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Jets, Disks, and Cavities: The Protoplanetary Zoo in 2006

Jets, Disks, and Cavities: The Protoplanetary Zoo in 2006. C. Grady. Coronagraphic Imaging Surveys. On-going effort to obtain coronagraphic imagery with supporting narrow-band coronagraphic imagery (GFP), FUV spectra (FUSE, HST), x-ray data (Chandra)

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Jets, Disks, and Cavities: The Protoplanetary Zoo in 2006

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  1. Jets, Disks, and Cavities: The Protoplanetary Zoo in 2006 C. Grady

  2. Coronagraphic Imaging Surveys • On-going effort to obtain coronagraphic imagery with supporting narrow-band coronagraphic imagery (GFP), FUV spectra (FUSE, HST), x-ray data (Chandra) • Goal is to understand, for more isolated systesm at what point central clearing is remotely detectable.

  3. Jets and Accretion • Now have 6, optically visible Herbig Ae stars with jets or HH knots • Detection fraction is similar to T Tauri stars • Age range spans 0.7-7 Myr • None seen in the ZAMS objects

  4. Disks with Central Dust Deficits • 4 Herbig Ae Stars • 4 T Tauri stars • Herbig Ae stars include one object with comet-like dust (HD 100546), and 3 lacking warm silicate emission. • HD 100546 has no jet, and possesses an eccentric 13 AU radius cavity. Is this typical? • The 4 stars have been modelled as ZAMS objects, but a potentially related one (HD 141569 A) is more correctly a factor of 2 (5 Myr) younger. Is this typical?

  5. HD 169142 • A5Ve star (in the optical), A8Ve (in the UV) at d=145 pc • Abundant mm dust emission, with disk imaged to 1.6” (230 AU; Dent et al. 2005; Raman et al. 2006) • 13° inclination (Raman et al. 2006) • v sin i=55 (Dunkin et al. 1997), implying that veq=240 km/s - later A-type analog of Vega (Aufdenberg 2005)

  6. Disk in NIR Scattered Light HD 169142 Visit2 HD 169142 Visit 1 PSF-PSF • Disk is azimuthally symmetric • NICMOS traces disk to 1.3” • Radial surface brightness goes as r-3 , implying r-1.

  7. The Environment HD 169142 Visit 1 HD 169142 Visit2 • Unlike HD 100546, HD 169142 has an object 8” SW of the Herbig Ae star with NIR colors appropriate for an M Star. • Object is an H emitter (GFP data).

  8. HD 169142B HD 169142 Visit2 • Companion is common proper motion since 1980s, and is M2.5Ve.

  9. Age Estimate • Companion is double as seen by HST. • Using F110W magnitudes, d=145 pc, and Teff from the optical spectra, we can locate the brighter star in the HR diagram: coeval with HR 4796 A, at about 8± 4 Myr.

  10. Conclusions and Speculations • All 4 stars (HD 100546, HD 135344, HD 139614, and HD 169142) have veq>200 km/s. • Two of the 4 (HD 135344, Thi et al. 2001; HD 169142, this study) have estimated ages in the 8-16 Myr range. The other 2 are ZAMS from their location in the HR diagram. • Central clearing in these systems seems to be a process which occurs comparatively late in the history of the disk. For HD 100546 a second body is implicated (Grady et al. 2005) , despite the underabundance of iron and siderophiles in both the star and the infalling material (Grady et al. 1997). • May have stumbled onto a population of planetary systems with architechtures which differ from the bulk of the extra-solar systems. Astrometric follow-up is needed (SIM), as is higher angular resolution imagery.

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