The exozodiacal dust problem for direct observations of exo-earths

Aki Roberge, Christine H. Chen, Rafael Millan-Gabet, Alycia J. Weinberger, Philip M Hinz, Karl R. Stapelfeldt, Olivier Absil, Marc J. Kuchner, Geoffrey Bryden

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Debris dust in the habitable zones of stars-otherwise known as exozodiacal dust-comes from extrasolar asteroids and comets and is thus an expected part of a planetary system. Background flux from the solar system's zodiacal dust and the exozodiacal dust in the target system is likely to be the largest source of astrophysical noise in direct observations of terrestrial planets in the habitable zones of nearby stars. Furthermore, dust structures like clumps, thought to be produced by dynamical interactions with exoplanets, are a possible source of confusion. In this article, we qualitatively assess the primary impact of exozodiacal dust on high-contrast direct imaging at optical wavelengths, such as would be performed with a coronagraph. Then we present the sensitivity of previous, current, and near-term facilities to thermal emission from debris dust at all distances from nearby solar-type stars, as well as our current knowledge of dust levels from recent surveys. Finally, we address the other method of detecting debris dust, through high-contrast imaging in scattered light. This method is currently far less sensitive than thermal emission observations, but provides high spatial resolution for studying dust structures. This article represents the first report of NASA's Exoplanet Exploration Program Analysis Group (ExoPAG).

Original languageEnglish (US)
Pages (from-to)799-808
Number of pages10
JournalPublications of the Astronomical Society of the Pacific
Volume124
Issue number918
DOIs
Publication statusPublished - Aug 2012

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ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Roberge, A., Chen, C. H., Millan-Gabet, R., Weinberger, A. J., Hinz, P. M., Stapelfeldt, K. R., ... Bryden, G. (2012). The exozodiacal dust problem for direct observations of exo-earths. Publications of the Astronomical Society of the Pacific, 124(918), 799-808. https://doi.org/10.1086/667218