Impact of hot exozodiacal dust on the polarimetric analysis of close-in exoplanets

Abstract

Hot exozodiacal dust (HEZD) found around main-sequence stars through interferometric observations in the photometric bands H to L is located close to the dust sublimation radius, potentially at orbital radii comparable to those of close-in exoplanets. Consequently, HEZD has a potential influence on the analysis of the scattered-light polarization of close-in exoplanets and vice versa. We analyze the impact of HEZD on the polarimetric characterization of close-in exoplanets. This study is motivated in particular by the recently proven feasibility of exoplanet polarimetry. Applying the 3D Monte Carlo radiative transfer code POLARIS in an extended and optimized version for radiative transfer in exoplanetary atmospheres and an analytical tool for modeling the HEZD, we simulated and compared the polarization characteristics of the wavelength-dependent scattered-light polarization of HEZD and close-in exoplanets. The varied parameters are the planetary phase angle ($0^{\circ }-180^{\circ }$), the dust grain radius ($0.02\mu$m $-10\mu$m), the HEZD mass ($10^{-10}$${\mathrm{M}}_{\oplus }$ $-10^{-8}$${\mathrm{M}}_{\oplus }$), the orbital inclination ($0^{\circ }-90^{\circ }$), the composition of the planetary atmosphere (Mie and Rayleigh scattering atmosphere), the orbital radius of the HEZD ($0.02$ au $-0.4$ au), and the planetary orbital radius ($0.01$ au $-0.05$ au). The dust grain radius has the strongest influence on the polarimetric analysis due to its significant impact on the wavelength-dependent polarization characteristics and the total order of magnitude of the scattered-light polarization. In certain scenarios, the scattered-light polarization of the HEZD even exceeds that of the close-in exoplanet.

arXiv commentAccepted for publication in Astronomy \& Astrophysics. 14 pages, 13 figures

References in corpus (52)

• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• Transience of hot dust around sun-like stars
• Photometric Light Curves and Polarization of Close-in Extrasolar Giant Planets
• The HARPS search for Earth-like planets in the habitable zone: I -- Very low-mass planets around HD20794, HD85512 and HD192310
• HST hot-Jupiter transmission spectral survey: detection of potassium in WASP-31b along with a cloud deck and Rayleigh scattering
• Transmission spectral properties of clouds for hot Jupiter exoplanets
• Radiative transfer with POLARIS: I. Analysis of magnetic fields through synthetic dust continuum polarization measurements
• Mie Scattering by Ensembles of Particles with Very Large Size Parameters
• Imaging Polarimetric Observations of a New Circumstellar Disk System
• Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
• Hot Jupiters: Origins, Structure, Atmospheres
• A near-infrared interferometric survey of debris disc stars. III. First statistics based on 42 stars observed with CHARA/FLUOR
• Exo--Zodiacal Dust Levels for Nearby Main Sequence Stars
• VLT/NACO Polarimetric Differential Imaging of HD100546 - Disk Structure and Dust Grain Properties between 10-140 AU
• A near-infrared interferometric survey of debris-disc stars. IV. An unbiased sample of 92 southern stars observed in H-band with VLTI/PIONIER
• Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
• Color difference makes a difference: four planet candidates around tau Ceti
• The Exozodiacal Dust Problem for Direct Observations of ExoEarths
• Optimizing spectroscopic follow-up strategies for supernova photometric classification with active learning
• Characterizing exoplanetary atmospheres through infrared polarimetry
• An interferometric study of the Fomalhaut inner debris disk. III. Detailed models of the exozodiacal disk and its origin
• Sparkling nights and very hot days on WASP-18b: the formation of clouds and the emergence of an ionosphere
• A near-infrared interferometric survey of debris-disc stars. V. PIONIER search for variability
• A high-sensitivity polarimeter using a ferro-electric liquid crystal modulator
• A grid of polarization models for Rayleigh scattering planetary atmospheres
• Post conjunction detection of $\beta$ Pictoris b with VLT/SPHERE
• Dust in the inner regions of debris disks around A stars
• Inner mean-motion resonances with eccentric planets: A possible origin for exozodiacal dust clouds
• Polarization measurements of hot dust stars and the local interstellar medium
• Detecting Life-bearing Extra-solar Planets with Space Telescopes
• The polarisation of HD 189733
• HIPPI-2: A Versatile High Precision Polarimeter
• Simultaneous Linear and Circular Optical Polarimetry of Asteroid (4) Vesta
• The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
• Polarized Radiative Transfer in Planetary Atmospheres and the Polarization of Exoplanets
• Dust size and spatial distributions in debris discs: predictions for exozodiacal dust dragged in from an exo-Kuiper belt
• Gas trapping of hot dust around main-sequence stars
• A near-infrared interferometric survey of debris-disk stars. VII. The hot/warm dust connection
• Hot exozodiacal dust: an exocometary origin?
• The polarization of the planet-hosting WASP-18 system
• Hot Grain Dynamics by Electric Charging and Magnetic Trapping in Debris Disks
• Disentangling planetary and stellar activity features in the CoRoT-2 light curve
• Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
• Impact of planetesimal eccentricities and material strength on the appearance of eccentric debris disks
• Hot exozodis: cometary supply without trapping is unlikely to be the mechanism
• First L band detection of hot exozodiacal dust with VLTI/MATISSE
• Three-dimensional continuum radiative transfer of polarized radiation in exoplanetary atmospheres
• Modelling of mid-infrared interferometric signature of hot exozodiacal dust emission
• Polarimetric investigation of selected cloud compositions in exoplanetary atmospheres
• Secondary eclipses of WASP-18b -- Near Infrared observations with the Anglo Australian Telescope, the Magellan Clay Telescope and the LCOGT network
• Multi-wavelength aperture polarimetry of debris disc host stars
• How much large dust could be present in hot exozodiacal dust systems?

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