| Title: |
Probing the Inner Disk Emission of the Herbig Ae Stars HD 163296 and HD 190073. |
| Authors: |
Benjamin R. Setterholm, John D. Monnier, Claire L. Davies, Alexander Kreplin, Stefan Kraus, Fabien Baron, Alicia Aarnio, Jean-Philippe Berger, Nuria Calvet, Michel Curé, Samer Kanaan, Brian Kloppenborg, Jean-Baptiste Le Bouquin, Rafael Millan-Gabet, Adam E. Rubinstein, Michael L. Sitko, Judit Sturmann, Theo A. ten Brummelaar, Yamina Touhami |
| Source: |
Astrophysical Journal; 12/20/2018, Vol. 869 Issue 2, p1-1, 1p |
| Subject Terms: |
PROTOPLANETARY disks, ACCRETION (Astrophysics), PLANETESIMALS, SURFACE brightness (Astronomy), ASTRONOMICAL photometry |
| Abstract: |
The physical processes occurring within the inner few astronomical units of protoplanetary disks surrounding Herbig Ae stars are crucial to setting the environment in which the outer planet-forming disk evolves and put critical constraints on the processes of accretion and planet migration. We present the most complete published sample of high angular resolution H- and K-band observations of the stars HD 163296 and HD 190073, including 30 previously unpublished nights of observations of the former and 45 nights of the latter with the CHARA long-baseline interferometer, in addition to archival VLTI data. We confirm previous observations suggesting that significant near-infrared emission originates within the putative dust evaporation front of HD 163296 and show that this is the case for HD 190073 as well. The H- and K-band sizes are the same within (3 ± 3)% for HD 163296 and within (6 ± 10)% for HD 190073. The radial surface brightness profiles for both disks are remarkably Gaussian-like with little or no sign of the sharp edge expected for a dust evaporation front. Coupled with spectral energy distribution analysis, our direct measurements of the stellar flux component at the H and K bands suggest that HD 190073 is much younger (<400 kyr) and more massive (∼5.6 M⊙) than previously thought, mainly as a consequence of the new Gaia distance (891 pc). [ABSTRACT FROM AUTHOR] |
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| Database: |
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