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The Potential of Exozodiacal Disks Observations with the WFIRST Coronagraph Instrument

Mennesson, Bertrand and Akeson, R. and Armus, L. and Berriman, B. and Calchi Novati, S. and Gelino, C. and Gelino, D. and Helou, G. and Laine, S. and Lowrance, P. and Meshkat, T. and Paladini, R. and Ramirez, S. and Ygouf, M. (2019) The Potential of Exozodiacal Disks Observations with the WFIRST Coronagraph Instrument. . (Unpublished)

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The Wide Field Infrared Survey Telescope (WFIRST) Coronagraph Instrument (CGI) will be the first high-performance stellar coronagraph using active wavefront control for deep starlight suppression in space, providing unprecedented levels of contrast, spatial resolution, and sensitivity for astronomical observations in the optical. One science case enabled by the CGI will be taking images and(R~50)spectra of faint interplanetary dust structures present in the habitable zone of nearby sunlike stars (~10 pc) and within the snow-line of more distant ones(~20pc), down to dust density levels commensurate with that of the solar system zodiacal cloud. Reaching contrast levels below~10-7 for the first time, CGI will cross an important threshold in debris disks physics, accessing disks with low enough optical depths that their structure is dominated by transport phenomena than collisions. Hence, CGI results will be crucial for determining how exozodiacal dust grains are produced and transported in low-density disks around mature stars. Additionally, CGI will be able to measure the brightness level and constrain the degree of asymmetry of exozodiacal clouds around individual nearby sunlike stars in the optical, at the ~10x solar zodiacal emission level. This information will be extremely valuable for optimizing the observational strategy of possible future exo-Earth direct imaging missions, especially those planning to operate at optical wavelengths, such as Habitable Exoplanet Observatory (HabEx) and the Large Ultraviolet/Optical/Infrared Surveyor (LUVOIR).

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Mennesson, Bertrand0000-0003-4205-4800
Akeson, R.0000-0001-9674-1564
Armus, L.0000-0003-3498-2973
Berriman, B.0000-0001-8388-534X
Calchi Novati, S.0000-0002-7669-1069
Gelino, D.0000-0003-1274-2784
Helou, G.0000-0003-3367-3415
Laine, S.0000-0003-1250-8314
Lowrance, P.0000-0001-8014-0270
Meshkat, T.0000-0001-6126-2467
Paladini, R.0000-0002-5158-243X
Ygouf, M.0000-0001-7591-2731
Additional Information:Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Record Number:CaltechAUTHORS:20191002-085537714
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99004
Deposited By: Tony Diaz
Deposited On:02 Oct 2019 16:06
Last Modified:13 Nov 2019 23:08

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