We present resolved images of the HR 4796A debris disk using the Magellan adaptive optics system paired with Clio-2 and VisAO. We detect the disk at 0.77 microns, 0.91 microns, 0.99 microns, 2.15 microns, 3.1 microns, 3.3 microns, and 3.8 microns. We find that the deprojected center of the ring is offset from the star by 4.76 ± 1.6 AU and that the deprojected eccentricity is 0.06 ± 0.02, in general agreement with previous studies. We find that the average width of the ring is 14+3-2% (11.1+2.4-1.6 AU), also comparable to previous measurements. Combining our new scattered light data with archival Hubble Space Telescope images at ~0.5-2 mum, along with previously unpublished Spitzer/MIPS thermal emission data and all other literature thermal data, we set out to constrain the chemical composition of the dust grains. After testing 19 individual root compositions and more than 8400 unique mixtures of these compositions, we find that good fits to the scattered light alone and thermal emission alone are discrepant, suggesting that caution should be exercised if fitting to only one or the other. When we fit to both data sets simultaneously, we find that silicates and organics are generally the most favored, while large abundances of water ice are usually not favored. These results suggest the HR 4796A dust grains are similar to interstellar dust and solar system comets, though improved modeling is necessary to place better constraints on the exact chemical composition of the dust.
- MagAO-X @ SPIE Astronomical Telescopes + Instrumentation 2018
- MagAO 2018 Day N: Still Not Home
- MagAO 2018A Day 18: All Packed Up
- MagAO 2018A Day 17: The Wrong End of a Telescope
- MagAO 2018A Day 16: Day 365
- MagAO 2018A Day 15: Fringe Science
- MagAO 2018A Day 14: Not just a phase
- MagAO 2018A Day 13: Moonglow
- MagAO 2018A Day 12: #LifeAtLCO
- MagAO 2018A Day 11: Here Comes the Sun
- MagAO 2018A Day 10: Back to Clouds
- MagAO 2018A Day 9: The Universe
- MagAO 2018A Day 8: She blinded me with 73 clouds
- MagAO 2018A Day 7: El cielo estaba nublado
- MagAO 2018A Day 6: The Return of Magellanicus
- MagAO 2018A Day 5: Cloudy Empire
- MagAO 2018A Day 4: Science Data!
- MagAO 2018A Day3: Closed-loop On Sky !
- MagAO 2018A Day 2: Shell Set w/ All 64 bits!
- MagAO 2018A Day 1: Surprise mystery guest
- MagAO 2018A Day 0: Cool Clio Code
- MagAO 2018A Day -1: Strike On The Way In
- MagAO 2018A Blog Rules
- Congratulations Dr. Wu — MagAO’s newest Ph.D.!
- Greetings from LBTI AO!
- 2017B Day 14: Not the last blog post
- 2017B Day 15: The End of the 2017B Run, and a Hike to See Petroglyphs
- 2017B Day 13: The Owl’s Perch
- 2017B Day 12: Arcseconds Chocolates Owls Earthquakes
- 2017B Day 11: MagAO Team Takes a Field Trip!