Debris disks found around main sequence stars are the remnants of planetary formation. The outer colder parts of these disks, analogous to our solar system Kuiper belt, were first detected via their far infrared excess emission in the 80’s, and then abundantly imaged at visible to sub-millimeter wavelengths, most recently with SPITZER, Herschel and ALMA. Conversely, very little is known about the warmer dust component of debris disks, similar to the zodiacal dust residing in the inner 3AU of our own solar system. Only a handful of warm (> 200K) debris disks have been found around mature stars by Spitzer or spatially resolved by near/mid-infrared interferometry. However, this situation is changing rapidly, as illustrated by the many detections of resolved hot/warm excess around nearby main sequence stars by the CHARA and VLTI interferometric arrays (FLUOR, PIONIER and GRAVITY instruments) and at LBTI. Our JPL team is strongly engaged in 3 surveys which recently concluded: the NASA sponsored LBTI-HOSTS mid-infrared exozodi survey (Mennesson is a key science team member), the CHARA hot exozodi disks survey (funded through past NASA ROSES grant, PI: Mennesson) and the Palomar Fiber nuller near infrared hot exozodi survey (Mennesson served as science PI).
While at JPL, the postdoctoral fellow will have access to these complementary dataset acquired at different wavelengths and spatial resolutions. He will be invited to participate in their reduction, theoretical modeling and interpretation, both per individual target and in a statistical sense. The main objectives are: (i) to use and develop advanced models to reconcile all available data (including ancillary spectral measurements) and produce a consistent view of the observed disks morphology and physical characteristics; (ii) to gather, reduce and interpret new exozodiacal observational data using existing ground-based facilities (e.g. VLTI and CHARA); (iii) to understand the potential of exozodiacal disks visible observations with the WFIRST coronagraph instrument and other possible future space-based instruments; (iv) to understand the impact of current and future exozodiacal dust detections on the feasibility of possible future NASA direct imaging missions targeting habitable zone exoplanets such as HabEx and LUVOIR.
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