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Communication Dans Un Congrès Année : 2014

Is the HD 15115 circumstellar disk really asymmetrical?

Résumé

Similarly to beta Pictoris, HD 15115 is a young and nearby (45.2 pc) star that hosts a debris disk. This debris disk was first imaged in 2007 (Kalas et al., 2007) in visible using HST and in H band using the Keck observatory. The disk appeared edge-on and showed an asymmetry between its west and east parts. This detection was later observed in J band using HST / Nicmos data (Debes et al., 2008) and in Ks and L' using LBT (Rodigas et al. 2012). These observations confirmed the asymmetric nature of HD 15115 debris disk. We present here the results of the analysis of data from the Gemini / NICI archival system from 2009 and 2011 in H and K bands. We use newly developed differential treatment algorithms on these data (ADI, LOCI, KLIP) to subtract the light of the star and image the disk up to 1 arc second (30 AU). From this analysis, we find an inclination of 86 (confirming previous conclusions about HD 15115). We derive the disk position angle and spine and photometry and only find a brightness asymmetry in these elements. We also present evidence of an ring at 2 arc seconds (60 AU), with a rather sharp inner edge, and no sign of an asymmetry. With this radius and inclination, we create disk models (Augereau et al. 1999) and put constraints on the disk parameters, using either the position angle, spine and photometry or forward modeling.
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Dates et versions

hal-03734045 , version 1 (21-07-2022)

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J. Mazoyer, Anthony Boccaletti, Jean-Charles Augereau, Anne-Marie Lagrange, Raphaël Galicher, et al.. Is the HD 15115 circumstellar disk really asymmetrical?. Thirty years of Beta Pic and Debris Disks Studies, Sep 2014, Paris, France, France. ⟨hal-03734045⟩
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