1 / 16

YARKOVSKY FOOTPRINTS IN THE EOS FAMILY

YARKOVSKY FOOTPRINTS IN THE EOS FAMILY. D. Vokrouhlick ý, M. Brož ( Charles Univ, Prague ), A. Morbidelli ( OCA, Nice ), W.F. Bottke, D. Nesvorný ( SwRI, Boulder ), D. Lazzaro ( Nat Observatory, Rio de Janeiro ) and A. Rivkin ( MIT, Boston ).

yeo-fernandez
Download Presentation

YARKOVSKY FOOTPRINTS IN THE EOS FAMILY

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. YARKOVSKY FOOTPRINTS IN THE EOS FAMILY D. Vokrouhlický, M. Brož (Charles Univ, Prague), A. Morbidelli (OCA, Nice), W.F. Bottke, D. Nesvorný (SwRI, Boulder), D. Lazzaro (Nat Observatory, Rio de Janeiro) and A. Rivkin(MIT, Boston) Classical vs extended model of the asteroid families: Time AGE Karin, … Eos, Koronis, Themis, …

  2. 4 lines of evidence for the ongoing long-term evolution driven by the Yarkovsky effect in the Eos family: • Sharp boundary at the 7/3 resonance; • Asymmetry wrt the 9/4 resonance and bodies inside the • 9/4 resonance; • Characteristic shape of the family in the a-H projection; • Overabundance of asteroids in the z1secular resonance • at low inclination and eccentricity.

  3. 1. Sharp boundary at the 7/3 resonance Eos @ 60m/s; 3028 asteroids Eos familyidentified by the Hierarchical Clustering Method using the new database of proper elements for 106,000 numbered and multiopposition asteroids (data from AstDys, http://newton.dm.unipi.it by Knežević and Milani)

  4. 2. Asymmetry wrt the 9/4 resonance and… Our model assumes the bulk of family formed on the left side of the 9/4 resonance; the Yarkovsky effect constantly pushes new bodies TOWARDS the resonance… MODEL the relative family population observed on the right side of the resonance matches the expected probability to CROSS the resonance for different values of H…

  5. 3. Characteristic shape in the a-H projection… Size H ~ -log(Size)

  6. 3. Characteristic shape in the a-H projection… Our model well matches the family boundary for H>10; the conjectured age is ~ 2.1 Gy SizeH MODEL

  7. 3. Characteristic shape in the a-H projection… Sources: http://smass.mit.edu, http://pdssbn.astro.umd.edu/, Doressoundiram et al. (1998)

  8. 3. Characteristic shape in the a-H projection… Observations: D. Lazzaro and A. Rivkin

  9. 4. Asteroids in the z1 secular resonance… Eos family is crossed by the secular resonance z1=g+s-g 6-s 6; the family at small value of e and I seems to consist of bodies uniquely in this resonance.

  10. 4. Asteroids in the z1 secular resonance… z1 MODEL Numerical simulation confirms that Yarkovsky-drifting bodies are trapped by the z1 resonance and form a stream out of the family…

  11. 2. Asymmetry wrt the 9/4 resonance and… Significant deficiency of asteroids above the 9/4 resonance… Asymmetry of the small asteroid distribution as compared to the larger asteroid distribution…

  12. 3. Characteristic shape in the a-H projection… Size H ~ -log(Size)

  13. 4. Asteroids in the z1 secular resonance… Observations: A. Rivkin

  14. 4. Asteroids in the z1 secular resonance… Observations: A. Rivkin

  15. 4. Asteroids in the z1 secular resonance…

More Related