Large Interstellar Polarisation Survey

Siebenmorgen, R.; Voshchinnikov, N.V.; Bagnulo, S.; Cox, N. L. J.; Cami, J.; Peest, Christian

doi:10.1051/0004-6361/201731814

Cited by 19 publications

(18 citation statements)

References 53 publications

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Section: A Observations and Systematicsmentioning

confidence: 99%

“…The total optical polarization along arbitrary lines of sight toward galactic field stars can range from a fraction of a percent to several percent [102][103][104]. Previous work from the Large Interstellar Polarization Survey provided evidence that interstellar polarization (ISP) from multiple dust clouds along a given line of sight is smaller than from lines of sight passing through a single dust cloud [104,105]. Since the presence of two or more clouds would therefore depolarize the incoming radiation, we assume that the ISP along the line of sight toward a galactic field star represents a conservative upper limit to the true ISP toward an AGN source that would have been measured through the full dust column of the galaxy, the intergalactic medium, and the AGN host galaxy.…”

Section: A Observations and Systematicsmentioning

confidence: 99%

See 1 more Smart Citation

Constraints on Lorentz invariance and CPT violation using optical photometry and polarimetry of active galaxies BL Lacertae and S5 B0716+714

et al. 2019

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Various quantum gravity approaches that extend beyond the standard model predict Lorentz Invariance and Charge-Parity-Time Violation at energies approaching the Planck scale. These models frequently predict a wavelength dependent speed of light, which would result in time delays between promptly emitted photons at different energies, as well as a wavelength-dependent rotation of the plane of linear polarization for photons resulting from vacuum birefringence. Here, we describe a pilot program with an automated system of small telescopes that can simultaneously conduct high cadence optical photometry and polarimetry of Active Galactic Nuclei (AGN) in multiple passbands. We use these observations as a proof-of-principle to demonstrate how such data can be used to test various Lorentz Violation models, including special cases of the Standard Model Extension (SME). In our initial campaign with this system, the Array Photo Polarimeter, we observed two AGN sources, including BL Lacertae at redshift z = 0.069, and S5 B0716+714 at z = 0.31. We demonstrate that optical polarimetry with a broadband Luminance filter combined with simultaneous Ic-band observations yields SME parameter constraints that are up to ∼10 and ∼30 times more sensitive than with a standard Ic-band filter, for SME models with mass dimension d = 5 and d = 6, respectively. Using only a small system of telescopes with an effective 0.45-m aperture, we further demonstrate d = 5 constraints for individual lines of sight that are within a factor of ∼1-10 in sensitivity to comparable constraints from optical polarimetry with a 3.6-m telescope. Such an approach could significantly improve existing SME constraints via a polarimetric all-sky survey of AGN with multiple 1-meter class telescopes.

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Section: A Observations and Systematicsmentioning

confidence: 99%

Section: A Observations and Systematicsmentioning

confidence: 99%

Constraints on Lorentz invariance and CPT violation using optical photometry and polarimetry of active galaxies BL Lacertae and S5 B0716+714

et al. 2019

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“…This was totally counter-intuitive regarding what we thought we knew about diffuse ISM dust. Indeed, for a given set of dust properties, the luminosity should increase with temperature whereas the opacity should remain constant, this means that dust already evolves in the diffuse ISM (see also Siebenmorgen et al 2018). This evolution was confirmed by further studies, showing for instance an increase in the dust opacity by around 40% when N H > 5 × 10 20 H/cm 2 , in parallel with very little variations in E(B − V )/N H (Nguyen et al 2018).…”

Section: Observational Constraints Vs Modelingmentioning

confidence: 58%

Dust evolution: Going beyond the empirical

Ysard

2019

Proc. IAU

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A key element when modeling dust in any astrophysical environment is a self-consistent treatment of the evolution of the dust material properties (size distribution, chemical composition and structure) as they react to and adjust to the local radiation field intensity and hardness and to the gas density and dynamics. The best way to achieve this goal is to anchore as many model parameters as possible to laboratory data. In this paper, I present two examples to illustrate how outstanding questions in dust modeling have been/are being moved forward by recent advances in laboratory astrophysics and what laboratory data are still needed to further advance dust evolution models.

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“…Fortunately, very few such processes are known to occur in the optical regime, and most are expected to average out over multiple lines of sight. A prominent example of such an effect includes the polarization and de-polarization of radiation by the interstellar medium [86,87].…”

Section: Discussionmentioning

confidence: 99%

New Constraints on Lorentz Invariance Violation from Combined Linear and Circular Optical Polarimetry of Extragalactic Sources

2021

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Expanding on our prior efforts to search for Lorentz invariance violation (LIV) using the linear optical polarimetry of extragalactic objects, we propose a new method that combines linear and circular polarization measurements. While existing work has focused on the tendency of LIV to reduce the linear polarization degree, this new method additionally takes into account the coupling between photon helicities induced by some models. This coupling can generate circular polarization as light propagates, even if there is no circular polarization at the source. Combining significant detections of linear polarization of light from extragalactic objects with the absence of the detection of circular polarization in most measurements results in significantly tighter constraints regarding LIV. The analysis was carried out in the framework of the Standard-Model Extension (SME), an effective field theory framework to describe the low-energy effects of an underlying fundamental quantum gravity theory. We evaluate the performance of our method by deriving constraints on the mass dimension d=4 CPT-even SME coefficients from a small set of archival circular and linear optical polarimetry constraints and compare them to similar constraints derived in previous works with far larger sample sizes and based on linear polarimetry only. The new method yielded constraints that are an order of magnitude tighter even for our modest sample size of 21 objects. Based on the demonstrated gain in constraining power from scarce circular data, we advocate for the need for future extragalactic circular polarization surveys.

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Large Interstellar Polarisation Survey

Cited by 19 publications

References 53 publications

Constraints on Lorentz invariance and CPT violation using optical photometry and polarimetry of active galaxies BL Lacertae and S5 B0716+714

Constraints on Lorentz invariance and CPT violation using optical photometry and polarimetry of active galaxies BL Lacertae and S5 B0716+714

Dust evolution: Going beyond the empirical

New Constraints on Lorentz Invariance Violation from Combined Linear and Circular Optical Polarimetry of Extragalactic Sources

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