGING OBSERVATIONS , 2011, 1106.5224.

[9]  Catherine Espaillat,et al.  RESOLVED IMAGES OF LARGE CAVITIES IN PROTOPLANETARY TRANSITION DISKS , 2011, 1103.0284.

[10]  J. Bochanski,et al.  DISCOVERY OF A CANDIDATE FOR THE COOLEST KNOWN BROWN DWARF , 2011, 1102.5411.

[11]  E. Kokubo,et al.  DIRECT IMAGING OF FINE STRUCTURES IN GIANT PLANET-FORMING REGIONS OF THE PROTOPLANETARY DISK AROUND AB AURIGAE , 2011, 1102.4408.

[12]  Catherine Espaillat,et al.  TRANSITIONAL AND PRE-TRANSITIONAL DISKS: GAP OPENING BY MULTIPLE PLANETS? , 2010, 1012.4395.

[13]  J. Muzerolle,et al.  A SPITZER IRS STUDY OF INFRARED VARIABILITY IN TRANSITIONAL AND PRE-TRANSITIONAL DISKS AROUND T TAURI STARS , 2010, 1012.3500.

[14]  Frantz Martinache,et al.  TWO WIDE PLANETARY-MASS COMPANIONS TO SOLAR-TYPE STARS IN UPPER SCORPIUS , 2010, 1011.2201.

[15]  Olivier Guyon,et al.  Commissioning status of Subaru laser guide star adaptive optics system , 2010, Astronomical Telescopes + Instrumentation.

[16]  Paul M. Harvey,et al.  THE NATURE OF TRANSITION CIRCUMSTELLAR DISKS. I. THE OPHIUCHUS MOLECULAR CLOUD , 2010, 1001.4825.

[17]  L. Allen,et al.  A SPITZER CENSUS OF TRANSITIONAL PROTOPLANETARY DISKS WITH AU-SCALE INNER HOLES , 2009, 0911.2704.

[18]  Paul S. Smith,et al.  EVIDENCE FOR DYNAMICAL CHANGES IN A TRANSITIONAL PROTOPLANETARY DISK WITH MID-INFRARED VARIABILITY , 2009, 0909.5201.

[19]  M. Meyer,et al.  DEBRIS DISKS IN THE UPPER SCORPIUS OB ASSOCIATION , 2009, 0909.4124.

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

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

[22]  H. Jang-Condell.  PLANET SHADOWS IN PROTOPLANETARY DISKS. II. OBSERVABLE SIGNATURES , 2009, 0906.1375.

[23]  Sean M. Andrews,et al.  PROTOPLANETARY DISK STRUCTURES IN OPHIUCHUS , 2009, 0906.0730.

[24]  J. Carpenter,et al.  SPITZER SPECTROSCOPY OF CIRCUMSTELLAR DISKS IN THE 5 Myr OLD UPPER SCORPIUS OB ASSOCIATION , 2009, 0901.4120.

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

[26]  Christian Thalmann,et al.  Reduction of polarimetric data using Mueller calculus applied to Nasmyth instruments , 2008, Astronomical Telescopes + Instrumentation.

[27]  Spitzer Science Center,et al.  The HD 163296 Circumstellar Disk in Scattered Light: Evidence of Time-Variable Self-Shadowing , 2008, 0807.1766.

[28]  Frantz Martinache,et al.  Mapping the Shores of the Brown Dwarf Desert. I. Upper Scorpius , 2008 .

[29]  J. Pety,et al.  Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths , 2006, astro-ph/0610200.

[30]  Ithaca,et al.  A Survey and Analysis of Spitzer Infrared Spectrograph Spectra of T Tauri Stars in Taurus , 2006, astro-ph/0608038.

[31]  Shane Jacobson,et al.  Design of the HiCIAO instrument for the Subaru Telescope , 2006, SPIE Astronomical Telescopes + Instrumentation.

[32]  Saeko S. Hayashi,et al.  Near-Infrared Images of Protoplanetary Disk Surrounding HD 142527 , 2006 .

[33]  A. Morbidelli,et al.  On the width and shape of gaps in protoplanetary disks , 2006 .

[34]  Sabine Frink,et al.  The History of Low-Mass Star Formation in the Upper Scorpius OB Association , 1999 .

[35]  D. Lin,et al.  Gap Formation in Protoplanetary Disks , 1996 .

[36]  L. Hartmann,et al.  Pre-Main-Sequence Evolution in the Taurus-Auriga Molecular Cloud , 1995 .

[37]  Michael F. Skrutskie,et al.  Circumstellar Material Associated with Solar-Type Pre-Main-Sequence Stars: A Possible Constraint on the Timescale for Planet Building , 1989 .

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