Phase-locked polarization by photospheric reflection in the semidetached eclipsing binary μ1 Sco

Cotton, Daniel V.; Bailey, Jeremy; Kedziora-Chudczer, Lucyna; Horta, A. Y. De

doi:10.1093/mnras/staa2053

Cited by 11 publications

(8 citation statements)

References 61 publications

(129 reference statements)

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“…Nonzero, telescope-induced polarization is a major systematic effect, and it is measurable even at straight Cassegrain focus. This well-documented effect, due to the incomplete cancellation of the polarization state of light generated by light rays across the telescope mirrors, tends to lie at the 100 ppm (0.01%) level or below (Hough et al 2006;Wiktorowicz & Matthews 2008;Lucas et al 2009;Wiktorowicz 2009;Berdyugina et al 2011;Bailey et al 2015Bailey et al , 2017Bailey et al , 2020Bott et al 2016;Cotton et al 2020a;Marshall et al 2020). For equatorial or yoke-mounted telescopes, where the orientation of the telescope pupil on the sky is static with respect to pointing, telescope polarization may be calibrated by observation of nearly unpolarized stars.…”

Section: Telescope and Sky Polarizationmentioning

confidence: 99%

A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter

Wiktorowicz

Słowikowska

Nofi

et al. 2023

ApJS

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The POLISH2 optical polarimeter has been in operation at the Lick Observatory 3 m Shane telescope since 2011, and it was commissioned at the Gemini North 8 m in 2016. This instrument primarily targets exoplanets, asteroids, and the Crab Pulsar, but it has also been used for a wide variety of planetary, galactic, and supernova science. POLISH2's photoelastic modulators, employed instead of rotating wave plates or ferroelectric liquid crystal modulators, offer the unprecedented ability to achieve sensitivity and accuracy of order 1 ppm (0.0001%), which are difficult to obtain with conventional polarimeters. Additionally, POLISH2 simultaneously measures the intensity (Stokes I), linear polarization (Stokes Q and U), and circular polarization (Stokes V), which fully describe the polarization state of incident light. We document our laboratory and on-sky calibration methodology and our archival on-sky database, and we demonstrate the conclusive detection of circular polarization of certain objects.

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Section: Telescope and Sky Polarizationmentioning

confidence: 99%

A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter

Wiktorowicz

Słowikowska

Nofi

et al. 2023

ApJS

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“…In addition to some of the most sensitive searches for exoplanets (Bott et al 2016(Bott et al , 2018 and studies of the polarisation in active dwarfs (Cotton et al 2017b(Cotton et al , 2019a, HIPPI has been successfully used for a range of science programs including surveys of polarisation in bright stars (Cotton et al 2016a), the first detection of polarisation due to rapid rotation in hot stars (Cotton et al 2017a); reflection from the photospheres of a binary star (Bailey et al 2019); studies of debris disc systems (Cotton et al 2017b;Marshall et al 2020), the interstellar medium (Cotton et al 2017b(Cotton et al , 2019b and hot dust (Marshall et al 2016). HIPPI-2 has recently been used in the study of reflected light in binary systems (Bailey et al 2019;Cotton et al 2020c), the rapidly rotating star 𝛼 Oph (Bailey et al 2020b), the red supergiant Betelgeuse (Cotton et al 2020a) and the polluted white dwarf G29-38 (Cotton et al 2020b).…”

Section: Expected Polarization Levelsmentioning

confidence: 99%

Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization

Bailey,

Bott,

Cotton

et al. 2021

Preprint

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We present high-precision linear polarization observations of four bright hot Jupiter systems (𝜏 Boo, HD 179949, HD 189733 and 51 Peg) and use the data to search for polarized reflected light from the planets. The data for 51 Peg are consistent with a reflected light polarization signal at about the level expected with 2.8𝜎 significance and a false alarm probability of 1.9 per cent. More data will be needed to confirm a detection of reflected light in this system. HD 189733 shows highly variable polarization that appears to be most likely the result of magnetic activity of the host star. This masks any polarization due to reflected light, but a polarization signal at the expected level of ∼20 ppm cannot be ruled out. 𝜏 Boo and HD 179949 show no evidence for polarization due to reflected light. The results are consistent with the idea that many hot Jupiters have low geometric albedos. Conclusive detection of polarized reflected light from hot Jupiters is likely to require further improvements in instrument sensitivity.

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“…HIPPI has been successfully used for a range of science programs including surveys of polarisation in bright stars (Cotton et al 2016a), the first detection of polarisation due to rapid rotation in hot stars (Cotton et al 2017a); reflection from the photospheres of binary stars (Bailey et al 2019) and the most sensitive searches for similar effects from exoplanets (Bott et al 2016(Bott et al , 2018; studies of the polarisation in active dwarfs (Cotton et al 2017b(Cotton et al , 2019b, debris discs (Cotton et al 2017b), the interstellar medium (Cotton et al 2017b(Cotton et al , 2019a and hot dust (Marshall et al 2016). HIPPI-2 has recently been used in the study of reflected light in binary systems (Bailey et al 2019;Cotton et al 2020a), the rapidly rotating system α Oph (Bailey et al 2020b), the red supergiant Betelgeuse (Cotton et al 2020b) and the polluted white dwarf G29-38 (Cotton et al 2020c). Mounted at the AAT f/8 Cassegrain focus, the HIPPI aperture has a diameter of 6.6 , such that the disc of HD 172555 lies fully within it (With HIPPI-2 an aperture corresponding to 11.9 was selected).…”

Section: Hippi/-2 Aperture Polarimetrymentioning

confidence: 99%

Polarimetric and radiative transfer modelling of HD 172555

Marshall

Cotton

Scicluna

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The debris disc around HD 172555 was recently imaged in near-infrared polarised scattered light by the Very Large Telescope’s Spectro-Polarimetric High-contrast Exoplanet REsearch instrument. Here we present optical aperture polarisation measurements of HD 172555 by the HIgh Precision Polarimetric Instrument (HIPPI), and its successor HIPPI-2 on the Anglo-Australian Telescope. We seek to refine constraints on the disc’s constituent dust grains by combining our polarimetric measurements with available infrared and millimetre photometry to model the scattered light and continuum emission from the disc. We model the disc using the 3D radiative transfer code Hyperion, assuming the orientation and extent of the disc as obtained from the SPHERE observation. After correction for the interstellar medium contribution, our multi-wavelength HIPPI/-2 observations (both magnitude and orientation) are consistent with the recent SPHERE polarisation measurement with a fractional polarisation p = 62.4 ± 5.2 ppm at 722.3 nm, and a position angle θ = 67 ± 3○. The multi-wavelength polarisation can be adequately replicated by compact, spherical dust grains (i.e. from Mie theory) that are around 1.2 μm in size, assuming astronomical silicate composition, or 3.9 μm assuming a composition derived from radiative transfer modelling of the disc. We were thus able to reproduce both the spatially resolved disc emission and polarisation with a single grain composition model and size distribution.

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Phase-locked polarization by photospheric reflection in the semidetached eclipsing binary μ1 Sco

Cited by 11 publications

References 61 publications

A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter

A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter

Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization

Polarimetric and radiative transfer modelling of HD 172555

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