1 / 21

A Molecular Inventory of the L1489 IRS Protoplanetary Disk

A Molecular Inventory of the L1489 IRS Protoplanetary Disk. Michiel R. Hogerheijde Christian Brinch Leiden Observatory Jes K. J oergensen CfA. Origin of Protoplanetary Disks. It’s the angular momentum, stupid Initial distribution of angular momentum

reed-gamble
Download Presentation

A Molecular Inventory of the L1489 IRS Protoplanetary Disk

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. A Molecular Inventory of the L1489 IRS Protoplanetary Disk Michiel R. Hogerheijde Christian Brinch Leiden Observatory Jes K. Joergensen CfA

  2. Origin of Protoplanetary Disks • It’s the angular momentum, stupid • Initial distribution of angular momentum • E.g., Goodman et al. 1998; Ohashi et al. 1997; Belloche et al. 2002 • Redistribution during collapse • Formation of a viscous disk • Mass, size, evolution with time, accretion shock • E.g., Stahler 1994; Velusamy et al. 2002 Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  3. L1489 IRS: A Transitional Object? • Compact dust continuum • 2000 AU radius • Density: radial power law with slope 1.8–2.1 • Mass 0.01–0.02 M • Hogerheijde & Sandell 2000; Joergensen et al. 2002 • Neighboring prestellar core SCUBA 850 and 450 µm observations from Hogerheijde & Sandell (2000) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  4. L1489 IRS: A Transitional Object? • Single-dish HCO+ lines • infall • Interferometer HCO+ image • Rotation • Hogerheijde (2001) • CO 4.5 µm absorption lines • Inward motions continue to within 0.1 AU from star • Boogert et al. (2002) Hogerheijde (2001) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  5. L1489 IRS: A Transitional Object? HCO+ 3–2 @ 1.1mm BIMA 2000 • Single-dish HCO+ lines • infall • Interferometer HCO+ image • Rotation • Hogerheijde (2001) • CO 4.5 µm absorption lines • Inward motions continue to within 0.1 AU from star • Boogert et al. (2002) Hogerheijde (2001) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  6. L1489 IRS: A Transitional Object? • NICMOS scattered light suggests flared disk • Padgett et al. (1998) • Simple model • Flared disk • 10% infall, 90% rotation • Hogerheijde (2001) • Transitional, short-lived (2x104 yr) stage between embedded and T Tauri phase? NICMOS image from Padgett et al. (1998) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  7. Molecular Line Survey • Single-dish molecular line measurements • JCMT, IRAM 30m, and Onsala 20m: 14”–38” = 2000–5500 AU • C17O 1–0, 2–1, 3–2 • C18O 1–0, 2–1, 3–2 • CS 2–1, 5–4, 7–6 • C34S 2–1, 5–4 • HCO+ 1–0, 3–2, 4–3 • H13CO+ 1–0, 3–2 • CN 1–0, 3–2 • HCN 1–0, 4–3 • H13CN 1–0 • HNC 4–3 • Aims • More realistic model • Chemical inventory Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  8. Modeling Approach • Physical model: density • Flattened Plummer sphere • Consistent with SCUBA data • p=1.8 (Joergensen et al. 2002) • (Joergensen et al. 2002) Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  9. Modeling Approach • Physical model: density • Flattened Plummer sphere • Consistent with SCUBA data • p=1.8 (Joergensen et al. 2002) • f>0 Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  10. Modeling Approach V • Velocity field • Rotation V √M* r-0.5 • Infall Vr √M* r-0.5 • Parameterize V-field by • |V|√M* r-0.5 • tg()=Vr/V  Vr V Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  11. Modeling Approach • 2 minimization of synthetic single-dish spectra • Gridded physical model + (constant) abundances • Molecular excitation using Monte Carlo approach • Synthetic spectra, convolved to appropriate resolution • 4+n free parameters • Flattening parameter f • Inclination i • Stellar mass M* • Velocity field direction angle  • Molecular Abundances Xi Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  12. Results Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  13. Results Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  14. Results Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  15. Results • Preliminary values • Stellar mass 1.1 M • Flattening parameter f=3.0 • Equivalent with h/R=0.35 • Inclination 70˚ • Velocity field angle =18˚ • Inspiral time approximately 105 yr • Significant fraction of embedded life time Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  16. Results • Abundances • C18O 4x10-7 (-> 12CO 2x10-4 no depletion) • CS 8x10-9 • SO 8x10-9 • H2CO 1x10-9 • HCO+ 4x10-8 • HCN 4x10-9 • HNC 2x10-9 • CN 2x10-9 • Dark cloud values; little depletion; HCO+ increased? Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  17. HCO+ 1–0 Interferometry Observations Model Prediction Surrounding cloud material Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  18. Enhanced-SMA Predictions SMA CSO JCMT Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  19. Enhanced-SMA Predictions HCO+ 4–3 at 0.3” (40 AU) Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  20. A break in the V-field at 300 AU HCO+ 4–3 at 0.3” (40 AU) Brinch, Hogerheijde, & Joergensen (in prep) Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

  21. Conclusion • L1489 IRS • Disklike rotating and infalling structure • Lifetime 105 yr, significant fraction of embedded phase • Chemical abundances • No evidence for depletion • HCO+ enhanced • Further high-resolution observations with, e.g., enhanced-SMA • Breaks in the velocity field on scales of T Tauri disks • Changes in the chemistry on scales of T Tauri disks Submillimeter Astronomy in the Era of the SMA • June 13–16 2005 • Cambridge MA

More Related